Magnetic-electric composite material and preparation method thereof

Abstract

The invention discloses a magnetic-electric composite material and a preparation method thereof. The composite material has a composite structure formed by compounding a radially-polarized ring-shaped piezoelectric material, a negative magnetostriction layer and a positive magnetostriction layer. The preparation method comprises the following steps of: firstly, performing deposition of the positive magnetostriction layer on the ring-shaped piezoelectric material; secondly, polishing and removing the positive magnetostriction layer on the outer side of the piezoelectric material by using a piece of metallographic abrasive paper; thirdly, sealing the inner side of a ring by using a waterproof heat-resistant silicone rubber, and performing deposition of the negative magnetostriction layer on the outer surface; and finally, performing polarization after removing the silicon rubber to obtain the magnetic-electric composite material. According to the magnetic-electric composite material and the preparation method thereof, through co-extrusion on the ring-shaped piezoelectric material by positive and negative magnetostriction materials in different positions, compared with a ring-shaped magnetic-electric composite material which is made of a single positive magnetostriction material with the same type or a ring-shaped magnetic-electric composite material which is made of a single negative magnetostriction material with the same type, the interlayer force transmission is enhanced, and the magnetic-electric composite material has a greater magnetic-electric effect.

Description

technical field [0001] The invention relates to the technical field of magnetoelectric composite material with giant magnetoelectric effect and its preparation. In particular, it relates to a three-layer annular magnetoelectric composite material of negative magnetostrictive material / piezoelectric material / positive magnetostrictive material and a preparation method thereof. Background technique [0002] Magnetoelectric composite material is a new type of functional material formed by compounding ferroelectric phase and ferromagnetic phase through a certain method. It not only has the piezoelectric effect of the former and the magnetostrictive effect of the latter, but also produces new magnetic properties. Electric conversion effect. Magnetoelectric composite materials have great potential application prospects in sensors, magnetic field detection, magnetoelectric energy conversion, intelligent filters, magnetic recording, etc. The layered magnetoelectric materials develop...

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Problems solved by technology

There is a partial offset between these two stresses, which weakens the stress transfer from the magnetostrictive layer to the piezoelectric layer, and cannot significantly improve the magnetoelectric conversion coefficient.

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