摘要
采用等离子喷涂技术在不同喷涂距离下进行铁颗粒喷涂,使用扫描电子显微镜分析了经历不同喷涂距离后铁颗粒和涂层的形貌,利用氮氧分析仪测定了铁颗粒和涂层中的氧含量,分析了在喷涂过程中铁颗粒的氧化行为。结果表明:铁颗粒在飞行过程中存在扩散氧化和对流氧化两种氧化机制,对铁颗粒来说,当喷涂距离在50 mm内时以对流氧化为主,当喷涂距离超过50 mm后时将以扩散氧化为主;除飞行中的氧化外,在喷涂过程中还发生形成涂层后的氧化,铁颗粒在飞行过程中的氧化程度和形成涂层后的基本相当。
Using plasma spray technology iron particles were sprayed with different spray distances to prepare coatings. The surface and cross-setcion morphology of iron particles and coatings were investigated by scanning electron microscopy （SEM）. The oxygen contents of particles and coatings were determined by nitrogen-oxygen determinator. The results show that there were two oxidation mechanisms during in-flight oxidation. One was diffusion oxidation, and the other was convective oxidation The oxidation of iron particles was mainly convective as the spraying distance was less than 50 nm. After the distance was more than 50 nm, it would be mainly diffusion oxidation. The iron particles were oxidized after the coating formed. The oxidation degree of iron particles during flight was nearly the same as that of after coating formation.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第8期69-72,共4页
Materials For Mechanical Engineering
基金
北京市教委科技发展项目(KM200610005026
JP009012200803)
北京工业大学博士启动基金资助项目(52009999200701)
关键词
等离子喷涂
铁颗粒
氧化机理
plasma spray
iron particle
oxidation mechanism
