{"id":6889,"date":"2025-02-20T12:34:25","date_gmt":"2025-02-20T12:34:25","guid":{"rendered":"https:\/\/osencmag.com\/?p=6889"},"modified":"2025-05-27T03:30:22","modified_gmt":"2025-05-27T03:30:22","slug":"hydrogen-decrepitation-in-the-production-of-ndfeb-magnets","status":"publish","type":"post","link":"https:\/\/osencmag.com\/fr\/blog\/hydrogen-decrepitation-in-the-production-of-ndfeb-magnets\/","title":{"rendered":"D\u00e9crepitation de l'hydrog\u00e8ne dans la production d'aimants NdFeB."},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6889\" class=\"elementor elementor-6889\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<nav class=\"elementor-section elementor-top-section elementor-element elementor-element-7a95e81e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7a95e81e\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;sticky&quot;:&quot;top&quot;,&quot;sticky_on&quot;:[&quot;desktop&quot;,&quot;tablet&quot;,&quot;mobile&quot;],&quot;sticky_offset&quot;:0,&quot;sticky_effects_offset&quot;:0,&quot;sticky_anchor_link_offset&quot;:0}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-39b699fa\" data-id=\"39b699fa\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-1e1af961 elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1e1af961\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-30d37077\" data-id=\"30d37077\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-79f7308 elementor-widget elementor-widget-text-editor\" data-id=\"79f7308\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"#Decrepitation\">Hydrogen Decrepitation During Neodymium Magnet Production.<\/a><\/li><li><a href=\"#vs\">Hydrogen Decrepitation vs Traditional Powder Metallurgy.<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-1907a4b7\" data-id=\"1907a4b7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-49c41443 elementor-widget elementor-widget-text-editor\" data-id=\"49c41443\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"#Production\">Implementing Hydrogen Decrepitation in NdFeB Magnet Production.<\/a><\/li><li><a href=\"#faq\">FAQ.<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/nav>\n\t\t\t\t<article class=\"elementor-section elementor-top-section elementor-element elementor-element-32cfb68e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"32cfb68e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2b5a063c\" data-id=\"2b5a063c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-360fc9c8 elementor-widget elementor-widget-text-editor\" data-id=\"360fc9c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In the field of modern magnet manufacturing, the efficiency and performance of NdFeB (neodymium iron boron) magnets are self-evident. The reason for the strong magnetic field of neodymium magnets is not only its raw materials, but also the manufacturing process. The powder making process is very important. Traditional powder metallurgy methods have certain limitations in terms of efficiency, material properties and environmental issues.<br \/>Hydrogen explosion is a technology that uses hydrogen to decompose rare earth metal alloys as a means to enhance refining and final products in magnet manufacturing. Hydrogen explosion does not affect the quality of raw materials and can improve the particle size of magnetic powders. Today, I will take you to take a look at the principle of hydrogen explosion and its advantages over traditional powder metallurgy.<\/p><figure id=\"attachment_6884\" aria-describedby=\"caption-attachment-6884\" style=\"width: 700px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-6884\" src=\"https:\/\/osencmag.com\/wp-content\/uploads\/2025\/02\/Principle-of-hydrogen-decrepitation.webp\" alt=\"Principle of hydrogen decrepitation\" width=\"700\" height=\"350\" srcset=\"https:\/\/osencmag.com\/wp-content\/uploads\/2025\/02\/Principle-of-hydrogen-decrepitation.webp 700w, https:\/\/osencmag.com\/wp-content\/uploads\/2025\/02\/Principle-of-hydrogen-decrepitation-600x300.webp 600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption id=\"caption-attachment-6884\" class=\"wp-caption-text\">Principle of hydrogen decrepitation<\/figcaption><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65e8244d elementor-widget elementor-widget-heading\" data-id=\"65e8244d\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"Decrepitation\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Hydrogen Decrepitation During Neodymium Magnet Production<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-47161b85 elementor-widget elementor-widget-text-editor\" data-id=\"47161b85\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Hydrogen Decrepitation (HD) plays an important role in the production of NdFeB magnets, especially in the production of high-performance magnets for electric motors, wind turbines and various electronic applications. This step involves the introduction of hydrogen into the rare earth alloy (neodymium-rich phase and <\/span><span style=\"font-weight: 400;\">Nd<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">Fe<\/span><span style=\"font-weight: 400;\">14<\/span><span style=\"font-weight: 400;\">B<\/span><span style=\"font-weight: 400;\"> grain matrix) to produce a series of physical changes. By producing the fine powder necessary for subsequent magnet manufacturing steps, the material and production methods are simplified.