摘要
以TiO2和BaCO2，SrCO3粉体为原料，采用凝胶固相反应法合成了亚微米级Ba—Sr0.4TiO3陶瓷粉体。对凝胶固相反应过程进行了DSC热分析，并观察和测定了合成粉体的微观形貌、相结构和粒度分布。结果表明：Ba0.6Sr0.4TiO3粉体合成温度对应于857℃，在900～1000℃温度范围煅烧均可获得颗粒尺寸约0．5μm、粒径分布均匀的Ba0.6Sr0.6TiO3粉体。试验结果表明，凝胶固相合成Ba0.6Sr0.4TiO3的粉体粒径取决于原料粉体尺寸，经高温煅烧后因各组元元素的互扩散导致粉体粒径有所长大，要获得更细的合成粉体应采用更细的粉体原料。
Sub-micro Ba0.6Sr0.4 TiO3 ceramic powders were prepared by the gel-solid reaction method using TiO2, BaCO3 and SrCO3 powders as raw materials. DSC thermodynamics was used to analyze the heat flow and accurate temperature of each reaction during the preparation process. Microstructure, phase structure and granularity of the powders were investigated. The results show that reaction temperature of Ba0. 6Sr0.4TiO3 ceramic powders was about 857℃ Uniformly dispersed Ba0.6Sr0.4TiO3 powders of 0.5μm diameter can be prepared under the temperature range of 900℃ -1000℃. The particle size of the synthesized powders is determined by the particle size of the raw materials. The particle size increases during the heat treatment because of the composition diffusion. Therefore, small size particles of the raw materials should be chosen to prepare for the synthesized powders of small size.
出处
《真空电子技术》
2009年第4期54-58,共5页
Vacuum Electronics
