Preparation method of sintered NdFeB magnet with high coercivity

A high coercive force, neodymium iron boron technology, applied in the direction of magnetic objects, inductors/transformers/magnets manufacturing, magnetic materials, etc., can solve the problems of insignificant coercive force improvement, difficult mass production, and low production efficiency. Achieve the effects of improving coercive force, improving magnetic properties and saving energy

Inactive Publication Date: 2018-08-10
NINGBO ZHAOBAO MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method still has disadvantages such as low production efficiency, high cost, difficulty in mass production, large investment in equipment or insignificant improvement of coercive force.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The NdFeB main alloy composition Nd11.76Fe82.36B5.88 (atomic percentage) and the auxiliary alloy composition Dy75Cu25 (atomic percentage) based on the 2:14:1 phase were respectively designed, and the ingredients were distributed according to the design, and the main alloy considered the rare earth Nd Burning loss 3% (percentage by weight), supplementary alloy considers burning loss 5% (percentage by weight) of rare earth Dy, puts the metal raw material that purity is 99.9wt% into high-vacuum smelting furnace and melts into ingot, and the control vacuum degree is 10 -3 Pa, the smelted alloy ingots were put into the hydrogen breaking furnace respectively, the hydrogen flow was 70ml / min, the reaction was 4 hours, and then the jet mill was 2 hours to prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 3.5μm and 1.5μm respectively. Alloy powder, add auxiliary alloy powder with a weight fraction of 2% to the main alloy powder, mix the...

Embodiment 2

[0026] The NdFeB main alloy composition Nd8.82Pr2.94Fe80.00Co1.36Zr1.00B5.88 (atomic percentage) and the auxiliary alloy composition Dy75Al25 (atomic percentage) based on the 2:14:1 phase were respectively designed, and the ingredients were distributed according to the design, where The main alloy considers the burning loss of rare earth Nd 3% (weight percentage), the auxiliary alloy considers the burning loss of rare earth Dy 5% (weight percentage), and the metal raw material with a purity of 99.9wt% is put into a high vacuum melting furnace and melted into an ingot , the control vacuum is 10 -3 Pa, the smelted alloy ingots were put into the hydrogen breaking furnace respectively, the hydrogen flow was 72ml / min, the reaction was 5 hours, and then the jet mill was 3 hours to prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 3.0μm and 1.2μm respectively. Alloy powder, add auxiliary alloy powder with a weight fraction of 2% to the mai...

Embodiment 3

[0028] The NdFeB main alloy composition Nd8.82Pr2.94Fe81.3Al1.00B5.88 (atomic percent) and the auxiliary alloy composition Dy75Tb15Cu10 (atomic percent) based on the 2:14:1 phase were respectively designed, and the ingredients were distributed according to the design, of which the main alloy Consider the burning loss of rare earth Nd 3% (percentage by weight), auxiliary alloy consider the burning loss of rare earth Dy / Tb 5% (percentage by weight), put the metal raw material with a purity of 99.9wt% into a high vacuum melting furnace and melt it into an ingot , the control vacuum is 10 -3 Pa, the smelted alloy ingots were put into the hydrogen breaking furnace respectively, the hydrogen flow was 74ml / min, the reaction was 6 hours, and then the jet mill was 4 hours to prepare the main alloy powder and the auxiliary alloy powder with the average particle size of 2.5μm and 1.0μm respectively. Alloy powder, add auxiliary alloy powder with a weight fraction of 5% to the main alloy p...

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Abstract

The invention discloses a preparation method of a sintered NdFeB magnet with high coercivity. The sintered NdFeB magnet is prepared by taking NdFeB alloy with a positive ratio being 2:14:1 as main alloy and taking rare-earth dysprosium / terbium-copper / aluminum / nickel alloy as auxiliary alloy and by a dual-alloy method, wherein the rare-earth dysprosium / terbium-copper / aluminum / nickel alloy is a liquid-phase sintering additive, is also a grain boundary phase and has favorable wettability with the main phase having the positive ratio being 2:14:1, the rare-earth dysprosium / terbium-copper / aluminum / nickel alloy used as the grain boundary phase is uniformly distributed at a grain boundary of the main phase having the positive ratio being 2:14:1, on one hand, an exchange coupling effect among crystal grains of the main phase is effectively prevented; and on the other hand, Dy / Tb permeations occurs around the crystal grains, the coercivity can be improved, and meanwhile, the residual magnetismand the magnetic energy product are not remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, more specifically, it relates to a preparation method of a sintered NdFeB magnet with high coercive force. Background technique [0002] Sintered NdFeB magnets have been widely used since their invention in 1983 because of their excellent comprehensive magnetic properties. In recent years, with the accelerated development of science and technology and "low-carbon economy", the promotion speed and application scope of sintered NdFeB materials in high-end fields such as wind power, inverter compressors, and hybrid power have expanded rapidly. These fields require that NdFeB magnets not only have high remanence to provide sufficient magnetic storage energy, but also have high enough coercive force to ensure their normal operation at high temperatures. At present, the coercive force of sintered NdFeB is relatively low, which limits the further expansion of its applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/0253H01F41/0266H01F41/0293
Inventor 贺琦军林建强
Owner NINGBO ZHAOBAO MAGNET
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