A kind of anisotropic piezoelectric ceramic material and preparation method thereof

Abstract

The invention provides an anisotropic piezoelectric material and a preparing method thereof. The composition chemical formula is as follows: [(1-x) (0.7PbZrO3 - 0.3K0.5Bi0.5TiO3) - xPbTiO3] + yPbZnNb2O5, x = 0.25 - 0.30, y = 0.01 - 0.20. The preparing method comprises the following preparing steps: mixing materials by a mass molar in the formula, ball-grinding by a wet method, briquetting after drying and synthesizing; synthesizing blocks after coarse grinding, carrying out secondary wet ball grinding, and pelletizing polyvinyl alcohol after drying; feeding degummed biscuits in an aluminum oxide crucible and sintering into ceramic; carrying out electrode oil bath polarization on the ceramic to obtain the anisotropic piezoelectric material. The material has high anisotropism, the piezoelectric strain coefficient in the polarization direction is larger than the piezoelectric coefficient in the non-polar direction, and the isostatic pressing piezoelectric sensitivity is as high as 40*10<-3> V.m / N and much higher than that of a lead zirconate titanate piezoelectric material. The material ingredients are reasonable and are easy to sinter and polarize, and the material is particularly suitable for manufacturing high-sensitivity and high-resolution hydrophones.

Description

technical field [0001] The invention relates to an anisotropic piezoelectric material and a preparation method thereof, more precisely, to a piezoelectric material for making high-sensitivity and high-resolution hydrophones and a preparation method thereof, belonging to the field of sensors. Background technique [0002] Materials science is the technical basis of underwater acoustic transducers and various acoustic functional devices. With the continuous discovery and utilization of new high-performance active or passive acoustic materials and new mechanisms, the development of underwater acoustic transducers and acoustic functional devices has been greatly promoted, and the replacement of these devices has been accelerated, and new replacements have emerged. Energy devices and functional devices. In recent years, with the development of stealth technology, the identification of underwater targets has become more and more difficult, and the development of high-sensitivity ...

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Problems solved by technology

However, the firing of lead titanate materials is extremely difficult, and the high polarization electric field process (applied electric field strength is usually greater than 5000V / mm) also brings stringent requirements, which greatly reduces the success rate of polarization.

In addition lead metaniobate PbNb 2 o 5 Piezoelectric materials also have good anisotropy, and the isostatic piezoelectric constant g h up to 33.5×10 -3 V·m / N, but the production of lead metaniobate materials is particularly difficult, and the requirements for firing and polarization processes are very strict. At present, there are very few manufacturers that can provide large-scale lead metaniobate materials, and the price is naturally low. Cheap

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