摘要
等离子喷枪的电弧伏安特性和热效率等电热特性是影响等离子喷涂质量的重要因素,文中根据自行研制的微弧等离喷涂系统,开展等离子喷枪的电热特性研究,分析了不同进气方式下的电弧伏安特性以及微弧等离子喷枪的热效率.结果表明,等离子喷枪在不同进气方式下均呈现下降的伏安特性,在相同电流和气体流量条件下,直流和切向混合进气方式下喷枪的电弧电压要高于单独采用直流和切向进气时电弧电压,电弧具有更高的能量密度.微弧等离子喷枪热效率为56%～76%,喷枪射流热焓为3.28～11.16 kJ/g.
The voltage-current characteristic and thermal efficiency of a plasma gun are key factors influencing the quality of the plasma spraying process.The electric and thermal characteristics of the newly developed micro-plasma torch were investigated.As one of the factors effecting the plasma arc voltage,gas injection was also researched in this paper.The plasma arc voltage for the radial injection mode is much lower than that of axial injection mode and the integrated mode.However,the currentvoltage characteristics of the plasma jet show a decreasing tendency in spite of the three gas injection modes.With the integrated mode,stable and long plasma jet with high heat energy was obtained.The thermal efficiency of the micro-plasma gun ranges from 56%to 76%,and the plasma enthalpy is 3.28 kJ/g～11.16 kJ/g.With designed special plasma gun structure and integrated gas injection mode,the plasma gun shows a high thermal efficiency and plasma enthalpy which is suitable for the coating preparation with high qualities.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第12期101-104,118,共4页
Transactions of The China Welding Institution
关键词
微弧等离子
进气方式
伏安特性
热效率
micro-plasma
gas injection mode
voltagecurrent characteristic
thermal efficiency
