大气下热喷涂等离子体电子密度的光谱诊断

利用直流电弧放电装置产生了大气压下热喷涂等离子体,采用原子发射光谱法测量热喷涂等离子体射流中的辐射强度.通过Stark展宽法,使用ArΙ谱线在430 nm处的Δλ_1/2(谱线的半宽高)对大气压力下热喷涂等离子体射流中电子密度进行计算,研究了不同氩气流量及不同输入功率对等离子体电子密度的影响;同时使用Saha方程计算氩等离子体的电离程度,研究气体流量和电流与氩等离子体电离程度的关系.结果表明,电子密度和电离程度随着等离子体喷枪输入功率的增加而增加,而随着气体流量增加时,电子密度略有增加而电离程度会减少.

Spectral diagnostics of electron number density in plasma jet under atmosphere thermal plasma spray

A direct current atmospheric plasma spray was conducted at different power levels and flow rates of argon plasma gas. In this paper,electron number density of the plasma jet was determined using Δλ_1/2 of the Ar I (430 nm) line,and the effect of different power levels and flow rates of Ar plasma gas on the electron number density in the thermal spray plasma jet was investigated. Meanwhile,the degree of ionization of Ar atom was analyzed using Saha equation,and the relations between the degree of ionization,the gas flow and arc electric current were discussed. The results show that the electron number density increased with increasing the plasma input power and Argon content of the plasma gas,while the degree of ionization increased with the increase of the plasma power but decrease of the Argon flow rate.