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本文论述了由等离子体的光辐射亮度分布确定其温度分布的原理,并且测定了等离子喷涂枪出口处射流的温度分布。喷枪工作气体为氩氢或氮氢混合物,氢气含量为10～20%。实验表明:加入少量氢气可使喷枪功率及射流温度得到显著提高。加氢量超过10%以后,喷枪功率及射流温度的增长趋于缓慢。更大的加氢量甚至会使温度降低。
In this paper, the principle of determining the temperature distribution by the brightness distribution of the plasma optical radiation is discussed. The temperature distribution of the jet at the exit of the plasma spraying gun is also measured. The working gas of the spray gun is argon-hydrogen or nitrogen-hydrogen mixture, and the hydrogen content is 10-20%. Experiments show that: adding a small amount of hydrogen spray gun power and jet temperature can be significantly improved. After the hydrogenation amount exceeds 10%, the increase of gun power and jet temperature tends to be slow. Larger amounts of hydrogen even lower the temperature.