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Preparing method of Tb-Dy-Ho-Fe giant magnetostrictive material

A tb-dy-ho-fe, giant magnetostrictive technology, applied in the field of materials science and engineering, can solve the problems of high cost, large magnetostrictive hysteresis, complex preparation process, etc. The effect of small hysteresis and simple preparation process

Active Publication Date: 2013-12-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a preparation method of rare earth iron giant magnetostrictive materials in view of the problems of complex preparation process, high cost and large magnetostrictive hysteresis existing in the current rare earth iron giant magnetostrictive materials

Method used

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  • Preparing method of Tb-Dy-Ho-Fe giant magnetostrictive material
  • Preparing method of Tb-Dy-Ho-Fe giant magnetostrictive material
  • Preparing method of Tb-Dy-Ho-Fe giant magnetostrictive material

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Embodiment 1

[0020] (1) Clean the surface of Tb, Dy, Ho and Fe metal bulk materials with a purity of 99.9%, apply pressure to make Tb, Dy and Ho bulk materials into particles with a particle size of less than 5mm, and remove Fe metal bulk materials Make particles with a particle size of less than 3mm to ensure the uniform composition of the molten alloy.

[0021] (2) According to the molar ratio Tb: Dy: Ho: Fe = 0.26: 0.53: 0.21: 1.9, the mixture is put into the sweet pot of the electric arc furnace, and the electric arc furnace is first vacuumed up to 5×10 -3 Above Pa, flush with high-purity argon twice, and then smelt under the protection of high-purity argon. The smelting current is 140-160 amperes and the time is 20-30 seconds. Then, the alloy ingot is turned over and smelted twice.

[0022] (3) Cast the smelted alloy into a mold with a diameter of 8mm and a length of 30mm to make an alloy bar of 8mm and a length of 30mm.

[0023] (4) Clean the surface of the prepared alloy rod, wrap it with ...

Embodiment 2

[0028] The other steps of this embodiment are the same as those of embodiment 1, the difference is: the molar ratio of the metal used in step (1) is changed to Tb: Dy: Ho: Fe=0.26: 0.65: 0.09: 2; the mold in step (3) The size becomes 10mm in diameter and 40mm in length; the magnetic field of the magnetic field heat treatment in step (6) is 350kA / m, the temperature is 300°C, and the time is 0.5 hours.

[0029] Attached figure 2 It can be seen that Tb 0.26 Dy 0.65 Ho 0.09 Fe 2 Material magnetostriction (λ ∥ -λ ⊥ ) Is close to saturation under 400kA / m magnetic field, which is 1160×10 -6 , 770×10 under 200kA / m magnetic field -6 , The magnetostrictive hysteresis of the material in the range of 0-300kA / m is very small, and the hysteresis width is 6.3kA / m.

[0030] Attached image 3 It can be seen that Tb 0.26 Dy 0.65 Ho 0.09 Fe 2 The magnetostriction of the material perpendicular to the magnetic field is -240×10 under a 200kA / m magnetic field -6 , The magnetostrictive hysteresis of the...

Embodiment 3

[0033] The other steps of this embodiment are the same as those of embodiment 1, and the difference is that the molar ratio of the metal used in step (1) is changed to Tb:Dy:Ho:Fe=0.26:0.48:0.26:2. The alloy rod in step (5) is axially applied with a compressive stress of 10 MPa; the temperature of the magnetic field heat treatment in step (6) is 270° C. and the time is 0.5 hours.

[0034] Attached Figure 4 It can be seen that Tb 0.26 Dy 0.48 Ho 0.26 Fe 2 The magnetization of the material and the hysteresis of the magnetic field are very small, resulting in improved magnetostrictive hysteresis characteristics of the material.

[0035] In the present invention, the magnetic field heat treatment of the material can change the magnetic domain distribution in the material under the combined action of the magnetic field and the temperature. After the magnetic field heat treatment, part of the magnetic domains in the material will be aligned along the direction of the applied magnetic f...

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Abstract

The invention provides a preparing method of a Tb-Dy-Ho-Fe giant magnetostrictive material. The material comprises the components of Tb1-x-yDyxHoyFez, wherein x is 0.45-0.65, y is 0.08-0.25, and z is 1.9-2.0. The preparing method comprises the steps that first, metal raw materials are mixed, electric arc melting is conducted on the metal raw materials to obtain an alloy ingot, then the alloy ingot is poured and cast, high-temperature homogenizing annealing is conducted, and a furnace is cooled to be at an indoor temperature; then, magnetic heat treatment of stress is applied under the protection of high-purity argon, and at last the tombarthite iron giant magnetostrictive material is obtained. According to the preparing method of the Tb-Dy-Ho-Fe giant magnetostrictive material, the combined action of the stress, a magnetic filed and the temperature is used for adjusting magnetic domain distribution of rod-shaped materials, magnetic domains in the material are oriented according to a certain direction, the magnetic domain structure of the material is optimized, magnetostrictive hysteresis of the material is obviously reduced, the magnetostriction and magnetic field curves are in linear relation, and saturated magnetostriction is increased.

Description

Technical field [0001] The invention belongs to the field of materials science and engineering, and is specifically a method for preparing rare earth iron super magnetostrictive materials, and particularly relates to the obvious improvement of the magnetostriction and hysteresis characteristics of rare earth iron super magnetostrictive materials. technical background [0002] Rare-earth iron giant magnetostrictive material is a new type of functional material that can produce huge expansion and contraction under a magnetic field. It has the characteristics of large magnetostriction, high energy density, and fast response speed. Therefore, it is used in precision control systems and high-power ultrasound. Energy devices, sensors and other aspects are widely used. At present, the preparation methods of rare earth iron giant magnetostrictive materials mainly include directional solidification method, sintering method and bonding method. The directional solidification method can pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/04
Inventor 王博文吕岩孙英赵智忠李国禄
Owner HEBEI UNIV OF TECH
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