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

Korean Tribology Society (한국트라이볼로지학회)
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Evaluation of the characteristics of plasma sprayed ceramic coatings by Indentation test

압입 시험에 의한 플라즈마 세라믹 용사코팅의 특성 평가

  • Choi, Se-Young (Graduate School, Department of Mechanical Engineering, Kyungpook National University) ;
  • Chae, Young-Hun (Engineering Tribology Research Institute in Kyungpook National University) ;
  • Kim, Seock-Sam (School of Mechanical Engineering, Kyungpook National University)
  • 최세영 (경북대학교 기계공학과 대학원) ;
  • 채영훈 (경북대학교 트라이볼로지 연구소) ;
  • 김석삼 (경북대학교 기계공학부)
  • Published : 2002.05.16
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Abstract

The most controversial topics in plasma sprayed ceramic coating system are recently mechanical properties such as bond strength, cohesive strength, toughness and so on. Determination of bond strength of coatings is one of the most important problems. In the industry, the bond strength of coating system has been estimated by Pull-off test(ASTM standard C633-79). But, without a fixed jig and specimen, it is impossible to obtain the bond strength. Therefore, it is necessary to study the critical fracture load on interface of the coating by indentation test. Because the critical fracture load plays an important role in evaluating the bond strength for plasma sprayed ceramic coating system. So, we have estimated critical fracture load in plasma sprayed ceramic coating system, and it was shown that inverse relationship between the cross-section hardness of coating and the critical fracture load(Pc). In case of the high load(1kgf, 2kgf) in $Al_{2}O_{3}+13%TiO_{2}$, it was found that the critical point(Pco), which the coating was broken on.

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