Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference (한국윤활학회:학술대회논문집)

Korean Tribology Society (한국트라이볼로지학회)
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Frirtion and wear properties of plasma-sprayed $Cr_2$$O_3$ composite coatings at high temperature

$MoO_3$가 첨가된 $Cr_2$$O_3$, 플라스마 용사코팅의 고온 마찰 마멸 특성

  • Lyo, I. W. (Tribology Research Center, Korea Institute of Science and Technology) ;
  • Ahn, H.-S. (Tribology Research Center, Korea Institute of Science and Technology) ;
  • Lim, D. S. (Department of Materials Science and Egnineering, Korea University)
  • 여인웅 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 안효석 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 임대순 (고려대학교 재료공학과)
  • Published : 2001.11.01
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Abstract

plasma-sprayed Cr$_2$O$_3$-based coatings containing MoO$_3$ were studied to gain a better understanding of the influence of MoO$_3$ composition in the coatings on their tribological behaviour. A reciprocal type tribo-tester was employed to examine friction and wear behavior of the specimens at high temperature(450。C). The physical characteristics of worn surfaces were investigated by scanning electron microscopy and chemical composition of the coating surfaces was analyzed using a X-ray photoelectron spectrometer. The results showed that friction coefficient of the MoO$_3$-added coatings were lower than those without MoO$_3$ addition. The larger protecting layers were observed at the worn surface of plasma spray coated specimens with MoO$_3$ addition. XPS analysis of the protecting layer indicated that MoO$_3$ composition was dominantly formed at the surface. MoO$_3$ composition in the protecting layer appears to be more favorable in reducing the friction.

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