钛酸铋钠基陶瓷的烧结机制  

Sintering Mechanism of Na_(0.5)Bi_(0.5)TiO_3-based Ceramics

作　　者：姚永红[1,2] 王建武[1] 高峰[2] 田长生[2] 

机构地区：[1]陕西工业职业技术学院,陕西咸阳712000 [2]西北工业大学材料学院,陕西西安710072

出　　处：《材料科学与工程学报》2008年第6期896-899,共4页Journal of Materials Science and Engineering

基　　金：航空科学基金资助项目(03G53036)

摘　　要：应用晶粒生长动力学唯象理论研究籽晶模板对0.94Na0.5Bi0.5TiO3-0.06 BaTiO3无铅压电织构陶瓷烧结机制的影响规律,确定了晶粒生长动力学指数和激活能,探讨了籽晶含量对陶瓷晶粒生长的作用机理。实验结果表明:籽晶Bi2.5Na3.5Nb5O18含量小于或等于15wt%时,晶粒生长以界面反应和晶格扩散两种机制控制,籽晶含量大于或等于20wt%时,以界面反应机制为主;取向长条晶需要的激活能小而容易生长,且晶粒尺寸比等轴晶大。The sintering mechanism of 0. 94Na0.5 Bi0.8 TiO3-0.06BaTiO3 lead-free piezoelectric textured ceramics with the template was studied by the theory of phenomenological kinetic grain growth. The grain growth exponent and apparent activation energy were determined. The result shows that the grain growth mechanism is controlled by phase boundary reaction and grain lattice diffusion when the content of template Bi2.5Na3.5Nb5 O18 is at or smaller than 15wt%. At or more than 20wt%, the mechanism is controlled by gain boundary diffusion. In the ceramics, anisotropic grains need less apparent activation energy and the size is bigger than equiaxial grains.

关 键 词：无铅压电陶瓷 晶粒生长 激活能 

分 类 号：TM282[一般工业技术—材料科学与工程]