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Evaluation of Bond Strength of Isothermally Aged Plasma Sprayed Thermal Barrier Coating

플라즈마 용사 열차폐 코팅의 열화에 따른 접착강도 평가

  • 김대진 (성균관대학교 기계공학부) ;
  • 이동훈 (성균관대학교 기계공학부) ;
  • 구재민 (성균관대학교 기계공학부) ;
  • 송성진 (성균관대학교 기계공학부) ;
  • 석창성 (성균관대학교 기계공학부) ;
  • 김문영 (한전 KPS(주) G/T 정비기술센터)
  • Published : 2008.07.01

Abstract

In this study, disk type of thermal barrier coating system for gas turbine blade was isothermally aged in the furnace changing exposure time and temperature. For each aging condition, bond tests for three samples were conducted for evaluating degradation of adhesive or cohesive strength of thermal barrier coating system. For as-sprayed condition, the location of fracture in the bond test was in the middle of epoxy which have bond strength of 57 MPa. As specimens are degraded by thermal aging, bond strength gradually decreased and the location of failure was also changed from within top coat at the earlier stage of thermal aging to the interface between top coat and TGO at the later stage due to the delamination in the coating.

Keywords

Thermal Barrier Coating;Degradation;Thermally Grown Oxide;Bond Test

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