Preparation method of multilayer piezoelectric ceramic used in high-temperature environment of 482 DEG C

Abstract

The invention discloses a preparation method of a multilayer piezoelectric ceramic used in a 482 DEG C high-temperature environment. The preparation method mainly comprises the following steps: uniformly stirring high-temperature ceramic powder, a solvent, a dispersing agent, a binder and a thickening agent by using a stirrer to prepare tape casting slurry; forming a film with a certain thickness through a casting machine, printing an inner electrode, and printing an outer electrode after isostatic pressing lamination; and discharging glue at a low heating rate and sintering the ceramic at a low temperature. The piezoelectric property tends to be stable through ceramic polarization and high-temperature aging. The multilayer piezoelectric ceramic prepared by the preparation method of the multilayer piezoelectric ceramic used in the high-temperature environment of 482 DEG C can meet the use requirements of the high-temperature environment, is good in piezoelectric property, can be completely used in the high-temperature environment of 482 DEG C, and is stable in piezoelectric property after long-time heat preservation at the high temperature of 482 DEG C; and the performance is stable after aging at a high temperature of 550 DEG C, and the use requirement in a high-temperature environment is met.

Description

technical field [0001] The invention relates to the technical field of lead-free piezoelectric ceramics, in particular to a method for preparing multilayer piezoelectric ceramics used in a high-temperature environment of 482°C. Background technique [0002] In recent years, with the further expansion of the application range of piezoelectric materials, new challenges have been posed to the service performance of piezoelectric ceramics in some extreme high-temperature environments. For example, in the field of aerospace, high-temperature piezoelectric acceleration sensors play an important role. In July 2006, the United States successfully launched the space shuttle "Discovery 3". Only one wing part was installed with 66 piezoelectric acceleration sensors with excellent temperature response to closely monitor the working status of the spacecraft's wings. The core component of the high-temperature piezoelectric acceleration sensor is piezoelectric ceramics, which need not dep...

AI Technical Summary

Problems solved by technology

The piezoelectric ceramics currently on the market are mainly PZT piezoelectric ceramics. Although PZT piezoelectric ceramics have the advantages of high piezoelectric coefficient, stable performance, and high mechanical strength, their Curie temperature T C About 360°C, safe use temperature is difficult to meet the needs of high temperature environment

[0003] Bi layered piezoelectric ceramics is one of the most studied high-temperature piezoelectric ceramic systems. C It is about 780°C, but the low piezoelectric constant limits its application. Researchers have improved its piezoelectric performance by adjusting the composition and optimizing the preparation process, but the piezoelectric performance is still around 30pC / N, and it is likely to have more big breakthrough

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