| MoO3가 첨가된 Cr2O3 플라즈마 용사코팅의 고온 마찰 마멸 특성 |
| 여인웅, 안효석, 임대순1 |
한국과학기술연구원 트라이볼로지연구센터
1고려대학교 재료공학과 |
| Friction and Wear Properties of Plasma-sprayed Cr2O3-MoO3 Composite Coatings at High Temperature |
| In-Woong Lyo, Hyo-Sok Ahn, Dae-Soon Lim1 |
Tribology Research Center, Korea Institute of Science and Technology
1Department of Material Science and Engineering, Korea University |
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| ABSTRACT |
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Tribological behavior of plasma-sprayed $Cr_2O_3$-based coatings containing $MoO_3$ at 450$^{circ}C$ was investigated to understand the influence of $MoO_3$. A reciprocal disc-on-plate type tribo-tester was employed to examine fricition and wear behavior of the specimens. The microstructure and phase composition of the coating was characterized with Transmission Electron Microscopy(TEM). The TEM analysis indicated that $MoO_3$ was dispersed into the grain boundary, resulting in the increase of the hardness and density of the coating. Worn surfaces were investigated by scanning electron microscopy and chemistry of the worn surfaces was analyzed using a X-ray Photoelectron Spectrometer(XPS). The results showed that the friction coefficient of the $MoO_3$-added coatings was lower than that without $MoO_3$ addition. The larger protecting layers were observed at the worn surface of plasma spray coated specimens with $MoO_3$ composition in the protecting layer appears to be more favorable in reducing the friction. |
| Key words:
Plasma-sprayed coatings, $Cr_2O_3$, $MoO_3$, Friction, Wear |
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