A Piezoelectric Ceramic with High Voltage Resistance and High Stability

Abstract

The invention discloses high-voltage resistant high-stability piezoelectric ceramic, comprising the following raw materials in parts by weight: 100 parts of lead tetroxide, 14-17 parts of barium carbonate, 3.5-6.5 parts of strontium carbonate, 28-30 parts of zirconium dioxide, 15-17 parts of titanium dioxide, 9.6 parts of niobium pentoxide, 2.8 parts of nickel protoxide, 0.05-0.07 part of cerium oxide, 0.03-0.05 part of chromium sesquioxide, 0.04-0.06 part of silicon dioxide and 0.02-0.04 part of lithium carbonate. The piezoelectric ceramic is prepared through mixing, pre-sintering, crushing, baking, pulping, cast film forming, isostatic pressing, sintering, electric shock treatment and polarization. A micro unit cell of the piezoelectric ceramic is square unit cell, the included angle between crystal axes is 90 degrees, the unit cell structure is relatively stable, and the electric domain is changed little by high voltage and high temperature shock. A device manufactured by adopting the piezoelectric ceramic is low in performance drift and low in failure rate, the stability and consistency of products are improved, and large-scale application of piezoelectric high-power products is promoted.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, in particular to a piezoelectric ceramic with high voltage resistance and high stability. Background technique [0002] Piezoelectric ceramics is a new type of ceramic material with a development history of more than 100 years. In the middle of the last century, the invention of PZT piezoelectric ceramics promoted the rapid development of electronic technology, so that various electronic products appeared in front of us. Piezoelectric ceramics, as their internal precision components, can convert electrical energy into mechanical energy or The conversion of mechanical energy into electrical energy plays a key role in electronics. [0003] In the process of product development, due to the harsh application conditions of components, such as high working voltage, up to 220V; ultra-long working time, it is required to reach 3 years or more; the operating temperature is required to reac...

AI Technical Summary

Problems solved by technology

In order to obtain high piezoelectric performance, soft additives are generally used for doping modification, and the formula components are selected near the quasi-phase boundary (MPB). In the junction area, although the performance is active, the structural stability is poor. Under the action of external conditions, the phenomenon of "depolarization" is easily generated, which leads to the deterioration of the material performance, thus affecting the normal operation of the product.