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논문 기본 정보

자료유형
학술저널
저자정보
Dipak Kumar (RKGIT) K. N. Pandey (Motilal Nehru National Institute of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12
발행연도
2021.12
수록면
5,322 - 5,334 (13page)
DOI
10.1007/s12540-020-00829-z

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초록· 키워드

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In this work, the effect of sol?gel deposited top-coat on thermal fatigue resistance of thermal barrier coatings (TBCs) subjectedto thermal fatigue loading is evaluated experimentally. To obtain non-conventional sol?gel thermal barrier coatings(SGTBC), coated samples underwent thermal fatigue loading at 1100 °C for 10 min heating and cooling. The tested sol?gelthermal barrier coatings were then compared to conventional air plasma sprayed (APS) thermal barrier coatings as well. Thelife of samples was investigated as a function of number of sustaining thermal cycles to times. Furthermore, the performedexperiment was analyzed using scanning electron microscope, energy dispersive spectroscopy and X-ray diffractometer. Theobtained results indicated that the non-conventional sol?gel thermal barrier coatings exhibited 1.46 times better thermalfatigue life in IN800SGTBC against 1.31 times thermal fatigue life of IN718SGTBC but overall thermal fatigue life wasfound to be better in IN718 SGTBC, signified effects of metallic substrates in thermal fatigue life determination. However,the nanostructured SGTBC had higher thermal cyclic resistance than conventional APS TBC, resulted in improved lifetimeindicating the increased adherence at the substrate interface. Results also showed that the dominant failure mechanism ofTBCs was destabilization of top-coat (YSZ), resulting composition of (Al, Cr)2O3 and spinel as reaction products for depletingY2O3producing from yttria stabilized zirconia (YSZ). Furthermore, the results showed that the amount of the porositypercent in the sol?gel TBCs was 2.3% higher than the conventional TBCs.

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