G040023 Influence of ambient pressure on flattening/solidification behavior of thermal sprayed particles

Abstract

In this study, the effect of ambient pressure and substrate temperature on flattening behavior of thermal sprayed particles was investigated. Mirror polished SUS304 substrates were preheated in a range from 300K to 550K. Ambient pressure was controlled in a range from 1.5kPa to 101.3kPa. Powder materials, Ti, Cr, Ni and Cu with purity 99%, were sprayed onto the substrate surface to examine the influence of the material physical properties on the flattening. Splat morphology changed from the splash shape to the disk one with decrease of ambient pressure and increase of substrate temperature. The material, which forms oxide easily, has a tendency in forming disk splat preferentially. It was found that wettability of the substrate by the sprayed particles may dominate the flattening.