<\/span><\/p><p><span style=\"font-weight: 400;\">The process begins by subjecting the solid NdFeB alloy to a hydrogen-rich environment at temperatures between 25-400 \u00b0C. As hydrogen diffuses into the metal lattice, when the volume change (\u0394V) at the grain boundaries is 3 times the grain change, the lattice strain causes the magnet to burst and form microcracks. These cracks reduce the structural integrity of the alloy, making it brittle and easily broken into fine powders (particle sizes can reach the 6-600 \u03bcm range after hydrogenation). The generation of these fine powders is critical to the subsequent jet milling and jet milling processes that are essential to refine the material to the particle size required for efficient magnet production.<\/span><\/p><p><span style=\"font-weight: 400;\">In addition, performing the Hydrogen Decrepitation process on NdFeB alloy does not simply decompose the material into fine powder. The brittleness of the material after hydrogenation helps improve the efficiency of the subsequent pressing process. Because by promoting hydrogen decomposition, the energy required for subsequent mechanical processes can be effectively reduced, thereby improving the overall sustainability and cost-effectiveness of NdFeB magnet manufacturing. Compared with traditional powder metallurgy, this process greatly reduces material waste and can reduce production costs by 25% (<\/span><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acsomega.3c00299#fig7\" rel=\"nofollow noopener\" target=\"_blank\"><span style=\"font-weight: 400;\">Cited from ACS<\/span><\/a><span style=\"font-weight: 400;\">). Also, from an environmental perspective: Hydrogen Decrepitation is a more environmentally friendly alternative, as traditional methods often involve high energy consumption and produce large amounts of waste.<\/span><\/p><figure id=\"attachment_6885\" aria-describedby=\"caption-attachment-6885\" style=\"width: 529px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"size-full wp-image-6885\" src=\"https:\/\/osencmag.com\/wp-content\/uploads\/2025\/02\/Nd2Fe14B-grain-after-hydrogenation.webp\" alt=\"Nd2Fe14B grain after hydrogenation\" width=\"529\" height=\"312\" \/><figcaption id=\"caption-attachment-6885\" class=\"wp-caption-text\">Nd2Fe14B grain after hydrogenation<\/figcaption><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c93dacf elementor-widget elementor-widget-heading\" data-id=\"c93dacf\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"vs\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Hydrogen Decrepitation vs Traditional Powder Metallurgy<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e46224b elementor-widget elementor-widget-text-editor\" data-id=\"e46224b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">HD (Hydrogen Decrepitation) and\u2002PM (Powder Metallurgy) are also techniques with different methodologies and material applications used in metal powder manufacturing. Whereas hydrogen decrepitation employs hydrogen absorption to generate fractured metal powders, powder metallurgy\u2002(PM) generally harnesses methods such as grinding and crushing to produce powders. Thus, a fundamental difference between these processes lies in\u2002the mechanism by which the powder used to create the final magnets is produced.<\/span><\/p><p><strong>Traditional Powder Metallurgy (PM):<br \/><\/strong><span style=\"font-weight: 400;\">A conventional method\u2002for magnet manufacturing uses Powder Metallurgy (PM) which encompasses grinding and crushing techniques. One such method is to crush solid metals into powdery substances, which perform a pivotal role in the process\u2002of high-performance magnetic materials. Despite the frequent mention\u2002of atomization in PM, it is not typically applied to magnetic powders. Process techniques are primarily chosen for the production\u2002of magnets, as these techniques lead to materials with a defined particle size and homogeneity suitable for the magnet production process. As far as we know, PM can cover a wide variety of materials, even ferrous\u2002alloys, which are critical to the construction of permanent magnets. This adaptability allows PM to be well optimized for large-scale magnet manufacturing, particularly for growing sectors, such\u2002as automotive, electronics and renewable energy.