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 oC 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 oC in air.

• 장빈(국민대학교 기계시스템공학부) | Bin Jang
• 이기성(국민대학교 기계시스템공학부) | Kee Sung Lee Corresponding author
• 김태우(국민대학교 기계시스템공학부) | Tae Woo Kim
• 김철(국민대학교 기계시스템공학부) | Chul Kim Corresponding author