Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Thermal Fatigue Behavior of Thermal Barrier Coatings by Air Plasma Spray

대기플라즈마 용사법으로 제조된 열차폐코팅의 열피로특성 평가

  • Lee, Han-sang (Strategic Technology Laboratory Korea Electric Power Research Institute) ;
  • Kim, Eui-hyun (Strategic Technology Laboratory Korea Electric Power Research Institute) ;
  • Lee, Jung-hyuk (Gas Turbine Technology Service Center Korea Plant Service and Engineering Co. Ltd,)
  • Received : 2008.01.08
  • Published : 2008.06.22
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Abstract

Effects of top coat morphology and thickness on thermal fatigue behavior of thermal barrier coatings (TBC) were investigated in this study. Thermal fatigue tests were conducted on three coating specimens with different top coat morphology and thickness, and then the test data were compared via microstructures, cycles to failure, and fracture surfaces. In the air plasma spray specimens (APS1, APS2), top coat were 200 and $300{\mu}m$ respectively. The thickness of top coat was about $700{\mu}m$ in the perpendicular cracked specimen (PCS). Under thermal fatigue condition at $1,100^{\circ}C$, the cycles to top coat failure of APS1, APS2, and PCS were 350, 560 and 480 cycles, respectively. The cracks were initiated at the interface of top coat and thermally grown oxide (TGO) and propagated into TGO or top coat as the number of thermal fatigue cycles increased. For the PCS specimen, additive cracks were initiated and propagated at the starting points of perpendicular cracks in the top coat. Also, the thickness of TGO and the decrease of aluminium concentration in bond coat do not affect the cycles to failure.

Keywords

Acknowledgement

Grant : 1500℃급 가스터빈 고온고정부품 재생정비 기술개발

Supported by : 산업자원부

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