<\/span><\/p><p>While both Hydrogen Decrepitation and Powder Metallurgy can be used for the same goal of producing permanent magnetic powders, there are clear differences in results and applications as well as material suitability.<\/p><p><img decoding=\"async\" class=\"size-full wp-image-6886\" src=\"https:\/\/osencmag.com\/wp-content\/uploads\/2025\/02\/Hydrogen-decrepitation-changes.webp\" alt=\"Hydrogen decrepitation changes\" width=\"550\" height=\"260\" \/><\/p><h3>Process Differences<\/h3><p><span style=\"font-weight: 400;\">Hydrogen Decrepitation\u2002(HD) makes metals such as iron or steel brittle at high temperatures with hydrogen gas, causing them to break into fine pieces. This process generates powders with a controlled particle size distribution that may be necessary to obtain\u2002magnets with specific magnetic properties. It focuses on hydrogen absorption causing fragmentation of the metal which can then be collected and\u2002purified. This approach is useful to achieve controlled and fine grains, especially\u2002for applications in magnet production.<\/span><\/p><p><span style=\"font-weight: 400;\">Unlike The Traditional Powder Metallurgy (PM) method for magnet production, which involves grinding or crushing\u2002metals into powders. These methods are excellent for producing magnetic\u2002powders, considering both specific particle size distribution and specific composition of magnetic materials, and they can be optimized to produce powders that meet the demanding requirements associated with magnet production. PM process is flexible enough to\u2002make magnets with the different necessary properties.<\/span><\/p><h3>Material Suitability<\/h3><p><span style=\"font-weight: 400;\">Hydrogen Decrepitation is mainly suitable for metals\u2002which are absorptive to hydrogen without losing crystalline structure i.e. for ferrous alloys and hard metals like tungsten. The use of HD\u2002in manufacturing magnets is restricted by this tailored material requirement, as not all metals can be processed through HD.<\/span><\/p><p><span style=\"font-weight: 400;\">On the other hand, Traditional Powder Metallurgy can be applied to a wide range of materials, including both ferrous and non-ferrous metals and specialized alloys. PM being more versatile and widely used in magnet manufacturing\u2002techniques enables manufacturers to select materials according to specific magnetic requirement.<\/span><\/p><h3>Powder Characteristics<\/h3><p><span style=\"font-weight: 400;\">Thanks to its highly effective methods, HD is ideally suited to\u2002the production of very fine powders. It has a narrow particle size\u2002distribution, making it suitable for high-precision applications such as cutting tools or high-performance alloys. In this case, the homogeneity of the powder produced by HD is better than that of normal\u2002powder, a characteristic that is important because sintering is involved. Actually, compared to magnets prepared from common-milled powder (average particle size of about 40\u03bcm), the magnets constructed from hydrogen decrepitated powder (average particle size of around 100\u03bcm)\u2002showed changed <a class=\"wpil_keyword_link\" href=\"https:\/\/osencmag.com\/blog\/demagnetization-factors-and-how-to-avoid-it\/\" target=\"_blank\" rel=\"noopener\" title=\"demagnetization\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"871\">demagnetization<\/a> loops, enhanced intrinsic coercivities and elevated temperature stability.<\/span><\/p><p><span style=\"font-weight: 400;\">In contrast, conventional PM may result in powder with a\u2002larger span of particle sizes, which can be advantageous in some instances. Nevertheless, powders made with conventional PM typically show a lower level of\u2002uniformity than those treated by HD.<\/span><\/p><p><strong>Advantages of Hydrogen Decrepitation<\/strong><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Fine Powder with High Uniformity: T<\/b><span style=\"font-weight: 400;\">he hydrogen decrepitation method is especially beneficial when the particle size distribution is narrow and uniform. In the case of producing magnets, uniformity of\u2002powdered material is very important given that during the process of replacing the material, sintering improves the magnetic property owing to enhanced domain alignment.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Enhanced Magnetic Performance:<\/b><span style=\"font-weight: 400;\"> Because HD is\u2002available as a fine, homogenous powder, it enables a better control of the magnetic properties of the magnet. This increases the energy density and efficiency in high-drain applications like\u2002motors, renewable energy systems, and electronics.