颗粒表面改性法制备PTC粉体的研究  

Study on Preparation of PTC Powder by Particle-Surface Modifying Method

作　　者：薛军民[1] 李承恩[1] 赵梅瑜[1] 朱为民[1] 殷之文[1] 

机构地区：[1]中国科学院上海硅酸盐所

出　　处：《无机材料学报》1996年第2期232-236,共5页Journal of Inorganic Materials

摘　　要：本文介绍了一种通过液相颗粒表面改性技术添加二次掺杂物来制备ＰＴＣ粉体的新方法．即将烧结助熔剂Ａｌ２Ｏ３、ＳｉＯ２以及受主杂质ＭｎＯ采用溶液形式，包裹在ＢａＴｉＯ３基粉体颗粒表面进行改性，由此可以得到二次掺杂物Ａｌ２Ｏ３、ＳｉＯ２和ＭｎＯ分布均匀的ＰＴＣ粉体．用这种粉体制得的ＰＴＣ陶瓷，其晶粒均匀性以及电性能指标都优于传统固相法制得的ＰＴＣ陶瓷．A novel method of the uniform incorporation of sintering aids (Al2O3+SiO2) and acceptor additives (MnO) was developed for preparing PTC powder. The process involved dispersing the prefired powder of n-BaTO3 in aqueous solutions containing Al(NO3)3, (C2H5O)4Si and Mn(CH3COO)2, spray drying and calcining. The uniformity of grain and electric properties of the ceramics made from this PTC powder were better than that of from traditional PTC powder.

关 键 词：颗粒表面改性 粉体 化学均匀性 PTC陶瓷 制备 

分 类 号：TQ174.756[化学工程—陶瓷工业]