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Preparation method for composite material with magnetic field regulating martensitic transformation

A martensitic transformation and composite material technology, which is applied in the field of preparation of composite materials with magnetic field regulated martensitic transformation, can solve the problem that the magnetic field-induced martensitic transformation in the temperature region is inefficient, affecting the application of materials, Unfavorable materials and other problems, to achieve the effect of widening the temperature range affected by the magnetic field, reducing the complexity of the equipment and increasing the efficiency

Active Publication Date: 2019-01-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are few single materials with magnetic field-controlled martensitic transformation, and the temperature range that can induce the transformation is very narrow
In fact, there are three external conditions that can induce martensitic transformation: temperature, stress and magnetic field. In the traditional method, the stress needs to be loaded on the material through an external device, which is very unfavorable for the application of the material in devices. or not at all
Currently known types of magnetic field-induced martensitic transformation include NiMnIn, MnNiGa-Co, NiMnSn, and MnFePAs. These materials are limited by the inherent magnetic properties of the material itself before and after the phase transformation, so that the temperature range of the magnetic field-induced martensitic transformation changes. is not efficient
Current research has TbFe 1.95 and Mn 2 NiGa adopts powder bonding method to prepare composite materials, but the introduction of binder makes the material components contain impurities, which affects the application of materials

Method used

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  • Preparation method for composite material with magnetic field regulating martensitic transformation
  • Preparation method for composite material with magnetic field regulating martensitic transformation
  • Preparation method for composite material with magnetic field regulating martensitic transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Mn with a sintering temperature of 500°C and a sintering pressure of 25MPa 48 co 4 Ni 28 Ga 20 and Tb 0.27 Dy 0.73 Fe 1.9 Samples with a mass ratio of 20:1.

[0037] The preparation method is as follows

[0038] Step 1: Weigh two groups of metal elements Mn, Co, Ni and Ga, and Tb, Dy and Fe with a purity of 99.99% with an electronic balance;

[0039] The second step: Weigh the good metal element and put it into the electric arc furnace. Pump the vacuum in the electric arc furnace to 2×10 -3 Pa, further up to 1x 10 -6 Fill it with argon after Pa is below;

[0040] The third step: smelting simple metal with electric arc (current is 85A). After repeated smelting for 4 times, uniform ingot-like samples were prepared to obtain Mn 48 co 4 Ni 28 Ga 20 Ingot and Tb0.27 Dy 0.73 Fe 1.9 Ingot casting; (note, the subscript numbers of alloys represent the atomic number ratio)

[0041] The fourth step: the prepared Mn 48 co 4 Ni 28 Ga 20 Spindle same ...

Embodiment 2

[0046] Example 2: Mn with a particle size of 30 microns, a sintering temperature of 500°C, and a sintering pressure of 25 MPa 48 co 4 Ni 28 Ga 20 and Tb 0.27 Dy 0.73 Fe 1.9 Samples with a mass ratio of 20:1.

[0047] The other steps are the same as in Example 1, except that the particle size of the precursor material is changed from 10 microns to 30 microns, and the material obtained under the same other conditions is relatively denser, but the phase change is extremely small.

[0048] The influence efficiency of the magnetic field on the martensitic phase transformation obtained from the MT curve measurement is 6K / T, and the material is a typical magnetic field-induced martensitic phase transformation material. Under the 7T magnetic field, the influence range of the magnetic field on the martensitic transformation is: 46K-88K, and the temperature zone width is 42K.

Embodiment 3

[0049] Example 3: Mn with a particle size of 50 microns, a sintering temperature of 500°C, and a sintering pressure of 25 MPa 48 co 4 Ni 28 Ga 20 and Tb 0.27 Dy 0.73 Fe 1.9 Samples with a mass ratio of 20:1.

[0050] The other steps were the same as in Example 1, except that the particle size of the precursor material was changed from 10 microns to 50 microns, and the material obtained under the same conditions was very densely sintered but the martensitic transformation was small.

[0051] The influence efficiency of the magnetic field on the martensitic phase transformation obtained by MT curve measurement is 1K / T, and the material is a typical magnetic field-induced martensitic phase transition material. Under the 7T magnetic field, the influence range of the magnetic field on the martensitic transformation is: 49K-56K, and the temperature zone width is 7K.

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Abstract

The invention relates to a preparation method for a composite material with magnetic field regulation martensitic transformation. According to the method, two materials of Tb0.27Dy0.73Fe1.9 and Mn48Co4Ni28Ga20 are used, the granularity is uniformly mixed according to different proportions, different sintering temperatures are set, and a plasma sintering method is adopted; and under an external magnetic field, magnetostriction of a rare earth giant magnetostrictive material is taken as stress to induce appreciable martensitic transformation or martensitic variant rearrangement of a ferromagnetic shape memory alloy material. The material prepared by the method can work in a low magnetic field and work when distributed in a 0-380 K temperature region, and the magnetic field has the maximum effect efficiency of 41 K / T on the phase transition temperature.

Description

technical field [0001] The technical solution of the invention relates to the preparation of the martensitic phase change composite material controlled by a magnetic field. Background technique [0002] Magnetic field-induced thermoelastic martensitic transformation can be accompanied by huge changes in strain, electrical resistance, heat absorption and release. The material has important application value in sensors, magnetoresistance devices, and magnetic refrigerants. [0003] However, there are few single materials with magnetic field-controllable martensitic transformation, and the temperature range that can induce the transformation is very narrow. In fact, there are three external conditions that can induce martensitic transformation: temperature, stress and magnetic field. In the traditional method, the stress needs to be loaded on the material through an external device, which is very unfavorable for the application of the material in devices. Or not at all. Curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F1/00C22C22/00C22C28/00C22C1/04
CPCB22F1/0003B22F3/1007B22F3/105C22C1/04C22C22/00C22C28/00
Inventor 刘国栋赵嘉欣代学芳张小明刘何燕宇霄
Owner HEBEI UNIV OF TECH
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