Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Changes in the Mechanical Behavior of Thermal Barrier Coatings Caused by Thermal Shock

열충격에 의한 열차폐 코팅재의 기계적 거동 변화

  • Jang, Bin (School of Mechanical Systems Engineering, Kookmin University) ;
  • Lee, Kee Sung (School of Mechanical Systems Engineering, Kookmin University) ;
  • Kim, Tae Woo (School of Mechanical Systems Engineering, Kookmin University) ;
  • Kim, Chul (School of Mechanical Systems Engineering, Kookmin University)
  • 장빈 (국민대학교 기계시스템공학부) ;
  • 이기성 (국민대학교 기계시스템공학부) ;
  • 김태우 (국민대학교 기계시스템공학부) ;
  • 김철 (국민대학교 기계시스템공학부)
  • Received : 2016.11.03
  • Accepted : 2016.11.18
  • Published : 2017.01.27
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Abstract

This study investigates changes in the mechanical behaviors, especially hardness and indentation load-displacement curves, of thermal barrier coatings (TBCs) brought about by thermal shock. The TBCs on the Nickel-based bondcoat/superalloy was prepared with diameters of 25.4 mm and $600{\mu}m$ thickness. The results of thermal shock cycling test from $1100^{\circ}C$ of the highest temperature indicate that the thermal shock do not influence on the mechanical behavior, but a continuous decrease in porosity and increase in hardness were observed after 1200 thermal shock cycles; these changes are believed to be due to sintering of thermal barrier coating materials. The results that no degradation in the indentation load-displacement curves indicate that the coating shows good thermal shock resistance up to 1200 cycles at $1100^{\circ}C$ in air.

Keywords

References

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