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

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

Active Publication Date: 2015-06-10
HEBEI UNIV OF TECH
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  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0023] (4) Clean the surface...

Embodiment 2

[0028] The other steps of this example are the same as Example 1, the difference is that 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 is 10mm in diameter and 40mm in length; the magnetic field heat treatment in step (6) is 350kA / m, 300°C, and 0.5 hours.

[0029] From attached figure 2 It can be seen that Tb 0.26 Dy 0.65 Ho 0.09 Fe 2 The magnetostriction of the material (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] From attached image 3 It can be seen that Tb 0.26 Dy 0.65 Ho 0.09 Fe 2 The magnetostriction of the material in the direction perpendicular to the magnetic field is -240×10 under a magnetic field of 200kA / m-6 , the magnetostrictive hysteresis of the material in the r...

Embodiment 3

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

[0034] From 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 small, resulting in an improved magnetostrictive hysteresis characteristic of the material.

[0035] The invention can change the distribution of magnetic domains in the material under the combined action of the magnetic field and temperature by performing magnetic field heat treatment on the material. After magnetic field heat treatment, some magnetic domains in the material will be aligned along the direction of the applied magnetic field. For example, for a rod-s...

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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 material science and engineering, in particular to a preparation method of a rare earth iron giant magnetostrictive material, in particular to the obvious improvement of the magnetostriction and hysteresis characteristics of the rare earth iron giant magnetostrictive material. technical background [0002] Rare earth iron giant magnetostrictive material is a new type of functional material that can produce huge stretching deformation under a magnetic field. It has the characteristics of large magnetostriction, high energy density, and fast response speed. It has been widely used in energy devices and sensors. At present, the preparation methods of rare earth iron giant magnetostrictive materials mainly include directional solidification, sintering and bonding. The directional solidification method can prepare materials with large magnetostriction, but there are problems such as complicated preparation process, hig...

Claims

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Application Information

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Patent Type & Authority Patents(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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