等离子喷涂过程中纳米粒子生长分析  

Growth analysis of nanoparticles during plasma spraying process

作　　者：王东生[1,2] 田宗军[2] 王泾文[1] 段宗银[1] 沈理达[2] 黄因慧[2] 

机构地区：[1]铜陵学院机械工程系,铜陵244000 [2]南京航空航天大学机电学院,南京210016

出　　处：《焊接学报》2011年第9期21-24,29,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(59975046;50305010);江苏省自然科学基金资助项目(BK2009375);安徽省高等学校省级自然科学研究项目(KJ2011B185);铜陵学院自然科学研究项目(2010tlxy20)

摘　　要：为了研究等离子喷涂过程中纳米粒子的生长情况,从而为喷涂工艺参数优化提供参考,在B rook晶粒生长经典理论基础上,计算了等离子喷涂纳米ZrO2-7%Y2O3粉末过程中纳米粒子尺寸变化,分析了不同温度历程及纳米粒子初始尺寸对其生长的影响.同时,对纳米团聚体粉末进行等离子喷涂试验.结果表明,纳米结构涂层是由一定比例完全熔化区和部分熔化区组成的特殊的两相结构,其中部分熔化区由经过一定长大但仍保持在纳米尺度的纳米粒子组成.试验结果较好的验证了计算结果,表明基于B rook理论的晶粒生长理论对了解纳米粒子在等离子喷涂过程中的生长有一定的理论指导意义.In order to optimize the processing parameters of nanostructured coating prepared by plasma spraying,the change of nanoparticle size during plasma spraying was investigated.Based on the Brook's classical theory about grain growth,a computational model for analyzing the nanoparticles growth of plasma-sprayed nanostructured agglomerated ZrO2-7%Y2O3 powders was established.The effects of the thermal circulation curve and nanoparticle diameter on grain growth were studied.Meanwhile,experiment of plasma spraying using nanostructured agglomerated powders was carried out.The results showed that the nanostructured coating had a bimodal microstructure,which was composed of both fully melted regions and partially melted regions.The partially melted regions were composed of slightly grown-up nanoparticles.The obtained experimental results showed a good agreement with the calculated results,which indicated that the nanoparticles growth theory based on the Brook's theory was correct and reliable.The theory provides theoretical basis for nanoparticles growth of plasma spraying.

关 键 词：等离子喷涂 纳米团聚体粉末 纳米粒子生长 

分 类 号：TG174.44[金属学及工艺—金属表面处理]