A kind of sintered NdFeB magnet and its preparation method

A technology of NdFeB and magnets, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of development constraints, high prices, and increased production costs of sintered NdFeB magnets, and achieve savings Cost, reduced weight loss, good performance effects

Active Publication Date: 2020-08-21
ZHEJIANG ZHONGHANG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mass of rare earth elements in sintered NdFeB permanent magnets accounts for about 30%. At present, with the continuous expansion of my country's rare earth permanent magnet industry, my country's rare earth reserves of precious resources are getting less and less, which leads to the production of sintered NdFeB permanent magnets. The price of main rare earth metals, such as praseodymium, neodymium, dysprosium, etc. is getting higher and higher, which greatly increases the production cost of sintered NdFeB magnets, making the development of the industry quite restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A sintered NdFeB magnet provided in this example is composed of the following components: rare earth element R: 30wt%, Al: 0.8wt%, Pr: 0.04wt%, C: 0.05wt%, Cu : 0.5wt%, Nd: 0.1wt%, Ga: 0.3wt%, Pm: 0.4wt%, Co: 0.9wt%, B: 0.95wt%, Fe balance; the rare earth element R is Ce, Ho, Sm , Dy, Tm mixture, its mixing mass ratio is Ce:Ho:Sm:Dy:Tm=5:4:1:0.3:2.

[0019] The preparation method of the above-mentioned sintered NdFeB magnet comprises the following steps:

[0020] The first step: the mixing of rare earth elements, first remove the rust spots and impurities on the surface of the raw materials of Ce, Ho, Sm, Dy, Tm, and then break them into small pieces with a maximum length, width and thickness of less than 40mm, and then grind them In a powdered state, the mass ratio is Ce: Ho: Sm: Dy: Tm = 5: 4: 1: 0.2: 2. Mix evenly and set aside;

[0021] The second step: batching, remove the surface rust and impurities of the raw material blocks of each component except ...

Embodiment 2

[0030] The preparation method of a sintered NdFeB magnet provided in this example is exactly the same as in Example 1, the main difference is that the mass percentage of the raw material components is different. In this example, the iron-boron magnet is composed of the following components: rare earth Elements R: 28.5wt%, Al: 0.8wt%, Pr: 0.04wt%, C: 0.05wt%, Cu: 0.5wt%, Nd: 0.08wt%, Ga: 0.3wt%, Pm: 0.4wt%, Co : 0.9wt%, B: 0.95wt%, Fe balance; the rare earth element R is a mixture of Ce, Ho, Sm, Dy, Tm, and its mixed mass ratio is Ce: Ho: Sm: Dy: Tm=5 :4:1:0.3:2.

[0031] The obtained product is 20mm×15mm×1.5mm, and its magnetic performance is tested with NIM2000 magnetic measuring instrument of China Metrology Institute. The results are shown in Table 1.

Embodiment 3

[0033]The preparation method of a sintered NdFeB magnet provided in this example is exactly the same as in Example 1, the main difference is that the mass percentage of the raw material components is different. In this example, the iron-boron magnet is composed of the following components: rare earth Elements R: 29.5wt%, Al: 0.8wt%, Pr: 0.04wt%, C: 0.05wt%, Cu: 0.5wt%, Nd: 0.1wt%, Ga: 0.3wt%, Pm: 0.4wt%, Co : 0.9wt%, B: 0.95wt%, Fe balance; the rare earth element R is a mixture of Ce, Ho, Sm, Dy, Tm, and its mixed mass ratio is Ce: Ho: Sm: Dy: Tm=5 :4:1:0.3:2.

[0034] The resulting product is 20mm×15mm×1.5mm, and its magnetic properties are tested with the NIM2000 magnetic measuring instrument of the China Metrology Institute; at the same time, a common NdFeB magnet on the market is 20mm×15mm×1.5mm, and the results are shown in Table 1.

[0035] Table 1:

[0036] Remanence / KGs Magnetic energy product / MGOe Internal coercive force / KOe Example 1 13.23 42....

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PUM

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Abstract

The invention discloses sintered neodymium iron boron magnet steel which comprises, in weight percent, 27.5-30.5wt% of rare earth element R, 0.5-1.0wt% of Al, 0.03-0.06wt% of Pr, 0.03-0.06wt% of C, 0.35-0.5wt% of Cu, 0.08-0.12wt% of Nd, 0.2-0.4wt% of Ga, 0.2-0.5wt% of Pm, 0.6-1.2wt% of Co, 0.75-1.35wt% of B and the balance Fe. The rare earth element R is mixture of Ce, Ho, Sm, Dy and Tm, and the mixed weight ratio of Ce, Ho, Sm, Dy to Tm is 5:4:1:0.3:2. The invention further discloses a preparation method of the magnet steel. The preparation method is easy to operate, Ho and the rare earth elements such as Ce, Sm, Dy and Tm are added, part of expensive Nd and Pr is replaced, cost is reduced, corrosion resistance of the sintered neodymium iron boron magnet steel can be effectively improvedby adding Ho, weightlessness is reduced, Ce replaces Nd, eutectic temperature is reduced, so that sintering tempering temperature is reduced, cost is saved, and good performances are kept.

Description

technical field [0001] The invention relates to a sintered NdFeB magnet, in particular to a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] Due to its superior magnetic properties, sintered NdFeB has been used in new energy fields such as wind power generation and new energy vehicles in recent years, and has become one of the key materials to promote the rapid development of the new energy industry. The mass of rare earth elements in sintered NdFeB permanent magnets accounts for about 30%. At present, with the continuous expansion of my country's rare earth permanent magnet industry, my country's rare earth reserves of precious resources are becoming less and less, which leads to the production of sintered NdFeB permanent magnets. The price of main rare earth metals, such as praseodymium, neodymium, and dysprosium, is getting higher and higher, which greatly increases the production cost of sintered NdFeB magnets, and makes the developmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/06C22C38/16C22C38/10
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/16H01F1/0577H01F41/0266
Inventor 徐嘉诚
Owner ZHEJIANG ZHONGHANG NEW MATERIAL
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