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Preparation method of sintered NdFeB magnet with low carbon content

A technology of NdFeB and carbon content, which is applied in the direction of magnetic objects, magnetic materials, metal processing equipment, etc., and can solve problems affecting the service life and corrosion resistance of magnets

Active Publication Date: 2020-07-07
京磁材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the carbon is too high, it will greatly affect the corrosion resistance of the magnet, and also greatly affect its service life. Therefore, how to improve the thermal stability of the NdFeB magnet and reduce the carbon content in the sintered NdFeB magnet. Abrasion resistance is worth thinking about

Method used

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  • Preparation method of sintered NdFeB magnet with low carbon content
  • Preparation method of sintered NdFeB magnet with low carbon content

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Embodiment 1

[0028] The preparation method of the sintered NdFeB magnet with low carbon content comprises the following steps:

[0029] Step 1. Carry out vacuum smelting of NdFeB magnet raw materials to obtain NdFeB magnet alloys, wherein, the NdFeB magnet raw materials include: Nd 35%, B 2.5%, Cu 1.8%, Si 1.8%, The balance is Fe;

[0030] Step 2: The NdFeB magnet alloy is subjected to hydrogen explosion treatment, and then 0.1% of the mass of the NdFeB magnet alloy is added with a protective agent. After mixing, the NdFeB magnet powder is made into NdFeB powder by jet milling with argon protection, and then pressed to obtain Neodymium-iron-boron green body 9, wherein the protective agent consists of 50% zinc stearate, 30% butyl acetate, and 20% turpentine by mass percentage;

[0031] Step 3: Apply 100V voltage to the opposite sides of the NdFeB green body 9, and energize it for 1 hour, and during the whole electrification process, the NdFeB green body 9 is filled with argon, and the temp...

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Abstract

The invention discloses a preparation method of a sintered NdFeB magnet with low carbon content. 35%, B 2.5%, Cu 1.8%, Si 1.8%, and the balance is Fe; step 2, the NdFeB magnet alloy is subjected to hydrogen explosion treatment, ground into NdFeB powder, and pressed to obtain a NdFeB green body ; Step 3, load voltage on the opposite sides of the NdFeB green body, energize, and the NdFeB green body is filled with argon during the whole electrification process, and the temperature is kept at 100 ℃ The environment is carried out; Step 4, Step 3 The treated NdFeB green body is vacuum sintered to obtain a sintered NdFeB magnet. The invention has the beneficial effects of improving the thermal stability of the NdFeB magnet, reducing the carbon content in the sintered NdFeB magnet and improving the wear resistance.

Description

technical field [0001] The invention relates to the field of sintered NdFeB magnets. More specifically, the present invention relates to a method for preparing a sintered NdFeB magnet with low carbon content. Background technique [0002] Since the advent of Nd-Fe-B rare earth permanent magnet materials, due to its high cost performance, small size, light weight, good mechanical properties, strong magnetism, and high energy density, NdFeB permanent magnet materials have been widely used in modern industry and electronic technology. It has been widely used, and with the development of hybrid electric vehicles, there will be great opportunities for development in the future. Therefore, the demand for NdFeB is also increasing, and the requirements for its properties such as thermal stability and wear resistance have been significantly improved. The thermal stability of NdFeB is generally expressed by the temperature coefficient of remanence, temperature coefficient of coerciv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/02B22F1/00B22F3/10H01F1/057
CPCH01F1/0577C22C38/005C22C38/02C22C38/16C22C38/32B22F3/1007B22F2999/00B22F2998/10B22F1/10B22F9/023B22F2009/044B22F3/04B22F2202/06B22F2201/20B22F2202/05
Inventor 房宏伟
Owner 京磁材料科技股份有限公司
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