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A kind of high temperature resistant neodymium iron boron magnet and its preparation method

A technology of high temperature resistance and NdFeB, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., to achieve the effect of improving high temperature resistance, improving microstructure, and improving high temperature resistance

Active Publication Date: 2022-02-22
慈溪市兴发磁业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technical problems, the inventor believes that when the above-mentioned NdFeB magnets are used in equipment, the temperature generated by the equipment due to long-term operation will continue to heat the above-mentioned NdFeB materials, and the high temperature is extremely easy to cause damage to the above-mentioned NdFeB magnets are demagnetized, therefore, the high temperature resistance of the above NdFeB magnets still needs to be improved

Method used

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  • A kind of high temperature resistant neodymium iron boron magnet and its preparation method
  • A kind of high temperature resistant neodymium iron boron magnet and its preparation method
  • A kind of high temperature resistant neodymium iron boron magnet and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A high temperature resistant neodymium iron boron magnet adopts the following preparation method:

[0047] (1) Add 188g of praseodymium-neodymium alloy, 391g of iron and 30.5g of boron into the vacuum induction quick-setting furnace, and then carry out vacuum melting at a temperature of 850°C for 1 hour to obtain the NdFeB magnet base material;

[0048] (2) Add 8g of gadolinium-iron alloy, 3.5g of copper, 5g of dysprosium and NdFeB magnet base material into the vacuum vacuum induction quick-setting furnace, and then carry out vacuum melting at a temperature of 1750°C for 1h to obtain a high-temperature resistant NdFeB magnet raw material;

[0049] (3) The high-temperature-resistant NdFeB magnet raw material is finely ground through a hydrogen crushing furnace and a jet mill, and then the high-temperature-resistant NdFeB magnetic powder with a mesh number of 800 mesh is obtained;

[0050] (4) Press the high-temperature-resistant NdFeB magnetic powder through a magnetic fi...

Embodiment 2-3

[0052] The difference from Example 1 is that the weight of each component of the raw materials in Examples 2-3 is different, as shown in Table 2.

[0053] Each raw material composition and its weight (g) in table 2 embodiment 1-3

[0054] Raw material composition Example 1 Example 2 Example 3 Praseodymium neodymium alloy 188 210 160 iron 391 360 420 boron 30.5 20 40 Gadolinium iron alloy 8 18 4 copper 3.5 1 6 dysprosium 5 8 2

Embodiment 4

[0056] The difference from Example 1 is that the weight of the iron-gadolinium alloy is 18g.

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Abstract

This application relates to the technical field of NdFeB magnets, more specifically, it relates to a high temperature resistant NdFeB magnet and a preparation method thereof. High temperature resistant NdFeB magnets are made of raw materials containing the following parts by weight: 160‑210 parts of praseodymium neodymium alloy, 360‑420 parts of iron, 20‑40 parts of boron, 4‑18 parts of grain boundary alloy materials, 1‑6 parts of A high-temperature-resistant material and 2-8 parts of a second high-temperature-resistant material, and the grain boundary alloy material is one or a combination of iron-cobalt-vanadium alloy and gadolinium-iron alloy. The preparation method of high temperature resistant NdFeB magnet: (1) initial smelting; (2) remelting; (3) hydrogen crushing powder; (4) pressing; (5) sintering and tempering. The high temperature resistant NdFeB magnet and the preparation method thereof of the present application have the advantage of improving the high temperature resistant performance of the NdFeB magnet.

Description

technical field [0001] This application relates to the technical field of NdFeB magnets, more specifically, it relates to a high temperature resistant NdFeB magnet and a preparation method thereof. Background technique [0002] NdFeB magnet is a permanent magnet material with excellent magnetic properties. It is widely used in electronics, electric machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. The more common ones are permanent magnet motors, speakers, Magnetic separators, computer disk drives, magnetic resonance imaging equipment instruments, etc. [0003] In related technologies, traditional NdFeB magnets are mainly composed of the following raw materials: 29-32 parts of rare earth metal neodymium, 64-69 parts of metallic element iron, 1.1-1.2 parts of non-metallic element boron, and the sintering of traditional NdFeB magnets The method is to directly smelt, hydrogen break, press and sinter the rare earth metal neodymium, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/057H01F1/0573H01F1/0576H01F1/0577H01F41/0253H01F41/0266
Inventor 胡建新胡建贞胡泽君胡浩君
Owner 慈溪市兴发磁业科技有限公司