摘要
采用溶胶-凝胶法及超临界干燥技术按多层陶瓷电容器磁粉添加剂配方比例制备Bi、Sr、Ce、Mn和Si的化合物纳米复合粉。以DTA、SEM、XRD等检测方法对纳米复合粉的表面形貌、粒度、晶相组成等进行表征。研究结果表明：温度为50℃,pH值为-0.25,H2O/TEOS=9/1（V/V）,并加入占TEOS体积5%的硅烷偶联剂KH570,可以制备得到复合物体系的稳定凝胶。以无水乙醇为超临界萃取剂,进行超临界干燥,煅烧温度约高于700℃,得到分散性较好的纳米复合粉体,粉体一次颗粒径约为40-60nm,粉体形貌近似球型。复合粉的主要晶相为Bi2SiO5、CeO2和Sr2Mn2O5。
Nanometer composite powder used for multilayer ceramic capacitor was prepared by the sol-gel method and supercritical desiccation technique. The micro-morphology, granularity and crystalline structure of powder were characterized by DTA, SEM and XRD. The results show that： The steady gel was prepared in 50℃, pH value of -0.25, H2O/TEOS=9/1（V/V） and KH570/TEOS=5%（V/V）. Supercritical desiccation was carried through using ethanol as extraction agent. To decompose nitrate completely,calcining temperature was more than 700 ℃. The optimal nanometer powder was obtained, in which the main component were Bi2SiO5, Bi10Sr11, CeO2 and Sr2Mn2O5, and the dispersion property was good. The particle size was about 40～60nm.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2008年第2期428-432,共5页
Bulletin of the Chinese Ceramic Society
关键词
多层陶瓷电容器
纳米复合粉
表面改性
超临界干燥
multilayer ceramic capacitor
nanometer composite powder
surface modification
supercritical desiccation
