Si_3N_4粉体的分散及表面改性  

Dispersion and Surface-Modified of Si_3N_4 Powders

作　　者：陈桂才[1] 刘晓明[2] 范锦鹏[2] 

机构地区：[1]中国航天科技集团公司,北京100048 [2]航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京100076

出　　处：《宇航材料工艺》2013年第4期110-112,共3页Aerospace Materials & Technology

摘　　要：研究了以聚丙烯酸铵为分散剂的Si3N4悬浮体的分散特性,以及酸洗和热氧化两种表面改性方法对Si3N4悬浮体的分散性和流变特性的影响。结果表明:分散剂聚丙烯酸铵的最佳酸碱环境为pH=9,最佳使用含量为0.2wt%,酸洗可有效去除粉料中的金属杂质,使Si3N4粉体在悬浮体中粒径分布更集中且粒径主峰值向小粒径移动,同时可使悬浮体的黏度降低。热氧化处理可大幅度降低Si3N4悬浮体的黏度,提高其流变特性。The dispersion property of Si3 N4 was studied when ammonium polyacrylate was used as dispersant. And the influences of acid leaching and thermal oxidation on aqueous dispersibility were investigated. The results indicated that the best dispersing effect could be obtained when the ratio of ammonium polyacrylate was 0.2 wt% and pH = 9. Af- ter acid leaching, both the width and the value of particle diameter became smaller. The contamination of metal can be eliminated efficiently by acid leaching. After themal oxidation, the viscosity of Si3N4 suspension dropped significantly.

关 键 词：Si3N4粉体 分散性 流变特性 酸洗 热氧化 

分 类 号：TQ174.758[化学工程—陶瓷工业]