摘要
以天然红柱石为原料,采用高温煅烧使其发生莫来石化转变,然后经喷雾造粒、热处理,得到热喷涂用球形莫来石/SiO2复合粉末。采用大气等离子喷涂工艺在1Cr18Ni9Ti不锈钢上喷涂莫来石/SiO2粉末制得涂层,对涂层的微观组织、硬度和相成分进行了分析。研究结果表明:天然红柱石粉末莫来石化后,其相组成主要为莫来石和游离态SiO2;喷雾造粒粉末在1 000℃热处理后,松装密度得到改善;涂层具有良好的微观形貌,表面显微硬度较高,主要由莫来石、石英和非晶玻璃相构成。
Natural andalusite powders as raw material were heated at high temperature in air allowing mullitization.The resultant mullitized powder was spray-dried and heat treated to attain spherical mullite/SiO2 composite powder.The mullite/SiO2 composite powder was then plasma sprayed onto stainless steel（1Cr18Ni9Ti） to form coatings.The microstructural,microhardness and phase structure of as-sprayed mullite coatings were analysed.Results show that the mullitized andalusite powder consists of mullite and a small amount of free SiO2.The apparent density of spray-dried powders is improved after thermal treatment at 1 000 ℃.The as-sprayed coating has fine microstructure and higher microhardness.The phase component of as-sprayed coating consistes of crystalline mullite,quartz and amorphous glass phase.
出处
《表面技术》
CAS
CSCD
北大核心
2010年第5期1-3,76,共4页
Surface 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)
