High performance leadless piezoelectric ceramics and preparation technology

A lead-free piezoelectric, high-performance technology, applied in the field of piezoelectric ceramics, can solve problems such as lead toxicity and side effects, and achieve high-performance stability, high-voltage electrical performance, and high-dielectric effects.

Inactive Publication Date: 2014-03-05
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lead has toxic and side effects on the human body and the environment, so many developed countries have banned the production of lead-containing electronic products

Method used

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  • High performance leadless piezoelectric ceramics and preparation technology
  • High performance leadless piezoelectric ceramics and preparation technology
  • High performance leadless piezoelectric ceramics and preparation technology

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Embodiment Construction

[0028] The present invention is described in detail below in conjunction with accompanying drawing,

[0029] The present invention is a high-performance lead-free piezoelectric ceramic, barium titanate (0.89BaTiO) doped with barium stannate 3 -0.11BaSnO 3 ), and its raw material components are stoichiometrically:

[0030] Titanium dioxide: barium carbonate: tin dioxide=0.89:1:0.11

[0031] A preparation process of high-performance lead-free piezoelectric ceramics, comprising the following steps:

[0032] (1) Ingredients

[0033] The raw materials titanium dioxide, barium carbonate and tin dioxide are mixed according to the stoichiometric ratio (molar ratio) of 0.89:1:0.11;

[0034] (2) Ball milling

[0035] Put the raw materials weighed in step (1) into a ball milling tank. The ball milling medium is distilled water and zirconia balls. The mass ratio of raw materials, distilled water, and zirconia balls is 1:2:2. Ball mill for 4 hours, and then ball mill The mixture is p...

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Abstract

The invention relates to high performance leadless piezoelectric ceramics and its preparation technology, the preparation technology comprises the following steps: burdening titanium dioxide, barium carbonate and stannic oxide according to stoichiometric ratio of 0.89: 1: 0.11, ball milling, pre-burning, performing secondary ball milling, granulation granulating and molding, covering by a crucible finally, putting in a sintering furnace, heating to the temperature of 500 DEG C by a speed of 2 DEG C/min, insulating for 2 hours and dumping, then heating to the temperature of 1400 DEG C at the speed of 4 DEG C/min and insulating for 4 hours, and then cooling in furnace to the room temperature to obtain the required leadless piezoelectric ceramics. The leadless piezoceramic material has high dielectric and piezoelectric performance at quasi four-phase point, the relative dielectric constant of the material can reach 75000 which is 6-7 times of the dielectric constant of pure barium titanate at the Curie temperature, the piezoelectric coefficient d33 can reach 697pC/N which is 5 times of the room temperature piezoelectric coefficient of the pure barium titanate, and the data can be the highest data in that of the leadless piezoceramic material.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, in particular to a high-performance lead-free piezoelectric ceramic and a preparation process thereof. Background technique [0002] Piezoelectric materials and piezoelectric properties were discovered by the Curie brothers in 1880. Piezoelectricity means that a material will form an accumulated charge on the surface under an external force field to form an electric field, or the material will deform when an external electric field is applied. As a bridge between mechanical energy and electrical energy, piezoelectric materials are widely used in detectors, transducers and actuators, such as inkjet printers and mobile phone microphones used in daily life, and probes for atomic force microscopes in high-end research Console and ultrasonic detection technology. More recently, piezoelectric materials have been used for energy harvesting and storage. [0003] The most widely used piez...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 姚永刚杨耀东任晓兵
Owner XI AN JIAOTONG UNIV
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