【摘要】 采用原子发射光谱仪研究低压直流电弧热喷涂等离子体射流的特性。利用Stark展宽法采集Hβ谱线,使用其Δλ1/2来计算等离子射流中的电子密度,研究了氢气流量、输入功率和探测距离对等离子体射流中电子密度的影响。使用Saha方程计算热等离子体的电离程度,研究了功率/氢气流量与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电流强度的增大而增加;氢气流量增加可以明显提高等离子体射流的能量,但对电离程度影响不大。更多还原

【Abstract】 The characteristics of the low pressure direct current arc thermal spray plasma jet were analyzed by using optical emission spectra. The effects of different power levels,flow rates of H2 and detection distance on the electron number density of the thermal spray plasma jet were investigated.The electron number density of the plasma jet was determined using Δλ1 /2of Hβ(486. 13 nm) line.At the same time,the degree of ionization was analyzed using Saha equation,and the effects of H2 flow rate and arc electric current on the degree of ionization were discussed. The results show that the electron number density and ionization degree of the plasma increase with the increasing of the input power,and the increasing of H2 flow rate can enhance the energy of the plasma jet,but has a little effect on the degree of ionization.更多还原