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Material Efficiency:<\/b><span style=\"font-weight: 400;\"> The HD\u2002process uses less material in production. Thanks to the material loss is lower than\u2002with conventional methods due to the controlled fracturing of the metal and an efficient powder collection.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Environmental Benefits:<\/b><span style=\"font-weight: 400;\"> Hydrogen decrepitation is considered more environmentally friendly than traditional powder metallurgy, as it can reduce emissions and energy consumption during the production process.<\/span><\/li><\/ul><p><b>Advantages of Powder Metallurgy<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Versatility<\/b><span style=\"font-weight: 400;\">: PM is far more versatile and can be used on a greater variety of metals,\u2002including both ferrous and non-ferrous. This versatility makes\u2002it perfect for part production across numerous industries.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cost-Effectiveness<\/b><span style=\"font-weight: 400;\">: With well-established processes such as atomization and\u2002mechanical grinding, PM is usually more cost-effective and scalable for high-volume production.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Lower Energy Costs<\/b><span style=\"font-weight: 400;\">: Certain PM processes, such as gas atomization, are less energy demanding than HD\u2002and cheaper in some instances.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Hydrogen Decrepitation and Traditional Powder Metallurgy advantages\/pros and cons of process selection vary on material selection as well\u2002as product requirement. HD is well suited\u2002for fine, homogeneous powders to meet the demands of Advanced applications in select alloys. On the other side, Traditional PM is widely accepted among different fields as it covers a more diverse aspect of\u2002material and applications having the largest range of flexibility. It solves the expensive problem of\u2002having a larger range of particle sizes for select use as they are necessary in certain applications, thus making it a good fit for the industry, where such flexibility is essential.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1416cb elementor-widget elementor-widget-heading\" data-id=\"d1416cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Quick Comparison Table of Differences Between Hydrogen Decrepitation vs. Traditional Powder Metallurgy<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f5f0c1a elementor-widget elementor-widget-text-editor\" data-id=\"f5f0c1a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table><tbody><tr><th><b>Aspect<\/b><\/th><th><b>Hydrogen Decrepitation (HD)<\/b><\/th><th><b>Traditional Powder Metallurgy (PM)<\/b><\/th><\/tr><tr><th><b>Process<\/b><\/th><td><span style=\"font-weight: 400;\">Involves hydrogen absorption at elevated temperatures, making the metal brittle, which causes it to fracture into fine powder.<\/span><\/td><td><span style=\"font-weight: 400;\">Includes methods like atomization, mechanical grinding, and chemical reduction to create metal powders.<\/span><\/td><\/tr><tr><th><b>Material Suitability<\/b><\/th><td><span style=\"font-weight: 400;\">Limited to metals and alloys that can absorb hydrogen, such as certain ferrous alloys and hard metals (e.g., tungsten).<\/span><\/td><td><span style=\"font-weight: 400;\">Works with a broad range of metals, including ferrous, non-ferrous, and specialized alloys.<\/span><\/td><\/tr><tr><th><b>Powder Characteristics<\/b><\/th><td><span style=\"font-weight: 400;\">Produces fine powders with a narrow particle size distribution, ideal for precision applications.<\/span><\/td><td><span style=\"font-weight: 400;\">Can produce powders with a wider range of particle sizes and shapes, depending on the method used.<\/span><\/td><\/tr><tr><th><b>Flexibility<\/b><\/th><td><span style=\"font-weight: 400;\">More specialized and limited to specific alloys.<\/span><\/td><td><span style=\"font-weight: 400;\">Highly versatile, can be applied to a wide variety of materials and industries.<\/span><\/td><\/tr><tr><th><b>Applications<\/b><\/th><td><span style=\"font-weight: 400;\">Primarily used for high-performance materials like cutting tools, wear-resistant components, and magnetic materials.<\/span><\/td><td><span style=\"font-weight: 400;\">Used across various industries including automotive, aerospace, and electronics for producing parts like gears, bearings, and structural components.