| Title |
Wear Properties of WC-Co Nano-particle Coatings Fabricated by Detonation Gun Spraying |
| Authors |
박성용(Seong Yong Park); 박찬경(Chan Gyung Park) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
WC-Co; Thermal spraying; Nano-Particle; Wear resistance |
| 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) |