水基SiC料浆的分散稳定机制及喷雾造粒  

DISPERSIBILITY MECHANISM AND SPRAY DRYING OF SiC AQUEOUS SLURRY

作　　者：郭兴忠[1] 杨辉[1] 朱潇怡[1] 李海淼[1] 马奇[1] 高黎华[2] 傅培鑫[2] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027 [2]浙江东新密封有限公司,浙江乐清325604

出　　处：《硅酸盐学报》2008年第5期642-647,共6页Journal of The Chinese Ceramic Society

基　　金：浙江省重大科技(2006C11184)资助项目

摘　　要：以去离子水为液体介质,引入有机添加剂,配制水基SiC悬浮料浆,研究了水基料浆的分散稳定机制及其喷雾造粒行为,分析了有机添加剂和固相含量对料浆流变性能、造粒粉粒径分布及成型性能的影响机制。结果表明:当料浆pH≥10时,水基碳化硅料浆的分散性和稳定性较好,料浆具有剪切稀化的非Newton体特性;当加入0.2%(质量分数,下同)四甲基氢氧化铵、2.0%聚乙烯醇和1.0%聚乙二醇时,料浆黏度较小;固相含量为50%水基料浆喷雾造粒后,造粒粉的流动性、填充性能及成型性能明显提高,但球状造粒粉需要在一定成型压力下才能完全破碎。SiC suspended slurry was prepared with organic additives and with deionized water as liquid media.The dispersibility mechanism and spray drying behavior of aqueous slurry were studied.The effects of the organic additives and solid content on the rheological behavior of slurry and the particle size distribution and molding properties of granulated powder pellets were also dis-cussed.The results show that the aqueous SiC slurry has well dispersed behavior and is stable at pH≥10.The slurry exhibited non-Newton...

关 键 词：碳化硅 料浆 分散 喷雾干燥 

分 类 号：TQ174.6[化学工程—陶瓷工业]