Preparation method of sintered rare-earth giant magnetostrictive material

A magnetostrictive material, giant magnetostriction technology, applied in the direction of material selection for magnetostrictive devices, device material selection, etc., can solve the problems of high sintering temperature, easy oxidation, high rare earth content, etc., to reduce the sintering temperature , Improving the magnetostrictive performance and improving the effect of density

Inactive Publication Date: 2019-05-28
GRIREM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current preparation methods of sintered magnetostrictive materials generally have certain problems.
First of all, the preparation process of sintered materials requires the use of powdered materials, and rare earth giant magnetostrictive materials have high rare earth content and are easily oxidized, so the control of oxygen content in the preparation process has become a difficult point; secondly, due to the lack of liquid phase, not only is it difficult to ensure the density of the final material, but also the sintering temperature is high, which affects the final performance of the sintered magnetostrictive material

Method used

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preparation example Construction

[0022] The invention relates to a preparation method of a sintered rare earth giant magnetostrictive material, comprising the following steps:

[0023] S1 Mix and crush the magnetostrictive material and binder to obtain raw powder;

[0024] S2 Orientate the raw powder to obtain a billet;

[0025] S3 heat-treating the billet and removing the binder;

[0026] The composition of the magnetostrictive material in step S1 is RT x , where R is one or more of Tb, Dy, Sm, Ho, Pr, T is Fe or / and Co, in terms of atomic ratio, 1.5≤x≤2.3, with RT 2 As the main phase, the RT2 phase preferably accounts for more than 95% of the whole. The particle size of the raw powder is preferably 30-100 μm, which is more conducive to the performance of the product.

[0027] In the above material composition, in order to achieve better magnetostrictive performance, R is one or more of Tb, Dy, Sm, Ho, Pr, and T is Fe or / and Co; wherein the addition of Co is mainly to improve the material Curie temperat...

Embodiment 1

[0040] (1) Tb, Dy and Fe are measured according to the formula Tb 0.3 Dy 0.7 Fe 1.95 Proportionally smelted and cooled to obtain an alloy.

[0041] (2) After the alloy is coarsely crushed, mixed with polyethylene glycol, it is put into a ball mill tank for ball milling, the ball milling medium is acetone, and the content of polyethylene glycol is 30 vol.%. After the ball is milled, it is taken out, and the acetone is volatilized to obtain the original magnetostrictive powder.

[0042] (3) The raw powder is put into a mold, oriented in a magnetic field of 1.2T, pressed and formed under a pressure of 5 MPa, and then isostatically pressed under a pressure of 200 MPa to obtain a billet.

[0043] (4) Put the billet into heat treatment and binder removal furnace for sintering, the maximum sintering temperature is 950°C, and the sintering atmosphere is N 2 , N 2 The pressure is 60kPa, and the sintering time is 5h. After the heat treatment is completed, it is naturally cooled to...

Embodiment 2

[0046] (1) Tb, Dy and Fe are measured according to the formula Tb 0.3 Dy 0.7 Fe 1.92 Proportionally smelted and cooled to obtain an alloy.

[0047] (2) After the alloy is coarsely crushed, mixed with polyethylene glycol, it is put into a ball mill tank for ball milling, the ball milling medium is acetone, and the content of polyethylene glycol is 20 vol.%. After the ball is milled, it is taken out, and the acetone is volatilized to obtain the original magnetostrictive powder.

[0048] (3) The raw powder is put into a mold, oriented in a magnetic field of 3.0T, pressed under a pressure of 5 MPa, and then isostatically pressed under a pressure of 200 MPa to obtain a billet.

[0049] (4) Put the billet into heat treatment and binder removal furnace for sintering, the maximum sintering temperature is 1050°C, and the sintering atmosphere is N 2 , N 2 The pressure is 60kPa, and the sintering time is 5h. After the heat treatment is completed, it is naturally cooled to room temp...

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Abstract

The invention discloses a preparation method of a sintered rare-earth giant magnetostrictive material. The preparation method of the sintered rare-earth giant magnetostrictive material is characterized by comprising S1 a magnetostrictive material and a binder are mixed and crushed to obtain raw powder; S2 orientation forming is conducted on the raw powder to obtain a blank material; S3 heat treatment is conducted on the blank material and the binder is removed; and the magnetostrictive material is formed by RTX, wherein R is one or more of Tb, Dy, Sm, Ho and Pr, T is Fe or / and Co, X is greaterthan or equal to 1.5 and less than or equal to 2.3 based on the atomic ratio, and RT2 is used as a main phase. The method can reduce the sintering temperature of the sintered magnetostrictive material, so that the density of the material is improved, and the magnetostrictive property of the material is improved.

Description

technical field [0001] The invention relates to the field of rare earth functional materials, in particular to a preparation method of sintered rare earth giant magnetostrictive materials. Background technique [0002] Due to the change of the magnetization state at room temperature, its length and volume will change greatly, that is, the magnetostrictive material with a large magnetostrictive coefficient is called a giant magnetostrictive material (Giant Magnetostrictive Material, referred to as GMM). Among them, the magnetostriction of rare earth and transition metal intermetallic compound magnetostrictive materials is nearly a hundred times that of traditional magnetostrictive materials, and they are called rare earth giant magnetostrictive materials. Rare earth giant magnetostrictive material is a new type of magnetostrictive material. Compared with traditional magnetostrictive materials, this material has a large magnetostrictive coefficient at room temperature, which c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C19/07C22C33/02C22C38/10H01L41/20
Inventor 罗阳彭海军卢硕权宁涛杨远飞豆亚坤于敦波闫文龙
Owner GRIREM ADVANCED MATERIALS CO LTD
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