S. Shin, C. Lee, Hanyang University, Seoul, South Korea; H. Kim, RIST, Pohang, South Korea
Differences in the deposition efficiency of individual powders in a mixed composite powder during kinetic spray processes can cause differences between the composition of the starting powder and the final coating. The objective of this study was to ascertain an optimal process that minimized composition variation by controlling feed rate, spray distance and particle velocity using a mixed bronze-20vol.%diamond composite feedstock. According to the analyses of the coating’s microstructure and deposition efficiency, high deposition efficiency and dense coatings were obtained by increasing the gas pressure for high impact velocity of particles. The coating composition remained nearly the same as the initial feedstock composition in an optimum condition was applied.
