A Piezoelectric Acceleration Sensor Made Using Nano Barium Titanate Ceramics

Abstract

The invention discloses a piezoelectric acceleration sensor prepared from nanometer barium titanate ceramic. The piezoelectric acceleration sensor comprises a shell, a preloaded spring accommodated in the shell, a mass block, a piezoelectric element prepared from the nanometer barium titanate ceramic, a bolt and a pedestal, wherein electrodes are formed on the upper and lower surfaces of the piezoelectric element prepared from the nanometer barium titanate ceramic, and acceleration is detected by detecting voltage or current generated when the piezoelectric element is stressed, wherein the nanometer barium titanate ceramic is endowed with higher density and lower leakage current by a unique stepped annealing procedure.

Description

technical field [0001] The invention relates to a piezoelectric acceleration sensor prepared by using nano-barium titanate ceramics, wherein the nano-barium titanate ceramics has high dielectric constant, high density and low current loss, and is passed through specific annealing steps and high-pressure sintering steps High density and high density nano barium titanate ceramics are obtained. Thus, the piezoelectric acceleration sensor thus prepared has extremely high sensitivity. Background technique [0002] Ceramics is the earliest material manufactured by human beings using the raw materials provided by nature, and has a long history. Since the middle of this century, due to the development of ceramic technology, some ceramics with excellent performance have appeared one after another. Functional ceramics refer to ceramic materials that have special mechanical, electrical, and thermal properties and can be coupled to each other in terms of mechanics, electricity, sound,...

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Problems solved by technology

Therefore, it is difficult to maintain the characteristics of nanomaterials with conventional sintering processes

There are many existing high-pressure sintering methods, for example, by sintering the pellets prepared by nano-ceramics under tens of thousands of atmospheric pressures. Although compared with conventional methods, high-pressure sintering methods have many advantages, but at 6GPa (about 60,000 Atmospheric pressure) under high pressure, a sealing edge is formed around the pyrophyllite, and the sample is almost in a vacuum atmosphere. When nano barium titanate ceramics are sintered in vacuum, inert atmosphere or reducing atmosphere, oxygen vacancies will be generated, and the existence of oxygen vacancies will not only Affect the compactness of nano barium titanate ceramics, and also affect its ferroelectric properties

Barium titanate ceramics is a well-known piezoelectric material in the art, but when it enters the nanometer scale, the leakage current of barium titanate increases sharply, and the dielectric constant decreases significantly. Therefore, the existing nano barium titanate ceramics are prepared The sensitivity of the piezoelectric acceleration sensor is relatively poor. The purpose of the present invention is to prepare nano-barium titanate ceramics through a special process, thereby improving the sensitivity of the piezoelectric acceleration sensor

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