| Abstract |
| WC-Co coatings have been deposited by detonation gun thermal spraying of conventional (WC-12 wt.%Co) and nanocomposite MC-8 wt%Co) powders and wear properties were compared each other. Various stand-off distances and fuel amounts were used in order to control phase composition and microstructure of nano WC-Co coatings. Phase decomposition of WC in nano coatings into W₂C and free W was observed due to hot detonation wave during spraying process and amounts of W₂C phase increased in longer stand-off distance. The microstructure of nano-coatings, such as porosity and hardness, was widely varied according to fuel amounts. Most dense nano-coatings exhibited higher hardness and wear resistance than those of conventional coatings. Nano-coatings showed different wear behavior from conventional coatings due to extremely small carbide size. (Received March 5, 2004) |
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| Key Words |
| WC-Co, Thermal spraying, Nano-Particle, Wear resistance |
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