天然红柱石莫来石化后热喷涂粉末的制备  

Preparation of thermal spray powders using mullitized natural andalusite

作　　者：安宇龙[1,2] 陈建敏[1] 刘光[1,2] 周惠娣[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000 [2]中国科学院北京研究生院,北京100049

出　　处：《材料科学与工艺》2011年第4期107-111,共5页Materials Science and Technology

基　　金：国家自然科学基金委创新研究群体科学基金资助项目(50421502);国家重点基础研究发展计划资助项目(2007CB607601)

摘　　要：为获得莫来石热喷涂粉末,采用天然红柱石粉末作为原料,在1480℃保温4 h完成一次莫来石化后,加入适量Al2O3再次在1480℃保温4 h进行二次莫来石化反应,利用喷雾干燥工艺制备莫来石粉末,分析了红柱石粉末和莫来石化粉末的成分及相组成,测试了粉末粒度分布,表征了粉末的形貌.结果表明:天然矿物红柱石粉末一次莫来石化后,粉末主要由莫来石和质量分数约20%的SiO2组成;经过二次莫来石化反应后,粉末成分为莫来石和微量的Al2O3;二次莫来石化的粉末经喷雾干燥、热处理后,粉末的流动性和松装密度得以改善;热处理后粉末粒度呈典型的正态分布,且粒径尺寸适合大气等离子喷涂.To obtain mullite thermal spray powders,natural andalusite powders were annealed at 1480℃in air for 4 h to promote their mullitization,then,after adding an appropriate amount Al 2 O3 powders,the secondary mullitization was carried out.The mullitized powders were prepared by spray-dried process.The component and phase structure of the powders before and after mullitzation were analyzed,the size distribution of the powders was tested,and the morphology of spray-dried powders was investigated.The results showed that the primary mullitized andalusite powders contained mullite and about 20wt%SiO2.After the secondary mullitization,the powders were constituted of mullite and a limited amount of Al 2 O3.The fluidity and apparent density of spray-dried powders were improved by heat-treatment,and its typical size distribution was suitable for air plasma spray.

关 键 词：红柱石 莫来石化 莫来石 喷雾干燥 

分 类 号：TG174.442[金属学及工艺—金属表面处理]