Method for decreasing harmful gases in process of sintering sintered neodymium iron boron (NdFeB) magnet
A sintering process, harmful gas technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems affecting the product qualification rate, surface coating blistering, magnet blank cracks, etc., to reduce cracks and improve oxidation resistance. , the effect of improving the vacuum degree
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[0024] Example 1
[0025] The alloy of 9.7Pr-19Nd-4Dy-0.5Al-0.1Cu-1.2Co-1.0B-balance Fe is smelted in a vacuum induction furnace to obtain a neodymium-iron-boron alloy, which is subjected to hydrogen explosion treatment after coarse and medium crushing. The powder is pulverized by jet mill to obtain 3.7-4.0 μm neodymium iron boron alloy powder. The compacting size of the green body is D20×28. The dehydrogenation device is placed in the sintering furnace and placed inside the furnace body of the sintering furnace. Wherein, the dehydrogenation device is a closed stainless steel box in which is placed broken into 10×10×10mm 3 A small piece of LaNi5 hydrogen storage alloy activated by 99.99% high-purity hydrogen, and the device has a mechanical transmission device to control the opening and closing of the box. The hydrogen storage alloy occupies 1 / 3 of the volume of the box. The molybdenum belt distance of the sintering furnace is 15 cm. The green body is put into a sintering furn...
Example Embodiment
[0026] Example 2
[0027] The alloy with the composition of 10.3Pr-20Nd-4Dy-0.5Tb-0.2Gd-0.5Al-0.1Cu-1.2Co-1.2B-balance Fe is smelted in a vacuum induction furnace to obtain a neodymium-iron-boron alloy. After coarse and medium crushing Carry out hydrogen explosion treatment and grind the powder with jet mill to obtain 3.7-4.0 μm neodymium iron boron alloy powder. The compacting size of the green body is D20×28. The dehydrogenation device is placed in the sintering furnace and placed inside the furnace body of the sintering furnace. Wherein, the dehydrogenation device is a closed stainless steel box in which is placed broken into 10×10×10mm 3 A small piece of LaCeNi5 hydrogen storage alloy activated by 99.99% high-purity hydrogen, and the device has a mechanical transmission device to control the opening and closing of the box. The hydrogen storage alloy occupies 1 / 3 of the volume of the box. The molybdenum belt distance of the sintering furnace is 15 cm. Put the green body int...
Example Embodiment
[0028] Example 3
[0029] The alloy with the composition of 25.6Nd-2.4Dy-0.1Ga-0.9B-balance Fe is processed into a thin strip by a thin strip process, and then subjected to hydrogen explosion treatment, and powdered by jet milling to obtain 3.7~4.0μm neodymium iron boron alloy powder . The compacting size of the green body is D20×28. The dehydrogenation device is placed in the sintering furnace and placed inside the furnace body of the sintering furnace. Wherein, the dehydrogenation device is a closed stainless steel box in which is placed broken into 10×10×10mm 3 A small piece of LaCePrNi5 hydrogen storage alloy activated by 99.99% high-purity hydrogen, and the device has a mechanical transmission device to control the opening and closing of the box. The hydrogen storage alloy accounts for 1 / 3 of the volume of the box. The molybdenum belt distance of the sintering furnace is 15 cm. The green body is put into a sintering furnace for sintering and aging. The sintering process i...
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