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Method multi-field coupling preparation magnetoelectric composite

A magnetoelectric composite material and mixed powder technology, which is applied in the field of magnetoelectric composite materials to achieve the effect of improving magnetoelectric performance

Inactive Publication Date: 2015-04-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical value of the magnetostrictive strain of the bonded Terfenol-D composite material with random orientation is 1200ppm. It is difficult to further improve the magnetostrictive strain of the material by the traditional powder pressing process of a single pressure field.

Method used

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  • Method multi-field coupling preparation magnetoelectric composite
  • Method multi-field coupling preparation magnetoelectric composite
  • Method multi-field coupling preparation magnetoelectric composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put Terfenol-D rare earth giant magnetostrictive material powder less than 250 μm in proportion with epoxy resin E-12 binder and silane (KH550) coupling agent into a closed container and mix uniformly to obtain a mixed powder, in which The weight of the agent is 3% of the weight of the rare earth giant magnetostrictive material powder, and the weight of the coupling agent is 0.1% of the weight of the rare earth giant magnetostrictive powder; put the mixed powder into the forming mold, keep it warm for 1 minute, and apply a prefabricated pressure of 5MPa , wherein the forming mold is kept at room temperature; under a DC magnetic field with an orientation magnetic field of 0 Tesla and a forming pressure of 80 MPa, keep the pressure for 2 minutes to obtain a bonded magnet body; put the bonded magnet body into an 80°C incubator Curing for 2 hours to obtain a bonded magnet; the bonded magnet and the polarized piezoelectric ceramic sheet were glued with 914AB glue produced by ...

Embodiment 2

[0024] Put Terfenol-D rare earth giant magnetostrictive material powder less than 250 μm in proportion with epoxy resin E-12 binder and silane (KH550) coupling agent into a closed container and mix uniformly to obtain a mixed powder, in which The weight of the agent is 50% of the weight of the rare earth giant magnetostrictive material powder, and the weight of the coupling agent is 0.3% of the weight of the rare earth giant magnetostrictive powder; put the mixed powder into the forming mold, keep it warm for 5 minutes, and apply a prefabricated pressure of 5MPa , wherein the forming mold is maintained at 130°C; under a DC magnetic field with an orientation magnetic field of 0 Tesla and a forming pressure of 300MPa, keep the pressure for 20 seconds to obtain a bonded magnet body; put the bonded magnet body at 100°C for heat preservation The bonded magnet was obtained by curing in the box for 24 hours; the bonded magnet and the polarized piezoelectric ceramic sheet were glued wi...

Embodiment 3

[0026] Put Terfenol-D rare earth giant magnetostrictive material powder less than 250 μm in proportion with epoxy resin E-12 binder and silane (KH550) coupling agent into a closed container and mix uniformly to obtain a mixed powder, in which The weight of the agent is 23% of the weight of the rare earth giant magnetostrictive material powder, and the weight of the coupling agent is 0.2% of the weight of the rare earth giant magnetostrictive powder; put the mixed powder into the forming mold, keep it warm for 3 minutes, and apply a prefabricated pressure of 5MPa , wherein the forming mold is kept at room temperature; under a DC magnetic field with an orientation magnetic field of 2 Tesla and a forming pressure of 200 MPa, keep the pressure for 1 minute to obtain a bonded magnet body; put the bonded magnet body into a 90°C incubator Solidified for 12 hours to obtain a bonded magnet; the bonded magnet and the polarized piezoelectric ceramic sheet were glued with 914AB glue produc...

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Abstract

The invention discloses a method of a plurality of fields coupling preparation magnetoelectric composite. The multi-field coupling preparation magnetoelectric composite relates to a method of the magnetoelectric composite, and in particular to the method of force, heat, magnetism multi-field coupling preparation shape magnetoelectric composite. Rare earth super magnetic causing flexible material powder with less than 250Mu Mu granularity and a binder and a coupling agent are placed in a sealing container according to a proportion according to the requirement and are mixed evenly, thus a mixed powder is obtained. A shaping mould with a temperature controlling device is heated up to reserving temperature and the shaping mould is placed in the mixed powder. 5MPa presetting pressure is exerted after the shaping mould is heat preserved for a period of time. A certain oriented magnetic field and a certain shaping pressure are exerted, thus bonding magnet base body is obtained after the oriented magnetic field and the shaping pressure are pressure preserved for a period of time. The bonding magnet basebody is placed in a warm-box and the bonding magnet base body is solidified for a certain time, thus a bonding magnet is obtained. A stratiform magnetoelectric composite is formed by the bonding magnet and piezoelectric ceramic piece of polarization with room temperature solidifying tackiness agent in a gluing mode. The stratiform magnetoelectric composite is placed in a magnetoelectricity testing system to be tested, thus magnetoelectricity performance is obtained. Compared with the prior art, according to the method of a plurality of fields coupling preparation magnetoelectric composite, due to the fact that the force, heat, magnetism multi-field coupling way preparation magnetoelectric composite is adopted, the bonding magnet of a preferred orientation can be prepared, thus the multi-field coupling preparation magnetoelectric composite is beneficial for improving the magnetoelectricity performance.

Description

technical field [0001] The invention relates to a method for a magnetoelectric composite material, in particular to a method for preparing a layered magnetoelectric composite material by multi-field coupling of force, heat and magnetism. Background technique [0002] Magnetoelectric composite material is a new material with magnetoelectric conversion function. It is composed of two single-phase materials - ferroelectric phase and ferromagnetic phase through a certain method. The magnetoelectric conversion function of the magnetoelectric composite material is realized by the product effect of the ferroelectric phase and the ferromagnetic phase, and this product effect is the magnetoelectric effect. During the test if the test surface and the bias magnetic field H DC parallel to the differential magnetic field δH generated by the Helmertz coil, then the measured magnetoelectric coupling coefficient α E / (δH×t)=α E31 , (t is the thickness of the ferroelectric phase) On the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L43/12H10N50/01
Inventor 潘德安张深根左志军王姣田建军
Owner UNIV OF SCI & TECH BEIJING
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