Ultralow residual magnetism temperature coefficient rare-earth permanent-magnet material and preparation method thereof

A rare earth permanent magnet, magnetic temperature technology, applied in magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc. The effect of low remanence temperature coefficient, low production cost and simple process

Inactive Publication Date: 2018-04-17
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to overcome the problems of high temperature coefficient of remanence and low coercive force of sintered permanent magnet materials in the prior art, and provides a rare earth permanent magnet material with ultra-low temperature coefficient of remanence and a preparation method thereof. The sintered NdFeB permanent magnet material with low temperature coefficient of remanence reduces the temperature coefficient of remanence to about -0.06% / ℃, while maintaining high intrinsic coercive force, especially in terms of temperature stability. It can expand the application field of sintered NdFeB materials

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  • Ultralow residual magnetism temperature coefficient rare-earth permanent-magnet material and preparation method thereof

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Effect test

Embodiment 1

[0028] A preparation method of ultra-low remanence temperature coefficient rare earth permanent magnet material, the composition is Nd 28 Dy 4 Fe ball Co 10 Al 0.4 Cu 0.2 Ga 0.3 Nb 0.3 Zr 0.1 B 0.98 The neodymium iron boron permanent magnet material (where ball represents the margin, the same below) is prepared according to the technical scheme of the present invention: after the above-mentioned ingredients are mixed, smelt, shake the sheet, and then the obtained quick-setting sheet is broken by hydrogen , Jet mill crushed into powder with an average particle size of 5 microns. Orient and shape the above powder into a blank under a magnetic field of 2T, apply 300Mpa isostatic pressing to the blank, and then perform vacuum sintering at 1000°C for densification, and then perform primary and secondary tempering processes to finally obtain permanent magnet materials , The measured performance and temperature coefficient are shown in Table 1.

Embodiment 2

[0030] A preparation method of ultra-low remanence temperature coefficient rare earth permanent magnet material, the composition is Nd 28 Dy 2 Fe ball Co 10 Al 0.2 Cu 0.1 Ga 0.1 Nb 0.2 Zr 0.1 B 0.98 The neodymium iron boron permanent magnet material (where ball represents the margin, the same below) is prepared according to the technical scheme of the present invention: after the above-mentioned ingredients are mixed, smelt, shake the sheet, and then the obtained quick-setting sheet is broken by hydrogen , Jet mill crushed into an average particle size of 3 microns to obtain the main phase powder. The secondary alloy composition is Dy 20 Fe ball Cu 1 Al 2 , Smelt, shake the flakes, and crush to an average particle size of 1 micron by ball milling to obtain secondary phase powder. According to the composition range required by the present invention, the above-mentioned two powders are fully mixed in proportions, and at the same time, 0.1% mass fraction of antioxidant is added...

Embodiment 3

[0032] A preparation method of ultra-low remanence temperature coefficient rare earth permanent magnet material, the composition is Nd 28 Dy 2 Fe ball Co 10 Al 0.2 Cu 0.1 Ga 0.1 Nb 0.2 Zr 0.1 B 0.98 The neodymium iron boron permanent magnet material (where ball represents the margin, the same below) is prepared according to the technical scheme of the present invention: after the above-mentioned ingredients are mixed, smelt, shake the sheet, and then the obtained quick-setting sheet is broken by hydrogen Process crushing to obtain the main phase powder with an average particle size of 2 microns. The secondary phase alloy is Dy 20 Fe ball Cu 10 Al 20 The components are smelted, flakes are thrown, and the secondary phase powder with an average particle size of 2 microns is obtained through hydrogen breaking process. According to the composition range required by the present invention, the above two powders are fully mixed, and at the same time 0.5% of the mass fraction of the ...

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Abstract

The invention discloses an ultralow residual magnetism temperature coefficient rare-earth permanent-magnet material and a preparation method thereof. The constituents of the rare-earth permanent-magnet material are LR, HR, Co, M, B and Fe, according to the percent by weight of each constituent, the total weight of the LR and the HR accounts for 29-33%, the Co accounts for 10-22%, the M accounts for 0.75-2.5%, the B accounts for 0.85-1.05%, the balance is Fe, the LR is selected from one or two of Pr and Nd, the HR is selected from arbitrary two of Dy, Tb and Ho, and the M is selected from arbitrary one or more of Al, Cu, Ga, Zr, Nb, Ti, Si, Ge, Sn and Gd. The ultralow residual magnetism temperature coefficient sintered NdFeB permanent-magnet material is prepared by the method, the residualmagnetism temperature coefficient is reduced to about 0.06% per DEG C, meanwhile, high intrinsic coercivity is also maintained, particularly, the sintered NdFeB permanent-magnet material has unique advantages in an aspect of temperature stability, and the application field of the sintered NdFeB material can be expanded.

Description

Technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a rare earth permanent magnet material with ultra-low remanence temperature coefficient and a preparation method thereof. Background technique [0002] Since the invention of sintered NdFeB permanent magnet material in the 1980s, thanks to its high cost performance and the preparation technology basis of sintered samarium cobalt magnets, it has rapidly realized industrialization. Sintered NdFeB permanent magnets are widely used in computer industry, communication industry, audio products, medical and health industry, etc. With the continuous advancement of environmentally friendly industries such as hybrid vehicles and wind power generation, the market demand for sintered NdFeB magnets is also increasing. Sintered NdFeB magnets with high magnetic energy product can promote the development of light, thin, and miniaturized products, and become an indispensable necessity for ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 韩相华章晓峰洪群峰李润峰郝忠彬孙永阳王占州
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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