<\/span><\/td><\/tr><tr><th><b>Energy Requirements<\/b><\/th><td><span style=\"font-weight: 400;\">Generally more energy-intensive due to the hydrogen absorption process.<\/span><\/td><td><span style=\"font-weight: 400;\">Energy requirements vary, but atomization methods are typically less energy-intensive than HD.<\/span><\/td><\/tr><tr><th><b>Cost<\/b><\/th><td><span style=\"font-weight: 400;\">More complex and can be costlier due to hydrogen removal and specialized requirements.<\/span><\/td><td><span style=\"font-weight: 400;\">Generally more cost-effective, especially for large-scale production, due to well-established methods.<\/span><\/td><\/tr><tr><th><b>Powder Uniformity<\/b><\/th><td><span style=\"font-weight: 400;\">Produces highly uniform and fine powders.<\/span><\/td><td><span style=\"font-weight: 400;\">Powders can have a broader size distribution, with more variation in particle shapes and sizes.<\/span><\/td><\/tr><\/tbody><\/table><p>Hydrogen Decrepitation is an innovative technology for manufacturing high-performance NdFeB magnets. This method can achieve optimal material utilization, fine and uniform powder production and excellent magnetic properties. Oscenmag specializes in customizing strong magnetic <a class=\"wpil_keyword_link\" href=\"https:\/\/osencmag.com\/blog\/comparison-of-neodymium-and-ferrite-magnets\/\" target=\"_blank\" rel=\"noopener\" title=\"neodymium magnets\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"708\">neodymium magnets<\/a> to meet the unique high performance and stable magnetic needs of customers in industries such as motors, automobiles, aerospace and renewable energy. <a class=\"wpil_keyword_link\" href=\"https:\/\/osencmag.com\/why-choose-osencmag\/\" target=\"_blank\" rel=\"noopener\" title=\"We\" data-wpil-keyword-link=\"linked\" data-wpil-monitor-id=\"572\">We<\/a> highly value the trust of our customers and use advanced technologies such as Hydrogen Decrepitation to ensure magnet performance and help customers reduce costs. <a href=\"https:\/\/osencmag.com\/get-a-quote\/\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\">Contact us now to get a quote.<\/span><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a7c3b5 elementor-widget elementor-widget-heading\" data-id=\"4a7c3b5\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"Production\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Implementing Hydrogen Decrepitation in NdFeB Magnet Production.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4b11492 elementor-widget elementor-widget-video\" data-id=\"4b11492\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=0OivtRfarVQ&quot;,&quot;lazy_load&quot;:&quot;yes&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c84df96 elementor-widget elementor-widget-text-editor\" data-id=\"c84df96\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Hydrogen Decomposition (HD) is a crucial process to improve the properties of\u2002materials which occurs as one of the key steps in the production of permanent magnet alloy magnets. The efficient use and implementation of this technology leads us to the production\u2002of fine powder material for the manufacture of high performance permanent magnets. Well, as\u2002a practitioner, I will help you understand in this exposition how this hydrogen explosion is being put to practice in the manufacture of NdFeB magnets in our production hall.<\/span><\/p><ol><li><strong> Raw material preparation<\/strong><\/li><\/ol><p><span style=\"font-weight: 400;\">It is important to prepare raw materials before the hydrogen Decrepitation. For NdFeB magnets, solid neodymium (Nd), iron (Fe), and boron (B) ingots, or powders, are used as raw\u2002materials. We can call this procedure the preparation process where we make sure that the NdFeB crude material melted in the\u2002earlier stage was clear of the contaminants. This will\u2002ensure a clean, hydrogen absorbing, bursting process. When narrowing\u2002down SmCo5 magnets, because its magnets are quasi mono-phasic, the pressure allows the hydrogen reaction very different with NdFeB. The nature of the raw material\u2002dictates the needs of the subsequent process.<\/span><\/p><ol start=\"2\"><li><strong> Hydrogenation<\/strong><\/li><\/ol><p><span style=\"font-weight: 400;\">The actual Hydrogen Decrepitation\u2002follows. Now, the rare earth magnet is exposed to a pure hydrogen reaction chamber, or (as will be described) to a mixture of hydrogen plus one\u2002or more inert gases (e.g., nitrogen or argon). The hydrogen content (or hydrogen gas mixture) is generally between 0.5%\u2002and 10% and should be adjusted according to the actual situation.