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Nickel/piezoelectric ceramic laminar composite material with magnetoelectric effect and preparation process thereof

A technology of layered composite materials, magnetoelectric composite materials, applied in material selection for piezoelectric devices or electrostrictive devices, manufacture/assembly of magnetostrictive devices, manufacture/assembly of piezoelectric/electrostrictive devices and other directions, it can solve the problems of high material price, complex preparation process, small resistivity, etc., and achieve the effect of low price and simple preparation process

Inactive Publication Date: 2006-04-05
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of material has high resistivity and is suitable for high-frequency environments, it has the following disadvantages: (1) The preparation process of the material is complicated, and the magnetic and electrical properties are difficult to further improve; (2) The material is very brittle and has poor processability; (3) The surface of the material needs to be coated with electrodes
Although this type of material has the highest magnetoelectric voltage coefficient, it has the following disadvantages: (1) The material has high brittleness and poor processability
(2) The preparation and processing of terbium-dysprosium-iron alloy is difficult, the material price is high and it is difficult to obtain small-sized terbium-dysprosium-iron alloy flakes
(3) The magnetostrictive effect of terbium-dysprosium-iron alloy requires a large driving magnetic field. Therefore, a bias magnetic field needs to be applied in the design of components, which is not conducive to the miniaturization of devices
(4) The resistivity of terbium-dysprosium-iron alloy is small, and the increase of thickness will increase the eddy current loss
Nan Cewen etc. (Chinese Invention Patent CN 1395325A) adopt the low-temperature hot-pressing process with organic polymer as binder, and Xiong Chuanxi etc. (Chinese Invention Patent CN 1392194A) adopt organic polymer as binder particle compression, Terbium-dysprosium-iron alloy / organic binder / piezoelectric ceramic ternary layered composite material was prepared by suspension coating process, which can reduce the thickness of terbium-dysprosium-iron layer, but the magnetoelectric properties are greatly reduced due to the dilution of organic binder , and the surface of the material needs to be coated with electrodes

Method used

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  • Nickel/piezoelectric ceramic laminar composite material with magnetoelectric effect and preparation process thereof
  • Nickel/piezoelectric ceramic laminar composite material with magnetoelectric effect and preparation process thereof
  • Nickel/piezoelectric ceramic laminar composite material with magnetoelectric effect and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepared by the following method figure 1 (a) The composite sample of the double-layer nickel / piezoelectric ceramic layer structure shown:

[0020] Step 1: A piezoelectric ceramic sheet 1 with a length of 30 mm, a width of 10 mm, and a thickness of 0.2 mm is plated with gold or silver electrodes on the upper and lower sides, and polarized along the thickness direction.

[0021] Step 2: A nickel sheet 2 with a length of 30 mm, a width of 10 mm, and a thickness of 0.1 mm was bonded to the piezoelectric ceramic sheet with a silver powder epoxy adhesive, and cured at room temperature to obtain a composite material sample with a double-layer structure.

[0022] The experimental test curve of the magnetoelectric voltage coefficient dE / dH of the prepared composite material sample as a function of frequency is as follows figure 2 . The composite material reaches the maximum magnetoelectric voltage coefficient of 4.8V / A at the resonance frequency, and the magnetoelectric volt...

Embodiment 2

[0024] Prepared as follows figure 1 (b) The three-layer structure nickel / piezoelectric ceramic layered composite material sample:

[0025] Step 1: A piezoelectric ceramic sheet 1 with a length of 30 mm, a width of 10 mm, and a thickness of 0.2 mm is plated with gold or silver electrodes on the upper and lower sides, and polarized along the thickness direction.

[0026] Step 2: Use silver epoxy adhesive to bond two nickel sheets 2 with a length of 30 mm, a width of 10 mm, and a thickness of 0.1 mm to both sides of the piezoelectric ceramic sheet, and cure at room temperature to obtain a composite material with a three-layer structure sample.

[0027] The experimental test curve of the magnetoelectric voltage coefficient dE / dH of the prepared composite material sample as a function of frequency is as follows image 3 shown. In the experimental test range, the magnetoelectric voltage coefficient of the three-layer structure composite material at the non-resonant frequency is 0.8...

Embodiment 3、4、5、6、7、8、9、10

[0029] Using the same bonding process as in Example 1 and Example 2, Ni sheets and piezoelectric ceramic sheets of different thicknesses are bonded together, then the magnetoelectric voltage coefficient of the layered composite material increases with the Ni sheet and piezoelectric ceramic sheet. The layer thickness ratio and lamination structure change, and the experimental results are shown in Table 1. The magnetoelectric voltage coefficient increases with the increase of Ni to piezoelectric ceramic layer thickness ratio. It should be noted that the resonant frequency of the three-layer board is very high. Due to the limitation of the test conditions, the experiment cannot measure the magnetoelectric voltage coefficient at the resonant frequency.

[0030]

[0031] 8

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Abstract

The invention relates to a nickel / piezoelectric ceramic layered composite material with magneto-electric effect and its relative preparing method. Wherein, said composite material is compounded by the nickel plate and piezoelectric ceramic plates by the method of adhering while the thickness rate between nickel layer and piezoelectric ceramic layer is 0.1-5. The preparing method comprises that plating gold or silver electrode on the upper and lower surfaces of piezoelectric ceramic plate whose thickness is 0.2-1mm and the electrode will be polarized along the direction of thickness of piezoelectric ceramic plate; utilizing the organic conductive binder to bind the nickel plate and the piezoelectric ceramic plate whose thickness ranges from 0.1-1 mm to be solidified in room temperature to attain said composite material. The inventive composite material, compared to present electromagnetic material, has high electromagnetic performance, simple preparing process, lower cost, stable property and higher designable ability, which can change the electromagnetic property of material via changing the size and the layer pattern of composite structure.

Description

technical field [0001] The invention relates to a composite material with magnetoelectric coupling effect and a preparation method thereof, in particular to a layered composite material composed of nickel and piezoelectric ceramics and a preparation method thereof. Background technique [0002] Magnetoelectric materials have the function of converting magnetic energy into electrical energy, that is, they generate dielectric polarization under the action of an external magnetic field or generate magnetization under the action of an external electric field. The preparation of magnetoelectric materials into magnetoelectric functional devices can be used in magnetic and electric field sensing, magnetoelectric information storage, current detection, microwave leakage detection and other technical fields. It has small size, high conversion efficiency of magnetic energy and electrical energy, easy integration, and easy Therefore, the development of magnetoelectric materials and dev...

Claims

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Application Information

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IPC IPC(8): H01L41/18H01L41/083H01L41/22H01L41/39H01L41/47
Inventor 万红吴学中徐超谢力强
Owner NAT UNIV OF DEFENSE TECH
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