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A method and material for obtaining a magnetostrictive material with low driving field and large magnetic strain

A technology of magnetostrictive materials and magnetostrictive strain, which is applied in the material selection of magnetostrictive devices, the manufacture/assembly of piezoelectric/electrostrictive devices, and the selection of device materials, etc., which can solve the problem of inability to obtain magnetostrictive Material and other issues, to achieve the effect of clear and easy method, small saturation magnetic field and high production yield

Active Publication Date: 2019-08-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these materials are "soft but weak", and the magnetostriction in general polycrystalline materials does not exceed 150ppm, and even for single crystal samples, the magnetostriction is less than 400ppm
[0005] Therefore, the current methods for obtaining large magnetostrictive strains cannot obtain magnetostrictive materials with low driving field and large magnetostrictive strain properties ("strong and soft"), and it is urgent to develop new methods to meet this requirement

Method used

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  • A method and material for obtaining a magnetostrictive material with low driving field and large magnetic strain
  • A method and material for obtaining a magnetostrictive material with low driving field and large magnetic strain
  • A method and material for obtaining a magnetostrictive material with low driving field and large magnetic strain

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Embodiment 1

[0043] This embodiment discloses a method for obtaining a magnetostrictive material with low driving field and large magnetostrictive strain, which includes: reducing the existing micron-scale martensite domains in the material to nano-scale to obtain nano-martensite domains . Further, the above-mentioned nano-martensite domains are obtained by doping normal ferromagnetic martensite materials.

[0044] For this embodiment, it embodies the principles of the present disclosure. The inventors found in their research that the martensitic phase transition that occurs in traditional ferromagnetic shape memory alloys is often a thermodynamic first-order phase transition. After the phase transition occurs, long-range ordered martensitic domains are formed, and the microstructure is expressed as micron twins formed by martensite domains. Although the reorientation effect of the micron-scale martensitic "big" domain driven by a magnetic field will produce a huge amount of magnetostric...

Embodiment 2

[0049] This embodiment discloses the performance and preparation method of a polycrystalline sample of magnetostrictive material with low driving field and large magnetic strain:

[0050] 1. Properties of polycrystalline samples

[0051] This embodiment specifically discloses a polycrystalline sample of a magnetostrictive material with a low driving field and a large magnetic strain, the general chemical formula of which is Fe 100-x PD x . Wherein, the values ​​of x are successively: x=30.5, x=30.8, x=31.3, x=31.8, x=32, x=32.2, x=33. Near the phase transition point of the magnetostrictive material, its magnetostriction coefficient is not less than 90ppm, and the required saturation magnetic field is not greater than 1kOe. In particular, as Figures 3a-3d As shown, when x=30.5, near its phase transition point (~268K), its magnetostriction coefficient can reach 90ppm, and the required saturation magnetic field is not more than 1kOe; when x=32, near the glass transition poin...

Embodiment 3

[0060] This embodiment discloses the performance and preparation method of a directionally solidified sample of a magnetostrictive material with low driving field and large magnetic strain:

[0061] 1. Properties of directionally solidified samples

[0062] This embodiment specifically discloses a directionally solidified sample of a magnetostrictive material with low driving field and large magnetic strain, whose general chemical formula is Fe 100-x PD x . Wherein, the values ​​of x are sequentially: x=30, x=31.3, x=31.8, x=32, x=32.3. Near the phase transition point of the magnetostrictive material, its magnetostriction coefficient is not less than 280ppm, and the required saturation magnetic field is not greater than 1kOe. In particular, as Figures 4a-4e As shown, when x=31.3, its maximum magnetostriction can reach 340ppm at slightly lower than its phase transition point (~212K), and the reversible magnetostriction of subsequent cycles can reach 280ppm, and the require...

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Abstract

The invention discloses a method and material for obtaining magnetostrictive materials with low driving field and large magnetostrictive strain. The strain effect prevails. The present invention also discloses the preparation methods of polycrystalline samples and directional solidification samples of magnetostrictive materials with low driving field and large magnetostrictive strain respectively. By adopting the method, novel magnetostrictive materials with unique low driving field and large magnetostrictive strain properties can be obtained. The material and method are clear and easy to implement, simple and practical; the above preparation method has the advantages of simple process, good repeatability, high production yield, and the obtained Fe 100‑x PD x In terms of performance, the alloy has the characteristics of small saturation magnetic field (saturation magnetic field<1kOe), excellent magnetostriction performance (saturation magnetostriction coefficient>300ppm) and so on.

Description

technical field [0001] The invention relates to the field of magnetostrictive materials, in particular to a method and material for obtaining magnetostrictive materials with low driving field and large magnetostrictive strain. Background technique [0002] Magnetostrictive material is an important functional material for energy and information conversion. Because it can change the length or volume in a magnetic field, it is widely used to make various functional devices including drives, sensors, and transducers. , so it plays an irreplaceable role in high-tech fields such as aerospace, ocean exploration and development, intelligent wings, robots, micro-displacement drives, and fuel injection. [0003] With the advent of the era of human intelligence, devices are required to meet many new requirements such as micronanoization and portability, and these new requirements require magnetostrictive materials to have the function of generating large magnetic strain under low drivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/00C30B28/06C30B29/52H01L41/20H01L41/35H01L41/39
CPCC22C33/06C22C38/005C30B28/06C30B29/52H10N35/85H10N30/09H10N30/093
Inventor 任晓兵任帅杨森薛德祯纪元超
Owner XI AN JIAOTONG UNIV
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