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Rare earth permanent magnet and rare earth permanent magnet preparation method

A rare earth permanent magnet and magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as magnetic performance decline, and achieve the effect of cost control and performance assurance

Inactive Publication Date: 2017-06-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it should also be noted that if the element is partially replaced by Ce alone, the magnetic properties of the magnet will decrease due to various reasons such as magnetic dilution, so we should consider a new composition design to improve the magnetic properties of the magnet containing Ce.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) SC (strip casting: quick-setting scale ingot), HD (hydrogen decrepitation: hydrogen explosion), JM (jet milling: jet mill) process to prepare alloy powder, the alloy is in atomic percentage, its composition for (Nd 0.8 Ce 0.13 La 0.07 ) 12 Fe 82 B 6 ;

[0035] 2) The alloy powder is subjected to magnetic field orientation pressing;

[0036] 3) After the obtained green body is vacuum-packaged, it is subjected to 150MPa cold isostatic pressing for 3 minutes;

[0037] 4) Put the green body into a high vacuum positive pressure sintering furnace, and sinter at 1100°C for 4 hours to make a magnet;

[0038] 5) Perform primary tempering at 920°C and secondary tempering at 620°C;

[0039] 6) Put the prepared magnet into the VSM to measure its magnetic properties, the results are as follows: B r =1.25T,H cj =1784kA / m, (BH) max =304kJ / m 3 .

Embodiment 2

[0041] 1) SC (strip casting: quick-setting scale ingot), HD (hydrogen decrepitation: hydrogen explosion), JM (jet milling: jet mill) process to prepare alloy powder, the alloy is in atomic percentage, its composition for (Nd 0.6 Ce 0.26 La 0.14 ) 15 Fe 78.4 Ga 0.8 Al 0.2 co 0.1 B 5.5 ;

[0042] 2) The alloy powder is subjected to magnetic field orientation pressing;

[0043] 3) vacuum-encapsulate the obtained green body and then press it at 200 MPa for 1 min;

[0044] 4) Put the green body into a high vacuum positive pressure sintering furnace, and sinter at 1060°C for 3 hours to make a magnet;

[0045] 5) Perform primary tempering at 900°C and secondary tempering at 600°C;

[0046] 6) Put the prepared magnet into the VSM to measure its magnetic properties, the results are as follows: B r =1.15T,H cj =1689kA / m, (BH) max =263kJ / m 3 .

Embodiment 3

[0048] 1) SC (strip casting: quick-setting scale ingot), HD (hydrogen decrepitation: hydrogen explosion), JM (jet milling: jet mill) process to prepare alloy powder, the alloy is in atomic percentage, its composition for (Nd 0.5 Ce 0.3 La 0.2 ) 20 Fe 73.1 Ga 0.2 Mo 0.2 B 6.5 ;

[0049] 2) The alloy powder is subjected to magnetic field orientation pressing;

[0050] 3) After the obtained green body is vacuum-packaged, it is subjected to cold isostatic pressing at 200 MPa for 3 minutes;

[0051] 4) Put the green body into a high vacuum positive pressure sintering furnace, and sinter at 1030°C for 2.5h to make a magnet;

[0052] 5) Perform primary tempering at 880°C and secondary tempering at 480°C;

[0053] 6) Put the prepared magnet into the VSM to measure its magnetic properties, the results are as follows: B r =1.19T,H cj =1035kA / m, (BH) max =202kJ / m 3 .

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PUM

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Abstract

The invention discloses a rare earth permanent magnet and a preparation method for the rare earth permanent magnet by controlling Ce valence state by multicomponent rare earth addition and multicomponent alloy micro-mixing. The alloy composition of the rare earth permanent magnet, by atom percentage, is [NdxCeyLazRE1xyz]hFe100hij MiBj, RE is lanthanide except for neodymium and cerium, or scandium and yttrium, Ce is cerium, Fe is iron element, M is at least one of Al, C, Co, Cr, Cu, F, Ga, Mn, Mo, N, Nb, Ni, P, Pb, S, Si, Ta, Ti, V, and Zr. According to the rare earth permanent magnet and the rare earth permanent magnet preparation method, high abundant rare earth Ce is used for partly replacing Nd, the multicomponent rare earth addition and the multicomponent alloy micro-mixing are used for controlling the Ce valence state to make the Ce valence state to approach 3 valence, and therefore the cost control is effectively achieved, and at the same time, the magnet property can be guaranteed.

Description

technical field [0001] The invention relates to the technical field, in particular to a rare-earth permanent magnet and a method for preparing the rare-earth permanent magnet by adjusting the valence state of Ce by applying compound addition of multiple rare earths and micro-doping of multiple alloys. Background technique [0002] The third-generation rare-earth permanent magnet material NdFeB has a high magnetic energy product unmatched by other permanent magnets, so it is known as the "king of permanent magnets" and is an indispensable strategic functional material in various fields of military and civilian in modern society. From 1996 to 2008, the global output of sintered NdFeB increased from 6,000 tons to 63,000 tons, maintaining an average annual growth rate of nearly 10% (YangLuo. Proc. 20th Int. Workshop on Rare Earth Permanent Magnets and Their Applications. 2008, 27). Taking 2010 as an example, the market share of NdFeB in the world's permanent magnets reached 62% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266
Inventor 王新华王征严密金佳莹马天宇
Owner ZHEJIANG UNIV
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