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Magnetoelectric composite material and preparation method thereof

A magnetoelectric composite material and air piezoelectric technology, which is applied in the selection of materials, the manufacture/processing of electromagnetic devices, etc., can solve the problem of difficult adjustment of magnetic phase volume fraction, composite materials without piezoelectricity, and low magnetostrictive phase Resistance and other issues, to achieve significant magnetoelectric effect, good magnetoelectric effect effect

Active Publication Date: 2014-04-30
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned improved magnetoelectric composite material structure, T. Mitsui pointed out in his monograph (An introduction to the physics of ferroelectric) that the magnetostrictive phase generally has a lower resistance, and the leakage phenomenon will exist if the volume fraction is too high. Due to the conductivity of the Terfenol-D particles for the magnetoelectric composite prepared by the cut-and-fill method, adding too much Terfenol-D particles will form a percolation channel and cause the composite material to change from an insulator to a conductor, so that the composite material does not have piezoelectricity. At the same time, there is no magnetoelectricity. Studies by Nan C W and others have shown that the magnetic phase percolation threshold for random particle composites is generally around 0.16, so the volume fraction of Terfenol-D particles is generally limited to within 16%, and Shizhan et al. It is theoretically pointed out that the maximum magnetoelectric coefficient appears when the volume fraction of magnetic particles is around 0.4
Therefore, in order to increase the magnetoelectric coefficient of the magnetoelectric composite material, the volume fraction of the magnetoelectric phase must be increased, and for the traditional 1-3 type magnetoelectric composite material, the excessive volume fraction of the magnetoelectric phase will form a percolation channel and make the composite material become The conductor thus loses the magnetoelectric effect, so it is difficult for the traditional 1-3 type magnetoelectric composite to adjust the volume fraction of the magnetic phase. Based on this, it is impossible to further improve the 1-3 type magnetoelectric composite by adjusting the volume fraction of the magnetic phase about performance

Method used

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  • Magnetoelectric composite material and preparation method thereof
  • Magnetoelectric composite material and preparation method thereof
  • Magnetoelectric composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] (1) Preparation of PZT annular green body

[0035]Using PZT-5A powder as raw material, adding glycerol as a plasticizer, adding polyvinyl alcohol as a binder, and using viscous plastic processing technology to obtain a slurry with high solid content. The mass ratio of PZT-5A powder, polyvinyl alcohol binder and glycerol plasticizer is 30:4:1. Extrude the slurry to obtain a hollow PZT green body, the outer diameter of the green body is 20 mm, the inner diameter is 15 mm, and the inner wall of the PZT green body is coated with platinum slurry.

[0036] (2) Preparation of carbon black green body

[0037] Using acetylene black powder as raw material, adding glycerol as a plasticizer, adding polyvinyl alcohol as a binder, and using viscous plastic processing technology to obtain a slurry with high solid phase content. Wherein the mass ratio of carbon black, polyvinyl alcohol binder and glycerol plasticizer is 30:4:1. Slurry is extruded to make cylindrical carbon black gre...

Embodiment 2

[0047] Using textured PMN-PT powder and acetylene black as raw materials, obtain hollow piezoelectric fibers according to the co-extrusion process described in Example 1, wherein the inner diameter of the obtained hollow piezoelectric fibers is 80 μm, and the outer diameter is 200 μm. The fibers were polarized in silicone oil at 100°C for 30 min at a polarizing electric field of 3 kV / mm. The magnetostrictive particle Terfenol-D is mixed with E-42 epoxy resin, wherein the particle size of Terfenol-D particle is 40 μm, NiFeO 4 The volume fraction in the mixture is 51%. The above-mentioned hollow piezoelectric fiber is erected vertically in a paraffin mold of 3mm*3mm*10mm, and the mixture of magnetostrictive particles and epoxy resin is filled into the mold, cured at a vacuum degree of 40kPa for 18h, and the magnetoelectric fiber is obtained after mechanical processing. composite material. The obtained performance: the maximum value of the magnetoelectric conversion coefficient...

Embodiment 3

[0049] Using PZT-5A powder and acetylene black as raw materials, obtain hollow piezoelectric fibers according to the co-extrusion process described in Example 1, wherein the inner diameter of the obtained hollow piezoelectric fibers is 273 μm, and the outer diameter is 610 μm. Polarize in silicone oil for 30min at a polarization electric field of 3kV / mm. Firstly, the magnetostrictive particles Terfenol-D and FeBSiC were mixed together with E-42 epoxy resin, wherein the particle size of Terfenol-D was 40 μm, the particle size of FeBSiC was 45 μm, and the volume fraction of Terfenol-D in the mixture was 35%, and the volume fraction of FeBSiC in the mixture is 30%. The above-mentioned hollow piezoelectric fiber is erected vertically in a 3mm*3mm*10mm paraffin mold, and the mixture of magnetostrictive particles and epoxy resin is filled into the mold, cured at a vacuum degree of 40kPa for 12h, and the magnetoelectric fiber is obtained after mechanical processing. composite materi...

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Abstract

The invention relates to a magnetoelectric composite material and a preparation method thereof. An adopted piezoelectric fiber is of a hollow structure and polarized in the radial direction. Except for one end of the piezoelectric fiber, a mixture of magnetostriction particles and resin fills the hollow structure of the piezoelectric fiber and the portion outside the piezoelectric fiber, the interior and the exterior of the piezoelectric fiber are coated with electrode materials, and an annular electrode belt which is not coated is arranged on the outer surface of one end of the piezoelectric fiber. The magnetoelectric composite material based on the hollow piezoelectric fiber is successfully prepared for the first time for overcoming the shortcomings of an existing magnetoelectric composite material. According to the obtained magnetoelectric composite material, the adjustable range of the volume fraction of the magnetic phase is large, and the contact area of the magnetic phase and the piezoelectric phase is large. When the volume fraction of the magnetostriction particles is increased, the composite material is prevented from being changed into a conductor from an insulator. The magnetoelectric composite material can be well applied to the magnetoelectric sensor field, the intelligent filter field, the high-density magnetic recording field and the like.

Description

technical field [0001] The invention relates to a novel magnetoelectric composite material. In particular, it relates to a method for preparing a novel magnetoelectric composite material by using a hollow piezoelectric fiber. Background technique [0002] Magnetoelectric material is a new type of functional material with magnetoelectric effect. It has both ferromagnetic and piezoelectric properties. It has great applications in many fields such as magnetic sensing, magnetic storage and magnetic recording, magnetic imaging technology, and multi-state memory elements. potential has attracted extensive attention in recent years. [0003] According to the composition of magnetoelectric materials, they can be divided into single-phase magnetoelectric materials and magnetoelectric composite materials. Single-phase magnetoelectric materials are magnetoelectric materials with magnetoelectric effect composed of only one constituent phase, while magnetoelectric composite materials r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L43/10H01L43/12H10N50/01
Inventor 张斗朱松林秀娟陈子琪周科朝
Owner CENT SOUTH UNIV
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