硅酸盐学报

用两步烧结法制备(K0.48–xNa0.52)(Nb0.93–xSb0.07)O3–xLiTaO3无铅压电陶瓷

作者：朱孔军王道利邵斌裘进浩季宏丽

分类号：TM282

出版年,卷(期):页码：2011,39(12):48-53

DOI：

摘要：

用传统固相法制备(K0.48–xNa0.52)(Nb0.93–xSb0.07)O3–xLiTaO3体系无铅压电陶瓷，X射线衍射物相分析结果表明：该体系陶瓷正交–四方转变的准同型相界位于0.035<x<0.04，在室温具有较高的压电性能。用传统烧结方法很难得到致密的压电陶瓷，用两步烧结工艺可以得到致密化且晶粒尺寸均一的陶瓷，因此重点研究采用两步烧结技术对x = 0.037 5的陶瓷进行烧结工艺的改进和优化，研究微观组织结构与陶瓷压电性能之间的关系。最佳两步烧结工艺为：θ1 = 1 120 ℃，t1 = 10 min，θ2 = 1 000 ℃，t2 = 5 h。制备陶瓷的电学性能如下：压电常数d33 = 261 pC/N，机械品质因数Qm = 29，相对介电常数εr = 1 659，平面机电耦合系数kp = 0.47。

Multi-component alkaline niobate (K0.48–xNa0.52)(Nb0.93–xSb0.07)O3–xLiTaO3 lead-free piezoelectric ceramics were successfully prepared by conventional solid-state method. Experimental results from X-ray diffraction patterns indicate that the existence of an orthorhombic-tetragonal morphotropic phase boundary at the composition of 0.035<x<0.04, exhibits a good piezoelectric coefficient at room temperature. However, it is not easily sintered by ordinary sintering technique. A two-step sintering process has been developed for preparing ceramics which can achieve densification without grain growth during the final sintering stage and results in a uniform grain size. So this work investigated the fabrication of lead-free ceramics with the optimal composition of x = 0.037 5 using two-step sintering method. The two-step sintering technique was optimized, and relationships between microstructure and piezoelectric properties were studied. Under the optimal sintering process: θ1 = 1 120 ℃, t1 = 10 min, θ2 = 1 000 ℃, t2 = 5 h, excellent properties of piezoelectric strain constant d33 = 261 pC/N, electromechanical quality factor Qm = 29, relative dielectric constant εr = 1 659, and electromechanical coupling coefficient kp = 0.47 were achieved.

基金项目：

国家自然科学基金(50872053，50830201)；教育部新世纪优秀人才支持计划(NCET-10-0070)；教育部长江学者创新团队(IRT0968)及江苏高校优势学科建设工程资助项目

作者简介：

朱孔军(1971—)，男，教授

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