<\/span><\/p><p><span style=\"font-weight: 400;\">A non-explosive gas\u2002mixture allows simpler equipment and makes gas handling safer. If a selected magnet is designed to be positioned within an apparatus that is still part of\u2002a larger assembly, then the use of potentially explosive mixtures can be a hazardous activity.<\/span><\/p><ol start=\"3\"><li><strong> Control of hydrogen flow and temperature<\/strong><\/li><\/ol><p><span style=\"font-weight: 400;\">Hydrogen is introduced into the reaction chamber at a controlled temperature, usually between 25\u00b0C and 400\u00b0C, and some special cases are slowly heated from -30\u00b0C to 600\u00b0C. The hydrogen flow and temperature must be carefully controlled throughout the process. If the temperature is too high, it may cause excessive decomposition. The temperature is too low and the hydrogen explosion reaction will be too slow.<\/span><\/p><p><span style=\"font-weight: 400;\">If\u2002not enough hydrogen flows, the magnet structure may not be completely destroyed. As per our previous calculation of the previous data for the production of magnets, we have five most common and implementable hydrogen pressure data sets: 0.01 mbar-100 bar, 0.1 bar- 70 bar, 0.1 bar-50 bar, 0.5 bar-20 bar or 1\u2002bar-10 bar. The gas pressure\u2002can strengthen whether the gas is moving and how the surface of the magnet is coated.<\/span><\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6887\" src=\"https:\/\/osencmag.com\/wp-content\/uploads\/2025\/02\/Schematic-diagram-of-time-temperature-and-pressure-for-the-hydrogen-decrepitation-process.webp\" alt=\"Schematic diagram of time, temperature and pressure for the hydrogen decrepitation process\" width=\"550\" height=\"350\" \/><\/p><p><span style=\"font-weight: 400;\">This process is not a simple blowing and heating, and the operator needs to maintain a balanced flow of hydrogen. The goal here is to introduce hydrogen into the material&#8217;s crystal structure, breaking brittle metallic bonds and thereby producing smaller, more uniform particles. Our construction personnel will need to continuously supply hydrogen and perform precise control to ensure that the required reaction occurs within the specified time.<\/span><\/p><ol start=\"4\"><li><strong> Explosion reaction<\/strong><\/li><\/ol><p><span style=\"font-weight: 400;\">At this point, hydrogen penetrates the material, causing the particles to burst open because of the pressure created internally from hydrogen;\u2002true explosion reaction. The bits get\u2002smaller and flakier. It can take from several hours to several days, depending on the material properties and the specific alloy, for\u2002this reaction to take place. This is also why the temperature and airflow data above is grouped: this process\u2002is slow.<\/span><\/p><p><span style=\"font-weight: 400;\">Not only does this reduce the material&#8217;s handling properties, it also assists with attaining a more\u2002homogenous microstructure. Failure to detonate hydrogen leaves\u2002you with a coarse, unsatisfactory powder that does not meet the ultra-high standards of permanent magnets. Properly\u2002done decrepitation leads to the magnetic powder being fine, uniform, and with compactability.<\/span><\/p><ol start=\"5\"><li><strong> Cooling and Post-Decrepitation Processing<\/strong><\/li><\/ol><p><span style=\"font-weight: 400;\">Once the hydrogen decrepitation is\u2002done, our staff carefully retrieves the powder and lets it cool down. Make sure the hydrogen gets vented safely during this cooling\u2002process. The cooling needs to be controlled (i.e. gradual) to prevent any\u2002sudden drop in temperature which can result in cracks\/fractures that will be detrimental to the hydrogen decrepitation process.<\/span><\/p><ol start=\"6\"><li><strong> Compact and Shape Magnets<\/strong><\/li><\/ol><p><span style=\"font-weight: 400;\">Once the hydrogen decrepitation process has been completed, the next step is to compact the\u2002now fine and uniform NdFeB powder. This is usually done by molding or isostatic pressing, where the powder is pressed under intense high pressures into the desired shape for the magnet and\u2002sintered.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/p><p><span style=\"font-weight: 400;\">Hydrogen decrepitation makes the powder easier to handle and shape. The small particle size achieved by decrepitation helps achieve a higher green body density, resulting in a stronger, denser magnet after sintering.<br \/>In my opinion, there are two aspects of hydrogen decrepitation that are most easily overlooked in the effective implementation of permanent magnet production: feedstock composition and hydrogen release. It begins with suitable materials selection and alloy design, since not\u2002all permanent magnet alloys can be hydrogen decrepitated successfully. The alloy needs to be carefully designed as well so that\u2002absorbing hydrogen will not make the material too brittle. So the hydrogen imprisioned during hydrogen decrepitation has\u2002to be fully eliminated. Contamination by residual hydrogen can be detrimental to the\u2002properties of the powder.