Rare earth permanent magnet produced by using abundant rare earth La and preparation method thereof

A rare earth permanent magnet, high-abundance technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of insufficient densification, growth of main phase grains, and deterioration of magnetic properties, and reduce the driving force of intergranular corrosion , Improve the coercive force, reduce the effect of potential difference

Active Publication Date: 2013-05-08
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

The La-rich phase is easily oxidized, resulting in insufficient densification during the sintering process. In order to increase the densification, the sintering temperature needs to be increased, but this will lead to further g

Method used

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preparation example Construction

[0023] A kind of preparation method that the present invention provides has applied the rare earth permanent magnet produced by high-abundance rare earth La, and its steps are as follows:

[0024] 1) The main alloy is subjected to vacuum intermediate frequency induction melting, quick-setting scale ingot casting, hydrogen explosion treatment and jet milling to obtain the main alloy powder;

[0025] 2) The grain boundary phase supplementary alloy is subjected to coarse crushing and mechanical ball milling after vacuum intermediate frequency induction melting to obtain grain boundary phase supplementary alloy powder;

[0026] 3) Nano-modified nano-modified grain-boundary alloy powder is obtained by mixing nano-powder and grain-boundary complementary alloy powder, wherein the mass fraction of added nano-powder is 0.001-10%;

[0027] 4) The main alloy powder with a mass percentage of 90-97% and the nano-modified grain boundary phase auxiliary alloy powder with a mass percentage of...

Embodiment 1

[0031] 1) The main alloy is subjected to vacuum intermediate frequency induction melting, quick-setting scale ingot casting, hydrogen explosion treatment and jet milling to obtain main alloy powder. The main alloy is expressed in atomic percentage, and its composition is (Nd 0.89 La 0.1 Ce 0.01 ) 12 Fe 81.85 al 0.3 Si 0.05 B 5.8 ;

[0032] 2) The grain boundary phase-assisted alloy is subjected to vacuum intermediate frequency induction melting, and then coarsely crushed and mechanically ball milled to obtain grain boundary phase-assisted alloy powder. The grain boundary phase-assisted alloy is expressed in atomic percentage, and its composition is Nd 69.8 Cu 30.2 ;

[0033] 3) Mix nano-oxide CuO powder and grain boundary phase alloy powder for nano-modification to obtain nano-modified grain boundary phase alloy powder, wherein the mass fraction of added nano powder is 0.5%;

[0034] 4) Mix the main alloy powder with a mass percentage of 90% and the nano-modified grai...

Embodiment 2

[0037] 1) The main alloy is subjected to vacuum intermediate frequency induction melting, quick-setting scale ingot casting, hydrogen explosion treatment and jet milling to obtain main alloy powder. The main alloy is expressed in atomic percentage, and its composition is (Nd 0.5 La 0.4 Ce 0.05 PR 0.05 ) 16 Fe 75.5 al 0.6 Ga 1.1 co 0.2 Zr 0.05 Nb 0.05 B 6.5 ;

[0038] 2) The grain boundary phase supplementary alloy is subjected to vacuum intermediate frequency induction melting, and then coarsely crushed and mechanically ball milled to obtain grain boundary phase supplementary alloy powder. The grain boundary phase supplementary alloy is expressed in atomic percentage, and its composition is Ce 72 Cu 28 ;

[0039] 3) The nano-oxide SiO 2 The powder is mixed with the grain boundary phase alloy powder for nano-modification to obtain nano-modified grain boundary phase alloy powder, wherein the mass fraction of the added nano powder is 0.001%; ​​4) the main alloy powde...

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PUM

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Abstract

The invention discloses a rare earth permanent magnet produced by using abundant rare earth La and a preparation method of the rare earth permanent magnet. The method is a novel craft concept based on grain boundary reconstruction by atomic percentage, the main alloying component is (Nd1-x-yLaxREy) uFe100-u-v-wMvBw, the grain boundary auxiliary alloying component is R100-zM'z, the design of main alloying component and the craft of powder process aim at promoting phasing and stability of La2Fe14B, high potential elements, higher HA rare earth elements and nanometer powder are added in the compound design of main alloying component so as improve intrinsic corrosion resistance and comprehensive magnetic performance, wherein motive power of intergranular corrosion is reduced by the high potential elements, a hard magnetizing shell layer encircling the main phase boundary is formed by the higher HA rare earth elements in following sintering and technology of heating processing, and a grain boundary phase is modified by the nanometer powder. The rare earth permanent magnet produced by using the abundant rare earth La is capable of reducing cost effectively, and higher comprehensive magnetic performance and corrosion resistance performance of the magnet are guaranteed so as to satisfy market requirements.

Description

technical field [0001] The invention relates to a rare earth permanent magnet produced by using high-abundance rare earth La and a preparation method thereof. Background technique [0002] The reserve of La in the earth's crust ranks third among rare earth elements, second only to Ce and Nd, and is a high-abundance rare earth element; at the same time, La is not in the same period as Sc and Y, and the adjacent Ce is generally positive 4 The valence of La is stable, and it is separated from rare earth elements such as Pr and Nd by Ce. These factors provide convenience for the separation and purification of La; therefore, La is a low-cost and high-abundance rare earth element, and it is mainly used in petroleum sulfidation cracking catalysts. , optical glass for prisms, nickel metal hydride batteries, flints, anti-bending magnesium alloys and other fields. [0003] From the perspective of the application of permanent magnet materials, NdFeB and ferrite have nearly 2 / 3 and 1 / 3...

Claims

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Application Information

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IPC IPC(8): H01F1/053B22F9/04B22F3/16
Inventor 严密金佳莹马天宇梁丽萍张培高翠
Owner ZHEJIANG UNIV
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