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A kind of ceramic-metal lead-free piezoelectric composite material with micron inner crystal structure and preparation method

A technology of piezoelectric composite materials and composite materials, which is applied in the field of ferroelectric composite materials and their preparation, can solve problems such as the inability to significantly improve the energy conversion coefficient of materials

Active Publication Date: 2022-06-17
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method cannot significantly improve the energy conversion coefficient of the material

Method used

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  • A kind of ceramic-metal lead-free piezoelectric composite material with micron inner crystal structure and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the chemical formula Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 / 0.5mol.%Ag Weighing Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 and Ag 2 O, and ball-milled in ethanol for 10 hours. After drying, the mixture was directly pressed and formed at 200 MPa, and then sintered at 1450 °C for 3 hours to obtain a composite material with a heating rate of 5 °C / min. It is worth pointing out that during the sintering process, when the temperature is 250–300 °C, the Ag 2 O is decomposed into Ag element and O 2 .

Embodiment 2

[0024] According to the chemical formula Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 / 1mol.%Ag Weighing Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 and Ag 2 O, others are the same as in Example 1.

Embodiment 3

[0026] According to the chemical formula Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 / 2mol.%Ag Weighing Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 and Ag 2 O, others are the same as in Example 1.

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Abstract

A ceramic-metal lead-free piezoelectric composite material with a micron inner crystal structure and a preparation method thereof belong to the technical field of piezoelectric composite materials. Micron-sized Ag metal particles are uniformly distributed in the BCTZ ceramic grains as the second phase to form a micron-sized intracrystalline structure. Due to the existence of this special microstructure, the simultaneous acquisition of high piezoelectric constant and low dielectric constant in piezoelectric materials has important prospects in the application field of piezoelectric energy harvesters.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric composite materials, and in particular relates to a ferroelectric composite material with high-voltage electric constant and low dielectric constant which can be applied to energy collection devices and a preparation method thereof. Background technique [0002] Under the background of the energy crisis, how to collect and convert the waste energy in the environment into reusable electric energy has attracted the attention of governments, academia and even the general public. Among them, energy harvesting devices based on the piezoelectric effect can convert mechanical energy generated in the environment into electrical energy, and have the characteristics of high energy conversion efficiency, high output voltage, immunity to electromagnetic interference, and easy miniaturization, so they have broad application prospects. However, currently reported energy harvesting devices have low power d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/468C04B35/622B22F9/30B22F1/054H10N30/853
CPCC04B35/468C04B35/622B22F9/30C04B2235/3208C04B2235/3244C04B2235/6562C04B2235/6567B22F1/054
Inventor 郑木鹏晏晓东侯育冬朱满康
Owner BEIJING UNIV OF TECH
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