等离子喷涂Al_2O_3陶瓷涂层的工艺研究

Research on the Process of Plasma Sprayed Al_2O_3 Ceramic Coatings

采用SprayWatch-2i粒子测速仪测定等离子喷涂时粒子的飞行速度及温度,确定最佳喷涂电流和电压参数,改变送粉方式和送粉速率制备Al2O3涂层.研究所制备涂层的孔隙率、显微硬度、耐磨性及结合强度,研究结果指出:影响Al2O3涂层质量的主要工艺参数为喷涂功率、送粉方式和送粉速率,等离子喷涂10～40μmAl2O3粉末制备Al2O3陶瓷涂层的最佳工艺参数为电流600 A、电压60 V、枪内送粉、送粉速率10.25 g/rmin.

The optimum parameter of current and voltage of plasma spraying was obtained according to the velocity and temperature of particles in-flight in plasma jct determined by SprayWatch-2i velometer. A12O3 ceramic coatings were prepared by varying the feeding way and speed rate of powders. Studying the coating properties, such as porosities, microhardness, wear resistance, bonding strength, it showed that the power of plasma spraying, feeding way and feeding rate are the key processing parameters. The optimum processing parameters of preparing Al2O3 ceramic coatings with particle size 10-40 μm of Al2O3 powder are： current 600 A, voltage 60 V, powder feeding inside gun and feeding speed 10.25 g/min.