摘要
采用溶胶-凝胶法,结合粉末烧结工艺,分别制备了Mg掺杂钛酸铅粉体和块体材料,并讨论了凝胶工艺参数对PbTiO3干凝胶性能的不同影响因素,用TG-DTA、XRD、SEM等手段对干凝胶热分解、相组成和微观结构进行了分析.结果表明,干凝胶热分解分为干凝胶的吸附水和有机成分挥发、正丁基和醋酸根发生的氧化分解、晶相的转变3个阶段.最佳凝胶工艺参数为温度在60℃,而且pH值等于4.5,可以获得温度良好的溶胶和凝胶.XRD分析发现体系中含有PbTiO3、MgTi2O5两相;高温粉末烧结SEM微观组织表明,粒度尺寸约为1～2μm,同时晶粒的大小均匀,且几乎没有缺陷,说明了Mg掺杂超细PbTiO粉体陶瓷粉末具有良好的烧结致密化和收缩致密化特性.
PbTiO_3 powder and bulk material doped with Mg was prepared quickly by accelerated sol-gel and subsequently sintering process. Different processing parameters affecting the properties of gel were investigated and discussed. XRD, DTA-TGA and SEM were used to analyze the thermal decomposing, phase constitution and microstructure the doped PbTiO_3 xerogel. The results showed that the doped PbTiO_3 material contains two phases: PbTiO_3 and MgTi_2O_5 phases. The decomposing process include three parts: volatilization of water and organic composition, oxidation decomposing and transformation of crystal phases. The SEM analysis of the sintered product indicat that the grain dimension is about 1～2 um and distributed uniformity almost without any defects, which reveals that the PbTiO_3 doped Mg has a good sintering and densification characteristic.
出处
《哈尔滨理工大学学报》
CAS
2005年第2期129-132,共4页
Journal of Harbin University of Science and Technology
基金
国家自然科学基金资助项目(20171015)
