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采用红外测温仪检测单位时间内基体温度变化来衡量射流与粒子流(含粉末粒子的射流)的加热效应,实验研究了等离子弧电流、电压、熔射距离以及送粉速率变化对加热效应的影响规律,进而对比分析射流和粒子流与基体/已熔射涂层之间的热传递特性.实验结果表明:等离子熔射过程中的加热效应主要取决于射流引起的对流传热;粒子流的加热效应特点与射流不同,而粉末粒子仅对其沉积区域的温升有贡献;随着熔射距离的增加,射流的加热效应急速下降;等离子弧电流和电压的增大相应地提升了喷枪功率,加大了射流与基体间的对流传热.
The heating effect of jet and particle flow (jet containing powder particles) was measured by measuring the temperature of base body with infrared pyrometer. The influence of plasma arc current, voltage, melting distance and powder feeding rate on heating effect And then the heat transfer characteristics between jet and particle flow and the substrate / melted coating are compared.The experimental results show that the heating effect in the plasma spraying process mainly depends on the convection heat transfer caused by the jet flow, the particle flow The heating effect is different from that of the jet, while the powder particles only contribute to the temperature rise of the deposition area. The heating effect of the jet decreases rapidly with the increase of the fusion distance. The increase of the plasma arc current and voltage increases the gun power , Increase the convection heat transfer between the jet and the substrate.