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Low-weightlessness N50-type neodymium-iron-boron (Nd-Fe-B) magnet

A technology of NdFeB magnets, applied in the direction of magnetic objects, magnetic materials, permanent magnets, etc., can solve the problems of limited application range, high weight loss requirements, poor corrosion resistance, etc., and achieve optimized microstructure, uniform distribution, and improved The effect of microstructure

Inactive Publication Date: 2013-05-01
宁波合盛磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The poor corrosion resistance of ordinary NdFeB rare earth permanent magnets greatly limits its scope of use, especially for N50 type products. According to the product market, it also determines the technical status in the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A low weight loss N50 type NdFeB magnet, which consists of the following components in parts by mass:

[0026] 30.5 parts of NdPrDy;

[0027] 65.51 Fe;

[0028] 2 copies of Co;

[0029] 0.1 parts of Ga;

[0030] 0.99 copies of B;

[0031] 0.4 part Nb;

[0032] 0.3 parts Al;

[0033] 0.2 parts of Cu;

[0034] The low-weight NdFeB magnet is made by the following steps:

[0035] ①. Ingredients: Put praseodymium-neodymium alloy, boron, aluminum, copper, niobium, iron, cobalt, gallium and dysprosium-iron alloy into the NdFeB vacuum induction casting furnace according to the ratio. The weight of raw materials, and finally the weight of iron;

[0036] ②. Melting and casting: After the raw materials are loaded into the NdFeB vacuum induction casting furnace, the air in the NdFeB vacuum induction casting furnace is evacuated to less than 1Pa, and the heating and melting starts. When the raw materials in the furnace turn red, shut down The vacuum valve is filled with arg...

Embodiment 2

[0042] A low weight loss N50 type NdFeB magnet, which consists of the following components in parts by mass:

[0043] 30.5 parts of NdPrDy;

[0044] 65.51 Fe;

[0045] 2 copies of Co;

[0046] 0.1 parts of Ga;

[0047] 0.99 copies of B;

[0048] 0.4 part Nb;

[0049] 0.3 parts Al;

[0050] 0.2 parts of Cu;

[0051] The low-weight NdFeB magnet is made by the following steps:

[0052] ①. Ingredients: Put praseodymium-neodymium alloy, boron, aluminum, copper, niobium, iron, cobalt, gallium and dysprosium-iron alloy into the NdFeB vacuum induction casting furnace according to the ratio. The weight of raw materials, and finally the weight of iron;

[0053] ②. Melting and casting: After the raw materials are loaded into the NdFeB vacuum induction casting furnace, the air in the NdFeB vacuum induction casting furnace is evacuated to less than 1Pa, and the heating and melting starts. When the raw materials in the furnace turn red, shut down The vacuum valve is filled with arg...

Embodiment 3

[0059] A low weight loss N50 type NdFeB magnet, which consists of the following components in parts by mass:

[0060] 30.2 parts of NdPrDy;

[0061] 67.06 parts Fe;

[0062] 1 Co;

[0063] 0.15 parts of Ga;

[0064] 0.99 copies of B;

[0065] 0.3 part Nb;

[0066] 0.2 parts Al;

[0067] 0.1 parts of Cu;

[0068] The low-weight NdFeB magnet is made by the following steps:

[0069] ①. Ingredients: Put praseodymium-neodymium alloy, boron, aluminum, copper, niobium, iron, cobalt, gallium and dysprosium-iron alloy into the NdFeB vacuum induction casting furnace according to the ratio. The weight of raw materials, and finally the weight of iron;

[0070] ②. Melting and casting: After the raw materials are loaded into the NdFeB vacuum induction casting furnace, the air in the NdFeB vacuum induction casting furnace is evacuated to less than 1Pa, and the heating and melting starts. When the raw materials in the furnace turn red, shut down The vacuum valve is filled with argon ga...

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Abstract

A low-weightlessness N50-type neodymium-iron-boron magnet consists of the following components in parts by mass: 29 to 33 parts of neodymium praseodymium dysprosium (NdPrDy), 63 to 68.5 parts of iron (Fe), 0.5 to 3 parts of cobalt (Co), 0.05 to 0.2 part of gallium (Ga), 0.96 to 1.1 parts of boron (B), 0.1 to 0.6 part of niobium (Nb), 0.1 to 0.5 part of aluminum (Al) and 0.1 to 0.4 part of copper (Cu); and the low-weightlessness N50-type Nd-Fe-B magnet is produced through the steps of material mixing, casting in a Nd-Fe-B vacuum sensing cast piece furnace, hydrogen breaking in a hydrogen breaking furnace, pulverizing and screening through airflow, pressing and forming of a green blank and sintering. By adopting the way for compositely adding two trace metal of Co and Ga, the micro structure of the Nd-Fe-B alloy can be improved; and through the novel casting hydrogenation breaking process, the mass production of the low-weightlessness N50-type Nd-Fe-B magnet is realized, and the requirements of users on the high-performance low-weightlessness Nd-Fe-B magnet can be met.

Description

technical field [0001] The invention relates to an N50 type NdFeB magnet. Background technique [0002] The existing rare earth permanent magnet NdFeB (neodymium iron boron) is a new type of magnetic material developed in the 1980s. It has excellent characteristics such as high remanence, high energy product, high coercive force and high cost performance. Strong permanent magnet, known as the king of magnetism in permanent magnet materials. The main elements of neodymium iron boron are composed of Nd (neodymium), Fe (iron), and B (boron), but the coercive force of this ternary NdFeB magnet is very low, about 10KOe (kilooersted), which cannot be used. Therefore, in the actual production, various elements need to be added to improve performance before it can be suitable for different use environments. [0003] The weight loss of an uncoated magnet under high temperature, high pressure, and high humidity conditions can qualitatively reflect the service life of the magnet. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F7/02H01F41/02B22F3/16
Inventor 邵海波
Owner 宁波合盛磁业有限公司
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