화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.27, No.1, 25-31, January, 2017
열충격에 의한 열차폐 코팅재의 기계적 거동 변화
Changes in the Mechanical Behavior of Thermal Barrier Coatings Caused by Thermal Shock
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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.
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