A preparation method for multilayer piezoelectric ceramics used in a high temperature environment of 482°C

Abstract

The invention discloses a method for preparing multilayer piezoelectric ceramics used in a high-temperature environment of 482°C, which mainly includes the following steps: stirring high-temperature ceramic powder, solvent, dispersant, binder and thickener with a stirrer Uniform preparation of casting slurry; forming a film of a certain thickness through a casting machine and printing the inner electrode, and printing the outer electrode after isostatic lamination; debinding at a low heating rate and sintering ceramics at low temperature; ceramic polarization and high temperature Aging stabilizes the piezoelectric properties. The multilayer piezoelectric ceramics prepared by the method for preparing multilayer piezoelectric ceramics used in a high-temperature environment of 482°C according to the present invention can meet the use requirements of a high-temperature environment, and have good piezoelectric performance, and can be completely used in a high-temperature environment of 482°C , The piezoelectric performance is stable after a long time of heat preservation at a high temperature of 482 ° C; the performance is stable after aging at a high temperature of 550 ° C, meeting the requirements of high temperature environments.

Description

A kind of preparation method of multilayer piezoelectric ceramics used in 482 ℃ high temperature environment technical field The present invention relates to the technical field of lead-free piezoelectric ceramics, in particular to a kind of multi-layer used in 482 ℃ high temperature environment Method for preparing piezoelectric ceramics. Background technique [0002] In recent years, with the further expansion of the application range of piezoelectric materials, in some extreme high temperature environments, the The service performance of porcelain presents new challenges. For example, in the aerospace field, high temperature piezoelectric accelerometers play an important role to function. In July 2006, the United States successfully launched the space shuttle "Discoverer 3", only one wing part was installed with 66 Piezoelectric accelerometers with excellent temperature response are used to closely monitor the working conditions of spacecraft wings. high temperat...

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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