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采用超音速等离子喷涂工艺制备了氧化铝涂层,借助热喷涂粒子状态在线监测系统Spraywatch-2i、扫描电镜(SEM)和显微硬度仪(HVS-100)研究了电弧功率及其匹配对氧化铝粒子温度、速度及涂层组织性能的影响。试验结果表明:粒子的温度、速度随功率的增大分别呈持续上升与先上升后下降的趋势;在相同功率下,电流对粒子速度、温度的影响要大于电压对其的影响,温度、速度的变化趋势与电流变化趋势一致,随着电流的增大、电压的减小,这种变化逐渐趋于平缓,60kW为超音速等离子喷涂制备Al2O3涂层的最佳功率参数。
Alumina coatings were prepared by supersonic plasma spraying process. The effects of arc power and its matching on the thermal conductivity of alumina were investigated by means of Spraywatch-2i, scanning electron microscopy (SEM) and microhardness tester (HVS-100) Effect of particle temperature, velocity and coating microstructure and properties. The experimental results show that the temperature and velocity of particles increase with the increase of power and then decrease first and then decrease. At the same power, the influence of current on particle velocity and temperature is greater than that of voltage. The temperature, velocity The trend is consistent with the trend of current change. With the increase of current and voltage, the change tends to be gentle. The optimal power parameters of Al2O3 coating prepared by supersonic plasma spraying are 60kW.