Investigation of alumina splats formed in the induction plasma process

摘要

The investigation of the flattening behavior of A1{sub}2O{sub}3 particles melted in the inductionplasma process was reported. Three typical morphologies of alumina splats were recognized:mushroom-like, pancake-like, and flower-like types. Through the conduct of a 2{sup}4 factorialdesign of experiments, it was determined that the important factors controlling the deformation ofsplats are the pressure in the spray chamber, the spraying distance, and the powder size. Interactionsamong these three factors are significant. Using plasma diagnostic techniques, the relation betweenthe splat morphology and the surface temperature and velocity of particles prior to impingement onthe substrate was established.