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Sintered neodymium iron boron containing SmFeN or SmFeC and preparation method thereof

A neodymium iron boron, sm2fe17-xmx technology, applied in the field of sintered neodymium iron boron and its preparation, can solve the problems of complex process and high cost, and achieve the effects of simple operation, low cost and high resistance to high temperature

Active Publication Date: 2020-05-29
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the prior art, in order to improve the coercive force of NdFeB magnets, heavy rare earth elements are added; or the process of preparing NdFeB-SmFeN composite magnets is complicated, and the requirements for equipment are relatively strict, resulting in higher costs. The present invention provides A kind of sintered NdFeB containing SmFeN or SmFeC and its preparation method

Method used

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  • Sintered neodymium iron boron containing SmFeN or SmFeC and preparation method thereof
  • Sintered neodymium iron boron containing SmFeN or SmFeC and preparation method thereof
  • Sintered neodymium iron boron containing SmFeN or SmFeC and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Step 1: According to the nominal composition as Sm 2 Fe 17-x m x (Its formula component content is shown in Table 1) raw material, it is added in the intermediate frequency vacuum induction quick-setting throwing belt furnace that its frequency is 2000Hz, adopts melt rapid quenching method to prepare Th 2 Zn 17 Structured Sm 2 Fe 17-x m x Master alloy, the melting temperature is 1600°C, the casting temperature is 1500°C, the thickness of the smelted alloy sheet is 0.3mm; after homogenization annealing, the smelted alloy sheet is placed in a vacuum furnace at 500°C ;The heating time of annealing is 4h, so that the composition of the alloy sheet is more uniform and the stress of the alloy sheet is eliminated;

[0077] Step 2: Put the Sm 2 Fe 17-x m x The master alloy is crushed into Sm with particle size D50=1mm 2 Fe 17-x m x powder, and then under the protection of argon, jet milling is carried out under the condition of 0.5-0.7MPa to prepare Sm with D50=3.0μ...

Embodiment 2～6

[0083] In addition to the optional Sm 2 Fe 17-x m x The formula composition content of the raw materials is different (as shown in Table 1), and the parameters in the rest of the preparation process are the same as the preparation process of Example 1.

Embodiment 7

[0085] In addition to the optional Sm 2 Fe 17-x m x The formula component content of the raw materials (as shown in Table 1) is different from the operation of step 6, and the parameters in steps 1 to 5 are the same as the preparation process of Example 1.

[0086] Step 6: NdFeB-Sm after grain boundary diffusion treatment 2 Fe 17-x m x The composite magnet is placed in a rotary carbonization furnace, and after 5 hours of carbonization treatment at a temperature of 550 ° C, the Sm of the sintered NdFeB surface layer 2 Fe 17-x m x The alloy is fully nitrided to form a Sm 2 Fe 17-x m x C y structure to achieve NdFeB magnets and Sm 2 Fe 17-x m x Combination of magnets.

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Abstract

The invention discloses sintered neodymium iron boron containing SmFeN or SmFeCand a preparation method thereof. The preparation method comprises the following steps: S1, forming a coating taking Sm2Fe17-xMx as a diffusion source on a surface of a neodymium iron boron sintered body, and carrying out grain boundary diffusion treatment; and S2, carrying out nitriding treatment or carbonizing treatment, wherein if nitriding treatment is performed, sintered neodymium iron boron containing Sm2Fe17-xMxNy is obtained; if carbonizing treatment is performed, sintered neodymium iron boron containing Sm2Fe17-xMxCy is obtained; and the M is one or more of Co, Mo, Cu, Zr, Ti and Al, the x is equal to 0-2 and they is equal to 1-5. The sintered neodymiumironboron containing SmFeN or SmFeC is high in coercive force, high in high-temperature resistance and high in resistance, the coercive force is greatly increased before and after grain boundary diffusion treatment, and the preparation method is easyto operate and low in cost.

Description

technical field [0001] The invention relates to a sintered NdFeB containing SmFeN or SmFeC and a preparation method thereof. Background technique [0002] In the prior art, the coercive force of sintered NdFeB materials can be increased by adding heavy rare earth elements such as dysprosium Dy or terbium Tb. For example, the traditional metallurgical method is to directly add Dy or Tb into the main phase, but this method will cause the remanence Br of the NdFeB magnet to drop sharply. Another example is the grain boundary diffusion method to infiltrate Dy or Tb elements into the neodymium-rich phase to strengthen the main phase Nd 2 Fe 14 B, so as to improve the coercive force of the product. Although this method can reduce the usage of heavy rare earths such as Dy or Tb, the requirements for diffusion equipment and process methods are relatively harsh, resulting in higher product prices. [0003] Since the discovery of SmFeN or SmFeC materials, they have excellent intrin...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02C23C4/08C23C4/10C23C8/26C23C8/22C22C38/16C22C38/14C22C38/12C22C38/10C22C38/06
CPCC22C38/005C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16C23C4/08C23C4/10C23C8/22C23C8/26H01F1/0577H01F41/026H01F41/0266H01F41/0293
Inventor 王金磊黄清芳黄佳莹黎国妃
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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