Sintered composite main phase permanent magnet and preparation method thereof

A composite main phase and permanent magnet technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve problems such as inability to maintain high remanence Br, inconsistent distribution of magnetic properties, limited diffusion depth, etc.

Pending Publication Date: 2022-03-08
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, during the diffusion process of heavy rare earth HR elements, due to the size of the bulk sintered R-Fe-B permanent magnet, the diffusion depth in the sintered R-Fe-B permanent magnet is very limited and the bulk sintered R-Fe-B Inconsistent distribution of magnetic properties inside rare earth permanent magnets
The above sintered R-Fe-B rare earth permanent magnets cannot maintain high remanence Br or have poor thermal stability of magnetic properties under high temperature environment

Method used

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  • Sintered composite main phase permanent magnet and preparation method thereof
  • Sintered composite main phase permanent magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～18

[0067] The chemical formula of the R-Fe-B alloy in the sintered R-Fe-B and HR-Fe-B composite main phase permanent magnets of Examples 1 to 18 of the present invention is Nd by atomic percentage 13.90 B5.75 co 1.00 Cu 0.30 Ga 0.20 Zn 0.10 Zr 0.05 Ti 0.10 Fe 余量 , and satisfy n 2Cu +n 2Zn ≥n 1Ga ; The chemical formula of HR-Fe-B alloy is Tb by atomic percentage 18.50 B 5.35 Cu 0.20 Ga 0.20 Zn 0.20 Fe 余量 , and satisfy n 2Ga +n 2Zr ≤n 2Cu +n 2Zn ≤2.0×n 2Ga ;

[0068] The sintered Nd-Fe-B and Tb-Fe-B composite main phase permanent magnets are made by the following steps:

[0069] Smelting: Nd-Fe-B alloy flakes are obtained after melting the raw materials of Nd-Fe-B alloy, with an average thickness of 0.358mm; Tb-Fe-B alloy flakes are obtained after melting the raw materials of Tb-Fe-B alloy, The average thickness is 0.347mm;

[0070] Crushing: Nd-Fe-B alloy flakes and Tb-Fe-B alloy flakes are hydrogen broken to form coarse powder;

[0071] Mixing: Nd-Fe-B allo...

Embodiment 19～24

[0076] The chemical formula of the R-Fe-B alloy in the sintered R-Fe-B and HR-Fe-B composite main phase permanent magnets of Examples 19 to 24 in the present invention is Nd by atomic percentage 13.75 B 5.80 co 1.20 Cu 0.20 Ga 0.10 Zn 0.10 Zr 0.15 Fe 余量 , and satisfy n 2Cu +n 2Zn ≥n 1Ga ; The chemical formula of HR-Fe-B is Tb by atomic percentage 17.50 B 5.45 Cu 0.20 Ga 0.20 Zn 0.10 Zr 0.10 Fe 余量 , and satisfy n 2Ga +n 2Zr ≤n 2Cu +n 2Zn ≤2.0×n 2Ga ;

[0077] The sintered Nd-Fe-B and Tb-Fe-B composite main phase permanent magnets are made by the following steps:

[0078] Melting: Smelting the Nd-Fe-B alloy raw materials to obtain Nd-Fe-B alloy flakes with an average thickness of 0.353mm; melting the Tb-Fe-B alloy raw materials to obtain Tb-Fe-B alloy ingots , with an average thickness of 1.95cm;

[0079] Crushing: Nd-Fe-B alloy flakes and Tb-Fe-B alloy ingots are respectively hydrogen broken to form Nd-Fe-B alloy coarse powder and Tb-Fe-B alloy coarse pow...

Embodiment 7、22

[0110] Compared with Comparative Examples 6, 7, and 8 in Examples 7 and 22, when the content of Cu, Zn, Ga, and Zr elements in the Tb-Fe-B alloy does not satisfy n 2Ga +n 2Zr ≤n 2Cu +n 2Zn ≤2.0×n 2Ga , the remanence Br and coercive force Hcj of sintered Nd-Fe-B and Tb-Fe-B composite main phase permanent magnets are lower, the main reason is that some Nd is formed in the Tb-Fe-B alloy 6 Fe 13 Cu and Nd 6 Fe 13 Ga-type compounds, Tb 2 Fe 17 Phase, TbFe 2 equal. These substances are magnetic, the saturation magnetization Js is low, and cannot effectively remove Nd 2 Fe 14 B.Tb 2 Fe 14 The inter-grain coupling effect of B main phase leads to low remanence Br and coercive force Hcj of sintered Nd-Fe-B and Tb-Fe-B composite main phase permanent magnets.

[0111] Compared with Comparative Example 9 in Examples 7 and 22, when the content of heavy rare earth HR elements in the Tb-Fe-B alloy increases to 23, the coercivity of the sintered Nd-Fe-B and Tb-Fe-B composite main...

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Abstract

The invention provides a sintered composite principal phase permanent magnet and a preparation method thereof, the sintered composite principal phase permanent magnet comprises principal phase grains of R2Fe14B and HR2Fe14B type compounds, the raw materials of the sintered composite principal phase permanent magnet comprise R-Fe-B alloy and HR-Fe-B alloy, the chemical formula of the R-Fe-B alloy is Ra1Bb1Tc1Fe according to atomic percent, and the chemical formula of the HR-Fe-B alloy is HRa2Bb2Tc2Fe according to atomic percent; wherein 13.50 < = a1 < = 14.50, 5.50 < = b1 < = 6.00, and 1.00 < = c1 < = 2.50; 16.00 < = a2 < = 22.00, 4.80 < = b2 < = 5.60, and 0.05 < = c2 < = 1.20. And the sintered R-Fe-B and HR-Fe-B composite main phase high-temperature-resistant permanent magnet which is low in cost and has high residual magnetism Br and high coercive force Hcj at the same time is obtained.

Description

technical field [0001] The invention relates to a sintered composite main phase permanent magnet and a preparation method thereof, in particular to a sintered R-Fe-B, HR-Fe-B composite main phase permanent magnet and a preparation method thereof. Background technique [0002] Since Nd 2 Fe 14 Since the sintered Nd-Fe-B rare earth permanent magnet with B compound as the main phase was discovered in 1984, due to its excellent magnetic properties (high saturation magnetization, high energy product), it is the permanent magnet with the highest performance among permanent magnets. Widely used in various electric motors such as electric vehicle motors, industrial motors, and air-conditioning compressors. Due to the high operating temperature of these motors, in order to operate normally in a high temperature environment, the permanent magnets are required to still have high remanence Br and coercive force Hcj in a high temperature environment. [0003] In recent years, the grai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266H01F41/0293
Inventor 白锁段东伟李柱柏周建军李永峰刘艳丽章明左建华刘飞
Owner INNER MONGOLIA UNIV OF SCI & TECH
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