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Three-component compound magnetoelectric material using organic polymer as adhesive and its preparation method

A technology of organic polymers and magnetoelectric materials, applied in the manufacture/assembly of magnetostrictive devices, the manufacture/assembly of piezoelectric/electrostrictive devices, circuits, etc., can solve the difficulties in the preparation and processing of Terfenol-D sheets, PZT sheet processing difficulty, difficult processing and other problems, to achieve the effect of convenient molding, good mechanical properties of materials, high magnetoelectric conversion coefficient

Inactive Publication Date: 2003-02-05
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the University of Pennsylvania has obtained a high value of 5.9V / cm Oe, it has obvious disadvantages: (1) The preparation and processing of Terfenol-D sheets are difficult
(2) The preparation of PZT has to go through two high-temperature sinterings, the cycle is long, and the difficulty of processing the ceramic itself leads to the difficulty of processing PZT sheets
(3) The interface connection problem of two materials
(4) The brittleness of raw materials Terfenol-D and PZT determines the poor toughness of the sample
[0004] In summary, there is no report on the 0-3 type and 2-2 type ternary composite magnetoelectric materials with organic polymers as binders. It is a new type of magnetoelectric material that can overcome the above problems. Four disadvantages, using a simple hot pressing process to obtain a magnetoelectric composite material with a good interface and stable performance

Method used

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  • Three-component compound magnetoelectric material using organic polymer as adhesive and its preparation method
  • Three-component compound magnetoelectric material using organic polymer as adhesive and its preparation method
  • Three-component compound magnetoelectric material using organic polymer as adhesive and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1 (type 0-3):

[0059] The ball-milled BT, Terfenol-D and PVDF powders are evenly mixed according to the volume percentage of 60%: 2%: 38%, and then the mixed powder is poured into the mold, and hot pressed at 180 ° C on the powder tablet press (the pressure is 8 MPa , the time is 25 minutes) forming, to obtain the required 0-3 type structural material, the process flow is as follows figure 1 As shown, its surface is polished, covered with silver electrodes, and then polarized in heated silicone oil with a polarization intensity of 3kv / mm. Its microstructure is as Figure 4 As shown, the magnetoelectric conversion coefficient is 1.0-2.2mv / cm Oe, and its change curve is shown in Figure 5.

Embodiment 2

[0060] Embodiment 2 (type 0-3):

[0061] The ball-milled PT, Terfenol-D and polyethylene (PE) powders are mixed evenly according to the volume percentage of 65%: 4%: 31%, and then the mixed powder is poured into the mold, and hot-pressed at 120°C on a powder tablet press (Pressure 10MPa, time is 30 minutes) molding, obtain required 0-3 structure material, technological process such as figure 1 As shown, its surface is polished, covered with silver electrodes, and then polarized in heated silicone oil with a polarization intensity of 3kv / mm. Its microstructure is as Image 6 As shown, the magnetoelectric conversion coefficient is 2 ~ 10mv / cm Oe, and its change curve is shown in Figure 7.

Embodiment 3

[0062] Embodiment 3 (type 0-3):

[0063] The ball-milled PZT, Terfenol-D and polyvinylidene fluoride (PVDF) powders are mixed evenly according to the volume percentage of 75%: 5%: 20%, and then the mixed powder is poured into a mold, and the powder is placed on a powder tablet machine at 200 ° C. Hot pressing (pressure 10MPa, time 30 minutes) molding to obtain the required 0-3 structure material, the process flow is as follows figure 1 As shown, its surface is polished, covered with silver electrodes, and then polarized in heated silicone oil with a polarization intensity of 3kv / mm. Its microstructure is as Figure 8 As shown, the magnetoelectric conversion coefficient is 6-15mv / cm Oe, and its change curve is shown in Figure 9.

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Abstract

The invention relates to the ternary compound magneto-electric material by use of the organic macromolecule as the agglomerant as well as its preparation method.With the organic macromolecule being as the agglomerant the piezoelectric ceramic(such as lead zirconate titanate etc.)and the magnetostriction material(such as terbium-dysprosium-iron alloy)are taken shape by hot pressing at low temperature.The magneto-electric compound material can be made by the method.Comparing the prior art,the invention possesses the advantages of simple process,good mechanical characters of the material and high magneto-electric transformation factor.The hotpressing technique provides the features of low pressing temperature(about 120-200 deg.C),easy to change the magneto-electric characters by changing the sequence for adding the constituent and the relative content.

Description

technical field [0001] The invention relates to a composite magnetoelectric material and a preparation method thereof, in particular to a preparation method of a ternary composite magnetoelectric material with an organic polymer as a binder. Background technique [0002] Magnetoelectric materials are in recent decades (1974 Van Run et al. reported BaTiO 3 -CoFe 2 o 4 The magnetoelectric conversion coefficient of this composite material is much larger than that of single-phase materials), a new type of multifunctional composite material developed, which is widely used in engineering technology. Since magnetoelectric materials not only have the properties of magnetic materials, but also have the properties of piezoelectric materials, and also have the unique properties of magnetoelectric materials, as a new type of material, magnetoelectric materials have the functions of three materials at the same time, and their applications are also It covers the fields of three materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H10N30/50H10N35/01
Inventor 南策文蔡宁刘莉翟俊宜
Owner TSINGHUA UNIV
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