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Method for improving coercive force of Sm5Co19 alloy through step-by-step doping

A coercive force and alloy technology, which is applied in the field of improving the coercive force of Sm-Co permanent magnet alloys, can solve problems such as the inability to effectively improve Sm, and achieve the improvement of coercivity, magnetocrystalline anisotropy, and coercivity. Effect

Active Publication Date: 2013-10-09
北京中联浩科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is for Sm 5 co 19 Due to the special crystal structure, high vacancy rate, and room temperature metastable properties of the alloy, the existing element doping methods cannot effectively improve the Sm 5 co 19 The current status of alloy coercivity, providing a way to increase Sm by stepwise doping elements 5 co 19 Alloy coercivity method

Method used

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  • Method for improving coercive force of Sm5Co19 alloy through step-by-step doping
  • Method for improving coercive force of Sm5Co19 alloy through step-by-step doping
  • Method for improving coercive force of Sm5Co19 alloy through step-by-step doping

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Divide the composition into Sm 5 co 19 The alloy ingot is crushed into a powder below 100 microns, the crushed powder is mixed with the Hf powder according to the molar ratio of 1:0.6, and the mixed powder is put into a ball mill tank according to the mass ratio of ball to material of 45:1, and the ball mill time is 30 Hour;

[0026] (2) Under the protection of inert gas, mix the ball-milled powder obtained in step (1) with multi-walled carbon nanotubes (CNTs) evenly, according to Sm 5 co 19 The molar ratio with multi-walled carbon nanotubes (CNT) is 1:0.4;

[0027] (3) Put the mixed powder in step (2) into the mold, and use spark plasma sintering method for sintering. The process parameters are as follows: first, apply a pressure of 300MPa to the mixed powder in the mold, and then heat it after pressurization, with a heating rate of 50°C / min, after heating up to 550°C, immediately cooling to room temperature without heat preservation, to obtain Sm 5 co 19 f 0...

Embodiment 2

[0029] (1) Divide the composition into Sm 5 co 19 The alloy ingot is crushed into a powder below 75 microns, the crushed powder is mixed with the Hf powder according to the molar ratio of 1:0.4, and the mixed powder is put into a ball milling tank according to the mass ratio of ball to material of 50:1, and the ball milling time is 25 Hour;

[0030] (2) Under the protection of inert gas, mix the ball-milled powder obtained in step (1) with multi-walled carbon nanotubes (CNTs) evenly, according to Sm 5 co 19 The molar ratio with multi-walled carbon nanotubes (CNT) is 1:0.3;

[0031] (3) Put the mixed powder in step (2) into the mold, and use spark plasma sintering method for sintering. The process parameters are as follows: first, apply a pressure of 500MPa to the mixed powder in the mold, and then heat it after pressurization, with a heating rate of 100°C / min, after heating up to 450°C, immediately cool down to room temperature without keeping warm, and get Sm 5 co 19 f...

Embodiment 3

[0033] (1) Divide the composition into Sm 5 co 19 The alloy ingot is crushed into a powder below 90 microns, the crushed powder is mixed with the Hf powder according to the molar ratio of 1:0.4, and the mixed powder is put into a ball mill tank according to the mass ratio of ball to material of 40:1, and the ball mill time is 40 Hour;

[0034] (2) Under the protection of inert gas, mix the ball-milled powder obtained in step (1) with multi-walled carbon nanotubes (CNTs) evenly, according to Sm 5 co 19 The molar ratio with multi-walled carbon nanotubes (CNT) is 1:0.2;

[0035] (3) Put the mixed powder in step (2) into the mold, and use spark plasma sintering method for sintering. The process parameters are as follows: first, apply a pressure of 450MPa to the mixed powder in the mold, and then heat it after pressurization, and the heating rate is 80°C / min, after heating up to 400°C, immediately cooling to room temperature without keeping warm, and obtaining Sm 5 co 19 f ...

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Abstract

The invention provides a method for improving the coercive force of an Sm5Co19 alloy through step-by-step doping, belonging to the technical field of function materials. The method comprises the following steps of: uniformly mixing alloy ingot crushing powder and Hf powder through ball-milling, then uniformly mixing ball-milling powder and multi-walled carbon nanotubes (CNT), and finally, carrying out sinter molding on the mixed powder by using a spark plasma sintering method to obtain an Sm-Co-Hf-CNT series block material taking Sm5Co19 as a substrate. The alloy block material obtained by the method has high coercive force.

Description

technical field [0001] The invention relates to a method for improving the coercive force of Sm-Co permanent magnet alloys, in particular to a method for increasing the coercive force of Sm-Co permanent magnet alloys by doping elements step by step. 5 co 19 The method for alloy coercivity belongs to the technical field of functional materials. Background technique [0002] Among the rare earth-transition metal alloys, the Sm-Co alloy system has become the preferred rare earth alloy system for new high-performance permanent magnetic alloys because of its good intrinsic magnetic properties. However, the existing Sm-Co system permanent magnet alloys still cannot meet the urgent need in the aerospace field to maintain a high level of coercive force when the service temperature reaches 450°C or even higher. [0003] At present, the commonly used method to improve the coercive force of permanent magnetic materials is to dope elements. 2 co 17 Department and SmCo 7 The coerciv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C19/07H01F1/058
Inventor 宋晓艳乔印凯刘东邓韵文
Owner 北京中联浩科技服务有限公司
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