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Rareearth super magnetostrictive material with wide temp. range

A giant magnetostrictive, wide temperature technology, applied in the field of new materials, rare earth giant magnetostrictive materials, can solve the problems of magnetostrictive performance reduction, unusable, magnetostrictive performance decline, etc.

Inactive Publication Date: 2004-01-07
BEIHANG UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the spin reorientation occurs, the magnetostrictive performance of the alloy suddenly decreases, and it cannot be used
In addition, the existing giant magnetostrictive materials have a large temperature coefficient above room temperature, and the magnetostrictive performance decreases rapidly as the temperature rises. Currently, the operating temperature is not higher than 80°C.

Method used

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Embodiment Construction

[0013] The present invention is a rare earth giant magnetostrictive material with a wide temperature range, by adjusting the ratio of Tb and Dy elements in the alloy, and adding alloy elements Co, Al, Mn, etc., to change the spin reorientation temperature of the alloy, and reduce the supermagnetic The temperature coefficient of the stretchable material.

[0014] Alloy composition of the present invention and atomic ratio thereof are:

[0015] Tb 0.4 Dy 0.6 (Fe, Co, Al, Mn) 1.90

[0016] A kind of wide temperature range rare earth giant magnetostrictive material of the present invention, the process route of its manufacturing method is: process route is:

[0017] (1) Using 99.9% of high-purity rare earth elements Tb and Dy, and elements of Fe, Co, Al, and Mn with a purity of more than 99%, the target composition is Tb 0.4 Dy 0.6 (Fe, Co, Al, Mn) 1.90 master alloy;

[0018] (2) Smelted in a vacuum induction furnace, the vacuum degree of the back and bottom reaches 10 -2...

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Abstract

A wide temperature sphere rare earth super magnetostrictive material is made by adjusting the proportion of Tb and Dy elements in alloy adding Co, Al, Mn to change alloy spin and orientation temperature, then reducing its temperature coefficient. Composition and propoertion: Tb0.3-0.5Dy0.5-0.7(fe, Co, Al, Mn) 1.90-1.95, technical process: (1) applying 99.9% high pure rare earth elements Tb and Dy and elements over 99.9%, Fe, Co, Al, Mn to be prepared to the target composition of Tb0.3-0.5Dy0.5-0.7(Fe, Co, Al, Mn) 1.90-1.95(2) vacuum degree of the back base reaches to 10 to the power-2 - 10 to the power -3 Pa metal in vacuum inductive oven to be filled by Ar to 0.3-0.7x10 to the poower 5 Ps to get a mother rod material (3) orientation crystal is prepared after zone, melt directional solidification, controlling zone length.

Description

(1) Technical field: [0001] The invention provides a wide temperature range rare earth giant magnetostrictive material, which belongs to the new material technology. (two) background technology: [0002] Rare earth giant magnetostrictive material is a new type of functional material, which can quickly realize the energy conversion between magnetic (electric) energy and mechanical (sound) energy. Now the composition of terbium dysprosium iron (TbDyFe) giant magnetostrictive material is Tb 0.3 Dy 0.7 Fe 1.9-1.95 , its magnetocrystalline anisotropy is low, and it can realize a large magnetostrictive effect under low field. However, there is an electron spin reorientation around -20℃ in this alloy, and its easy magnetization direction changes from <111> direction at high temperature to <100> direction at low temperature. The magnetostriction coefficient λ of the alloy along the <111> direction 111 =1600ppm (ppm=10), the magnetostriction coefficient λ along...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00H10N35/85
Inventor 蒋成保徐惠彬宫声凯
Owner BEIHANG UNIV