<br \/><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7c23fc9 elementor-widget elementor-widget-text-editor\" data-id=\"7c23fc9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Hydrogen decrepitation is such a powerful technique for\u2002treating NdFeB magnets, and every step is of great importance. During\u2002the hydrogen decrepitation process, our production lines meticulously regulate air pressure, temperature, time and post-processing steps at each stage, significantly reducing waste material, increasing the effective use of material and lowering production costs. Train fine, uniform, well-pressed\u2002and excellent performance magnest powder. <a href=\"https:\/\/osencmag.com\/contact\/\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\">We are welcome to contact us at any time, if there is a customization\u2002need for permanent magnets.<\/span><\/a> We will leverage as much as we can and try our best to supply\u2002you with high-performance magnets.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-75d3317b elementor-widget-divider--view-line_text elementor-widget-divider--element-align-center elementor-widget elementor-widget-divider\" data-id=\"75d3317b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t\t<h2 class=\"elementor-divider__text elementor-divider__element\">\n\t\t\t\tFAQs\t\t\t\t<\/h2>\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-353cd8fa elementor-widget elementor-widget-toggle\" data-id=\"353cd8fa\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"faq\" data-widget_type=\"toggle.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-toggle\">\n\t\t\t\t\t\t\t<div class=\"elementor-toggle-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8931\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-8931\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon elementor-toggle-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-closed\"><i class=\"fas fa-caret-right\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-opened\"><i class=\"elementor-toggle-icon-opened fas fa-caret-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-toggle-title\" tabindex=\"0\">What is hydrogen decrepitation of magnets?<\/a>\n\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<div id=\"elementor-tab-content-8931\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-8931\"><p>Magnet Hydrogen Demolition is a process step used in the production of Neodymium magnets to create extremely small grains in the material. Using this method, extremely small grains with a particle size of less than or equal to 5 microns can be produced, ensuring stable magnetic properties.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-toggle-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8932\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-8932\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon elementor-toggle-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-closed\"><i class=\"fas fa-caret-right\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-opened\"><i class=\"elementor-toggle-icon-opened fas fa-caret-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-toggle-title\" tabindex=\"0\">What is the hydrogen processing of magnetic scrap?<\/a>\n\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<div id=\"elementor-tab-content-8932\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-8932\"><p><span style=\"font-weight: 400;\">The HPMS (Hydrogen Processing of Magnetic Scrap) process is a very efficient recycling process in which sintered Nd-Fe-B magnets disintegrate into a loose, demagnetized, hydrogenated powder when exposed to hydrogen. <\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-toggle-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8933\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-8933\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon elementor-toggle-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-closed\"><i class=\"fas fa-caret-right\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-opened\"><i class=\"elementor-toggle-icon-opened fas fa-caret-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-toggle-title\" tabindex=\"0\">What is the temperature of hydrogen annealing?