Solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and preparation method thereof

一种固溶改性钛酸铋钠系无铅压电陶瓷及其制备方法

Abstract

本发明提供一种固溶改性钛酸铋钠系无铅压电陶瓷及其制备方法,以化学组成通式(1-x)(0.74Na0.5Bi0.5TiO3-0.26SrTiO3)-xBa(Zr0.05Ti0.95)O3或(1-y)(0.9Na0.5Bi0.5TiO3-0.1CaTiO3)-yBa(Zr0.05Ti0.95)O3表示,其中0.04≤x≤0.1,0.04≤y≤0.1,本发明在准同型相界的0.74Na0.5Bi0.5TiO3-0.26SrTiO3、0.9Na0.5Bi0.5TiO3-0.1CaTiO3体系中固溶Ba(Zr0.05Ti0.95)O3,通过两步成型法与自承重加压烧结工艺获得高致密度微晶结构陶瓷,晶粒尺寸分布均匀,利用准同型相界组成特征与固溶改性方法优化材料的压电性能,压电常数d33可以达到110~138PC/N,材料的机电耦合系数也明显提高,材料制备工艺简单、稳定,是制造用于气体传感器及工业无损探伤等领域的小功率超声器和换能器的优选材料。
The invention provides solid solution-modified sodium bismuth titanate leadless piezoelectric ceramics and a preparation method thereof. The piezoelectric ceramics are represented by chemical composition general formula of (1-x)(0.74Na0.5Bi0.5TiO3-0.26SrTiO3)-xBa(Zr0.05Ti0.95)O3 or (1-y)(0.9Na0.5Bi0.5TiO3-0.1CaTiO3)-yBa(Zr0.05Ti0.95)O3, wherein 0.04<=x<=0.1 and 0.04<=y<=0.1. Solid solution of Ba(Zr0.05Ti0.95)O3 is realized at the morphotropic phase boundary of a 0.74Na0.5Bi0.5TiO3-0.26SrTiO3 and 0.9Na0.5Bi0.5TiO3-0.1CaTiO3 system, and high-density microcrystalline structure ceramics with uniform crystal grain size distribution are obtained by a two-step forming method and a self-bearing pressure sintering process. The piezoelectric property of the material is optimized by the morphotropic phase boundary composition characteristics and the solid solution modification method, and the piezoelectric constant d33 reaches 110-138 PC/N; the electromechanical coupling coefficient of the material is also increased obviously; the preparation process of the material is simple and stable, and the material is an optimal material for manufacturing low-power ultrasonic devices and energy transducers used in fields of gas sensors, industrial nondestructive test, and the like.

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Cited By (1)

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