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

The Korean Society of Mechanical Engineers (대한기계학회)
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Durability Evaluation of Thermal Barrier Coating (TBC) According to Growth of Thermally Grown Oxide (TGO)

TGO 성장을 고려한 열차폐코팅의 내구성평가

  • Song, Hyun Woo (School of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Moon, Byung Woo (School of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Choi, Jae Gu (School of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Choi, Won Suk (School of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Song, Dongju (School of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Koo, Jae-Mean (School of Mechanical Engineering, Sungkyunkwan Univ.) ;
  • Seok, Chang-Sung (School of Mechanical Engineering, Sungkyunkwan Univ.)
  • 송현우 (성균관대학교 기계공학부) ;
  • 문병우 (성균관대학교 기계공학부) ;
  • 최재구 (성균관대학교 기계공학부) ;
  • 최원석 (성균관대학교 기계공학부) ;
  • 송동주 (성균관대학교 기계공학부) ;
  • 구재민 (성균관대학교 기계공학부) ;
  • 석창성 (성균관대학교 기계공학부)
  • Received : 2014.03.19
  • Accepted : 2014.10.21
  • Published : 2014.12.01
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Abstract

The thermal barrier coating (TBC) applied to a gas turbine can be damaged by repeated thermal fatigue during operation, so an evaluation of its durability is needed. Thermally grown oxide (TGO) is generated inside the TBC in a high-temperature environment. The growth of TGO is known to be the main cause of damage to the TBC. Therefore, the durability of TBC should be evaluated according to the growth of TGO. In this research, Kim et al.'s work on the growth of TGO with aging was used as a basis for finite element analysis. The relationship between stress and aging was derived from the finite element analysis results. The durability of the TBC with aging was evaluated through a comparison between the results of the finite element analysis and a bond strength test.

가스터빈에 적용되는 열차폐코팅은 가동 중 반복적인 열피로에 의하여 파손되므로, 열차폐코팅의 내구성평가가 필요하다. 고온 환경에 노출된 열차폐코팅의 내부에는 열생성산화물(TGO)이 성장하게 되는데, 이러한 열생성산화물(TGO)의 성장은 열차폐코팅의 주요 파손 원인으로 알려져 있다. 따라서 TGO의 성장을 고려한 열차폐코팅의 내구성평가는 반드시 선행되어야 하는 연구이다. 본 연구에서는 김대진등의 연구 결과로부터 열화시간에 따른 TGO 성장을 고려하여 유한요소해석을 수행하였으며, 이로부터 응력과 열화시간 사이의 관계를 도출하였다. 또한 열화시간에 따른 유한요소해석 결과와 김대진 등의 접착강도 시험 결과의 비교를 통하여 열차폐코팅의 내구성을 평가하였다.

Keywords

References

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