High-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and preparation process thereof

Abstract

The invention discloses a high-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and a preparation process thereof. Holes are introduced into an Fe73Ga27 alloy by preparing a porous sodium metaaluminate precursor so as to ensure that the magnetostrictive performance of the Fe73Ga27 alloy can be improved; the pore size is 20-100 microns, and the porosity is 30-50%; and the preparation process comprises the following step: performing spray casting in a copper mold by using a vacuum spray casting furnace. According to the high-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and the preparation process thereof disclosed by the invention, the hindering effect of magnetic domain rotation in Fe73Ga27 can be reduced based on introduced pores, the macroscopic foam-state Fe73Ga27 magnetostrictive material can be developed, and large magnetic-induced strain, low driving fields and relatively high mechanical performance can be achieved; and a foam material prepared by using a method disclosed by the invention is uniform in pore, ensures that the magnetostrictive coefficient exceeds 300ppm, also is simple and convenient in process and high in finished product rate, and is beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the field of magnetostrictive materials, and relates to a high-performance macroscopic foam Fe 73 Ga 27 Magnetostrictive material and its preparation process. Background technique [0002] Fe-Ga is a solid solution material formed by Ga atoms and Fe atoms. Its saturation magnetostriction coefficient (single crystal material λs~400 ppm) is more than ten times that of traditional iron-based and nickel-based magnetostrictive materials, and it drives The magnetic field is very low (~100 Oe), only 1 / 10 of that of terb-dysprosium-iron giant magnetostrictive materials. Compared with traditional rare-earth giant magnetostrictive materials, iron-gallium alloys also have good mechanical properties and magnetostrictive temperature stability (the tensile strength is as high as 500 MPa, which is about 23 times that of terbium-dysprosium-iron alloys; the Curie temperature ~ 675°C, which is 300°C higher than that of terbium-dysprosium-iron...

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Problems solved by technology

[0003] In recent years, people have done a lot of research work on Fe-Ga magnetostrictive materials theoretically and experimentally, but the mechanism of the large magnetostriction of Fe-Ga alloys is still unclear, which limits the further development of magnetostrictive properties. improve

[0004] The study found that the effect of Ga on the magnetic moment of Fe is not a simple dilution effect. The atomic magnetic moment of Fe changes with the content of Ga. The increase of the magnetic moment increases the energy density of the alloy, which leads to an increase in the magnetostrictive strain of the alloy.

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