BNBST无铅压电陶瓷的制备工艺研究

设计了（Bi0.55Na0.5）1-X（BaaSrb）xTiO3（BNBST[100x-100a／100b]）无铅压电陶瓷新体系。该体系压电陶瓷具有工艺特性及压电响应好，压电常数高的特点，且有实际应用前景的新型压电陶瓷材料体系。采用传统的陶瓷工艺制备了（Bi0.55Na0.5）1-X（BaaSrb）xTiO3无铅压电陶瓷，研究了制备工艺参数对其物化结构性能的影响。生料的热重-差热（TGA-DTA）分析表明，粉料合成过程中，先是SrTiO3、BaTiO3的形成，然后是（Bi0．5Na0．5）Tio，的形成，同时三者形成固溶体；密度测试表明，陶瓷的体积密度随烧结温度的升高而增大，可较易获得理论密度94％的陶瓷；X-射线能谱分析（EDAX）研究表明，陶瓷的Bi、Na的挥发随着烧结温度的升高而加剧。研究结果表明，要制备性能优良的无铅压电陶瓷，需要精确控制制备工艺。

Study of the Preparation Technology of BNBST Lead-free Piezoelectric Ceramics

A new kind of lead-free piezoelectric ceramics, (Bi_(0.5)Na_(0.5))_(1-x)(Ba_aSr_b)_xTiO_3 (BNBST[100x-100a/100b]),was designed and synthesized, and the corresponding invention patent was applied in authors' group. The research results show that these ceramics can be synthesized through traditional technology, and possess very good piezoelectric properties. The (Bi_(0.5)Na_(0.5))_(1-x)(Ba_aSr_b)_xTiO_3 Lead-free Piezoelectric Ceramics was prepared by conventional oxide method. It was found that during the synthesis of the ceramics, the first step is the formation of SrTiO_3, then the formation of BaTiO_3, after wards the formation of (Bi_(0.5)Na_(0.5))TiO_3, and finally the formation of the solid solution. The ceramics are very easily sintered to a high density of 94% of the theoretical one without the atmosphere control during the sintering process. The EDAX analysis shows that there is the diffusion of the atoms of Bi and Na during the sintering process. The research results show that in order to get the lead free piezoelectric ceramics with better properties,the processing technology should be carefully controlled.