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Changes in the Mechanical Behavior of Thermal Barrier Coatings Caused by Thermal Shock

열충격에 의한 열차폐 코팅재의 기계적 거동 변화

Bin Jang
,
Kee Sung Lee†
,
Tae Woo Kim
,
Chul Kim†
장 빈
,
이 기성†
,
김 태우
,
김 철†
School of Mechanical Systems Engineering, Kookmin University, Seoul 02702, Republic of Korea
국민대학교 기계시스템공학부
†Corresponding author E-Mail : keeslee@kookmin.ac.kr (K. S. Lee, Kookmin Univ.) ckim@kookmin.ac.kr (C. Kim, Kookmin Univ.)
January 2017. pp. 25-31
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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 μm thickness. The results of thermal shock cycling test from 1100 °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 °C in air.

Keywords
superalloy
coatings
thermal shock
mechanical properties
indentation
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 27
  • No :1
  • Pages :25-31
  • Received Date : 2016-11-03
  • Revised Date : 2016-11-17
  • Accepted Date : 2016-11-18
  • DOI :https://doi.org/10.3740/MRSK.2017.27.1.25
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