多功能微弧等离子喷涂技术

Multi-function micro-plasma spraying technology

关键词:  多功能  微弧等离子喷涂  纳米结构涂层

Key words:  multi-function  micro-plasma spraying  nanostructured coating

摘要:

根据空气动力学和等离子喷涂理论,按照"一专多能"的设计指导思想,采用IGBT逆变技术、微电脑控制技术、软开关变换技术、拉瓦尔喷嘴和中心轴向送粉等,设计了多功能微弧等离子喷涂系统,且具有体积小、重量轻、抗干扰强、控制精确、喷涂粒子速度高、粉末沉积效率高等特点,可制备各种金属合金、金属陶瓷以及氧化物涂层。通过试验测定,多功能微弧等离子喷涂制备的纳米结构Al₂O₃+13%TiO₂涂层的结合强度、显微硬度等性能优于9M等离子喷涂制备的纳米结构的Al₂O₃+13%TiO₂涂层,这表明通过改进电源设计、喷枪结构设计、送粉方式等,低功率多功能微弧等离子喷涂能够与大功率等离子叶涂性能相当甚至更优异性能的涂层。

Abstract:

According to aerodynamics,plasma spray theory and the idea of "expert in one thing and good at many",multi-functional microplasma spraying systems were developed.The IGBT inversion technology,micro-computer control engineering,soft switch technology,Laval nozzle structure and center axial powder feed were adopted in the designs of micro-plasma spraying systems,which made it possess the characteristics of small volume,light weight,strong anti-jamming,accurate control,high velocity of spray particles,high deposit efficiency of powder and high reliability etc.The system can produce different kinds of high quality coatings.The experimental results show that the bonding strength and microhardness of nano-structured Al₂O₃+13%TiO₂ coatings produced by multi-functional micro-plasma spraying are better than those of the same coatings produced by 9M plasma spraying.As the result,the coatings whose properties are equavitent of those of the coatings produced by conventional plasma spraying can also be deposited by multi-functional micro-plasma spraying with lower power by means of improving power design,spray gun structure and powder feed method.