Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Friction and Wear Characteristics of Plasma Coated Surface of Casting Aluminum Alloy

플라즈마 코팅한 주조용 알루미늄합금의 마찰 및 마멸특성

  • Chae, Young-Hun (Dept.of Mechanical Engineering, Graduate School of Kyungpook National University) ;
  • Ren, Jing-Ri (Dept.of Mechanical Engineering, Graduate School of Kyungpook National University) ;
  • Park, Jun-Mock (Dept.of Mechanical Engineering, Graduate School of Kyungpook National University) ;
  • Kim, Seock-Sam (Dept.of Mechanical Engineering, Kyungpook National University)
  • 채영훈 (경북대학교 대학원 기계공학과) ;
  • 임정일 (경북대학교 대학원 기계공학과) ;
  • 박준목 (경북대학교 대학원 기계공학과) ;
  • 김석삼 (경북대학교 기계공학부)
  • Published : 1997.01.01
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Abstract

The wear characteristics and wear mechanisms of plasma sprayed Al/sub 2/ O/sub 3/-40%TiO/sub 2/ and Cr/sub 2/O/sub 3/ deposited on casting aluminum alloy(AC4C) were investigated. Specimens were processed for various coating thicknesses. Ball on disk type wear tester was used for wear test. The scratch test on plasma sprayed coating surface showed that critical load to break the coating layer was greater than 40 N. The critical load increase with the increase of coating thickness of specimens. The friction coefficient of Cr/sub 2/O/sub 3/ coating layer was less than that of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer. The wear resistance of Cr/sub 2/O/sub 3/ coating layer was greater than that of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer. Microscopic observation of worn surfaces was made by SEM. SEM observation showed that the main mechanism of wear for Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer was abrasive wear under 50 N. For the case of Al/sub 2/O/sub 3/-40%TiO/sub 2/ coating layer, as the surface cracks perpendicular to sliding direction propagated, the wear debris was generated in wear track. However, the main mechanism of wear for Cr/sub 2/O/sub 3/ coating layer was brittle fracture under 150 N.

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