<\/a>\n\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<div id=\"elementor-tab-content-8933\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-8933\"><p><span style=\"font-weight: 400;\">The trapped hydrogen atoms are extracted from the container via\u2002effusion leading to hydrogen embrittlement and the material is placed in a Closed Container for 3-4 hours at 200 to 300 \u00b0C in a hydrogen annealing oven. This process is performed primarily immediately following the welding, coating or galvanising of\u2002the components.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-toggle-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8934\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-8934\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon elementor-toggle-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-closed\"><i class=\"fas fa-caret-right\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-opened\"><i class=\"elementor-toggle-icon-opened fas fa-caret-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-toggle-title\" tabindex=\"0\">What is the temperature coefficient of NdFeB?<\/a>\n\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<div id=\"elementor-tab-content-8934\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-8934\"><p><span style=\"font-weight: 400;\">The reversible temperature coefficient of coercivity for NdFeB ranges from -0.45 to -0.65 depending on grade. To perform satisfactorily at elevated temperatures, room temperature Hci must be high.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-toggle-item\">\n\t\t\t\t\t<h3 id=\"elementor-tab-title-8935\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-8935\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon elementor-toggle-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-closed\"><i class=\"fas fa-caret-right\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-toggle-icon-opened\"><i class=\"elementor-toggle-icon-opened fas fa-caret-up\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-toggle-title\" tabindex=\"0\">Does magnet attract hydrogen?<\/a>\n\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<div id=\"elementor-tab-content-8935\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-8935\"><p><span style=\"font-weight: 400;\">For the H\u2082 molecules, this means that two electrons in a orbital has a paired\u2002opposite spins and singularly occupied with respect to the bonding orbital. That\u2002is why H\u2082 is extremely weakly magnetic.<\/span><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is hydrogen decrepitation of magnets?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<p>Magnet Hydrogen Demolition is a process step used in the production of Neodymium magnets to create extremely small grains in the material. Using this method, extremely small grains with a particle size of less than or equal to 5 microns can be produced, ensuring stable magnetic properties.<\\\/p>\"}},{\"@type\":\"Question\",\"name\":\"What is the hydrogen processing of magnetic scrap?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<p><span style=\\\"font-weight: 400;\\\">The HPMS (Hydrogen Processing of Magnetic Scrap) process is a very efficient recycling process in which sintered Nd-Fe-B magnets disintegrate into a loose, demagnetized, hydrogenated powder when exposed to hydrogen. <\\\/span><\\\/p>\"}},{\"@type\":\"Question\",\"name\":\"What is the temperature of hydrogen annealing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<p><span style=\\\"font-weight: 400;\\\">The trapped hydrogen atoms are extracted from the container via\\u2002effusion leading to hydrogen embrittlement and the material is placed in a Closed Container for 3-4 hours at 200 to 300 \\u00b0C in a hydrogen annealing oven. This process is performed primarily immediately following the welding, coating or galvanising of\\u2002the components.<\\\/span><\\\/p>\"}},{\"@type\":\"Question\",\"name\":\"What is the temperature coefficient of NdFeB?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<p><span style=\\\"font-weight: 400;\\\">The reversible temperature coefficient of coercivity for NdFeB ranges from -0.45 to -0.65 depending on grade. To perform satisfactorily at elevated temperatures, room temperature Hci must be high.<\\\/span><\\\/p>\"}},{\"@type\":\"Question\",\"name\":\"Does magnet attract hydrogen?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<p><span style=\\\"font-weight: 400;\\\">For the H\\u2082 molecules, this means that two electrons in a orbital has a paired\\u2002opposite spins and singularly occupied with respect to the bonding orbital. That\\u2002is why H\\u2082 is extremely weakly magnetic.<\\\/span><\\\/p>\"}}]}<\/script>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Hydrogen Decrepitation During Neodymium Magnet Production. Hydrogen Decrepitation vs Traditional Powder Metallurgy. Implementing Hydrogen Decrepitation in NdFeB Magnet Production. FAQ. 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