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A kind of preparation method of rare earth permanent magnet with high resistivity

A rare-earth permanent magnet and high resistivity technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., can solve the problems of difficult process operation, limited resistivity, and difficult stable production, etc., to achieve batch stability Production, cheap raw materials, and the effect of improving motor efficiency

Active Publication Date: 2019-05-07
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Most of the above methods increase the resistivity of the magnet by improving the insulation of the magnetic powder particles, but the degree of increasing the resistivity is limited and some process operations are difficult, and it is not easy to achieve stable production.

Method used

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  • A kind of preparation method of rare earth permanent magnet with high resistivity
  • A kind of preparation method of rare earth permanent magnet with high resistivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Nd, Tb, Co, Al, Fe, Cu and ferroboron with a purity of at least 99% by weight are used for high-frequency melting in an argon atmosphere, and the melt is poured onto a quenching roll to make an alloy, and the mass percentage of the alloy is 30% %Nd, 0.5%Tb, 0.8%Co, 0.2%Al, 0.2%Cu, 1%B, and the rest are iron and unavoidable impurities; the alloy is subjected to hydrogen explosion and jet mill grinding to obtain an average particle size of 3.4μm magnetic powder;

[0032] 2) Add 1.5wt% quartz flakes to the magnetic powder and mix them, wherein the average size of the quartz flakes is 0.36-0.29-0.08mm, and the thickness is 0.08mm;

[0033] 3) filling the mixture into a mold, and carrying out orientation pressing under normal temperature and an orientation field environment with a magnetic field strength of 2T;

[0034] 4) Then put the compact into a vacuum sintering furnace, and sinter at a temperature of 1090° C. for 5 hours. After sintering, aging treatment at 510° C...

Embodiment 2

[0037] 1) Nd, Dy, Co, Al, Fe, Cu and ferroboron with a purity of at least 99% by weight are used for high-frequency melting in an argon atmosphere, and the melt is poured onto a quenching roll to make an alloy, and the mass percentage of the alloy is 31.5 %Nd, 0.5%Dy, 1.0%Co, 0.5%Al, 0.2%Cu, 0.92%B, and the rest are iron and unavoidable impurities. The alloy is subjected to hydrogen explosion and jet milling to obtain magnetic powder with an average particle size of 3.0μm ;

[0038] 2) Add 5wt% zirconium oxide flakes to the jet mill magnetic powder and mix them, wherein the average size of the zirconium oxide flakes is 0.23-0.20-0.05mm, and the thickness is 0.05mm;

[0039] 3) filling the mixture of the two into the mold, and carrying out orientation pressing at room temperature and under the environment of an orientation field with a magnetic field strength of 2T;

[0040] 4) Then put the compact into a vacuum sintering furnace, and sinter at a temperature of 1060° C. for 4....

Embodiment 3

[0046] 1) Nd, Dy, Co, Al, Fe, Cu and ferroboron with a purity of at least 99% by weight are used for high-frequency melting in an argon atmosphere, and the melt is poured onto a quenching roll to form an alloy with a mass percentage of 31.2 %Nd, 1.8%Dy, 1.5%Co, 0.4%Al, 0.20%Cu, 1.2%B, and the rest are iron and unavoidable impurities. The alloy is subjected to hydrogen explosion and jet milling to obtain magnetic powder with an average particle size of 3.1μm ;

[0047]2) Add 3.5wt% calcium silicate flakes to the jet mill magnetic powder, wherein the calcium silicate flakes have an average size of 0.28-0.21-0.06mm and a thickness of 0.06mm;

[0048] 3) filling the mixture of the two into the mold, and carrying out orientation pressing at room temperature and under the environment of an orientation field with a magnetic field strength of 2T;

[0049] 4) Then put the compact into a vacuum sintering furnace and sinter at a temperature of 1065° C. for 5.0 hours. After sintering, a...

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Abstract

The invention relates to a preparation method of a high-resistivity rare-earth permanent magnet. The method comprises the following steps that 1, an insulation sheet is added into R1-M-B magnetic powder, wherein R1 is one of or a compound of multiple rare earth elements, M is one of or a compound of multiple of Ti, V, Cr, Mn, Co, Ga, Cu, Si, Al, Zr, Nb, W and Mo, and the insulation sheet is one of or a compound of multiple of quartz, zirconia, aluminum oxide and calcium silicate; 2, a mold is filled with a mixture, obtained in the first step, of the magnetic powder and the insulation sheet, and orientation pressing is conducted; 3, a blank obtained in the second step is sintered, aging treatment is conducted, and the rare-earth permanent magnet is obtained. According to the permanent magnet obtained through the technology, on the premise that the integrity of the appearance of the magnet is guaranteed, and the problem that the electrical resistivity cannot be increased greatly through other methods is solved; the magnet is applied to the high frequency alternating electromagnetic field environment and a motor operating at a high speed, and eddy current loss in the motor can be greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of a magnet, in particular to a preparation method of a rare earth permanent magnet, and belongs to the technical field of magnet preparation technology. Background technique [0002] Since its inception, NdFeB materials have been widely used in many fields such as computers, communications, aerospace, and motors due to their high magnetic energy product and high coercivity, and have become magnetic functional materials with high manufacturing efficiency, small size, and light weight. ideal material for revolutionizing many fields of application. However, due to the characteristics of the NdFeB material itself, its resistivity is low. In the high-frequency alternating electromagnetic field environment and the high-speed motor, the NdFeB magnet will produce obvious eddy current loss, which will cause the temperature of the magnet to rise. , resulting in loss of energy consumption, decline in magnet performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F1/0577H01F41/0266
Inventor 李志强张玉孟魏蕊王聪刘磊
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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