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A high-corrosion-rich high-abundance rare earth permanent magnet and its preparation method

A rare earth permanent magnet, high abundance technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high melting point, poor grain boundary bonding, etc., to achieve a simple process, increase the proportion, Increase the effect of application volume

Active Publication Date: 2021-01-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the particle size of Cu powder is much smaller than the grain size of the main phase, it can be well wrapped around the main phase, greatly increasing the electrode potential of the grain boundary phase of the magnet, and improving the corrosion resistance of the magnet, but the melting point of Cu is higher. (1083°C), higher than the usual sintering temperature of 1065°C, therefore, it is difficult for Cu to fully react with the rare earth-rich phase at the grain boundary, resulting in poor grain boundary bonding

Method used

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  • A high-corrosion-rich high-abundance rare earth permanent magnet and its preparation method
  • A high-corrosion-rich high-abundance rare earth permanent magnet and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0037] The main phase alloy is divided into nominal composition (La 0.2 Ce 0.3 PR 0.1 Nd 0.4 ) 31 Fe 67 Z 1.0 B 1.0 The wt.% ratio is weighed, and the alloy powder is prepared by induction melting, quick-setting casting, hydrogen explosion and jet milling. The average particle size of the powder is about 3.5 μm, where Z is Al=0.2, Co=0.3, Cu= 0.4, Ga=0.1;

[0038] The auxiliary alloy is divided into nominal composition (Ce 0.8 PR 0.1 Nd 0.1 ) 56 Fe 44 wt.% proportioning and weighing, induction melting, alloy 800°C vacuum homogenization heat treatment for 10 hours, mechanical crushing, jet milling powder, the average particle size of the powder is about 1.0 μm;

[0039] The obtained main phase alloy powder and auxiliary alloy powder are placed in a mixer in a protective atmosphere (nitrogen or argon) according to a certain ratio, and 0.05% of antioxidant is added at the same time, and uniformly mixed for 0.5-1.0h. Wherein, the mass percent of MM-Fe auxiliary alloy ...

Embodiment 2

[0048] The main phase alloy is weighed according to the nominal composition (La0.1Ce0.4Pr0.1Nd0.4)28.5Fe69.5N1.0B1.0wt.%, prepared by induction melting, quick-setting casting, hydrogen explosion and jet milling Alloy powder, the average particle size of the powder is about 3.5μm, where N is Al=0.2, Cu=0.5, Zr=0.1, Nb=0.1, Ga=0.1;

[0049] The auxiliary alloy is weighed according to the nominal composition of Ce56Fe44wt.%, and the alloy is subjected to induction melting, vacuum homogenization heat treatment at 800 °C for 10 hours, mechanical crushing, high-energy ball milling, and the average particle size of the powder is about 0.8 μm;

[0050] The obtained main phase alloy powder and auxiliary alloy powder are placed in a mixer in a protective atmosphere (nitrogen or argon) according to a certain ratio, and 0.05% of antioxidant is added at the same time, and uniformly mixed for 0.5-1.0h. Wherein, the mass percent of Ce-Fe auxiliary alloy powder is 5%;

[0051] The uniformly ...

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Abstract

The invention belongs to the technical field of permanent magnet materials, in particular to a high-corrosion-rich and high-abundance rare earth permanent magnet and a preparation method thereof. A high-corrosion-rich and high-abundance rare-earth permanent magnet includes a ferromagnetic phase and a grain boundary-rich rare-earth phase, wherein the ferromagnetic phase is an MM-Fe-B phase, and the grain-boundary rare-earth-rich phase is an MM-Fe phase. A kind of method for preparing above-mentioned permanent magnet, described method prepares MM-Fe-B main phase alloy and MM-Fe auxiliary alloy respectively by double-alloy process, respectively smelting, pulverizing by crushing; The prepared MM-Fe auxiliary alloy The alloy powder is added to the main alloy in a proportion of 1%-5% by mass and mixed evenly; orientation pressing, sintering, and heat treatment are performed to obtain a final sintered magnet. The introduction of MM-Fe at the grain boundary can not only optimize the distribution of the rare earth-rich phase at the grain boundary, partially replace the original erodible grain boundary phase, and improve the intrinsic corrosion resistance of the MM-Fe-B magnet, but also this method further improves the low-cost The proportion of rare earth La / Ce in the magnet reduces the cost of materials, and the process is simple, which is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, in particular to a high-corrosion-rich and high-abundance rare earth permanent magnet and a preparation method thereof. Background technique [0002] Neodymium iron boron (Nd-Fe-B) permanent magnet material is currently the most magnetic and widely used magnetic functional material. After more than 30 years of development since its discovery in 1984, Nd-Fe-B permanent magnets are widely used in hybrid vehicles and Wind turbines, etc., have become indispensable important functional materials for high-tech industries. At the same time, Nd-Fe-B permanent magnets are also the materials that consume the most rare earths, and the annual consumption of rare earths is close to half of the total amount of rare earths used in my country. In recent years, the downstream industry's demand for Nd-Fe-B permanent magnets has grown by leaps and bounds. Nd-Fe-B magnets are highly dependent on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
Inventor 张玉晶姚旻皓徐锋缪雪飞
Owner NANJING UNIV OF SCI & TECH
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