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열차폐코팅의 미세구조가 TGO 계면 응력에 미치는 영향 평가를 통한 미세구조 형상 설계
김담현,박기범,위성욱,김기근,박수,석창성,Kim, Damhyun,Park, Kibum,Wee, SungUk,Kim, Keekeun,Park, Soo,Seok, Chang-Sung 한국군사과학기술학회 2020 한국군사과학기술학회지 Vol.23 No.5
Thermal barrier coating(TBC) applied to fighter and turbine engines is a technology that improves the durability of core parts by lowering the surface temperature of base material. The thermal stress caused by mis-match of the coefficient of thermal expansion between the top coating and the TGO interface is the main cause of TBC breakage. Since the thermal stress is dependent on the microstructure of the TBC, designing microstructure of TBC can improve the durability as well as lower the thermal stress. In this study, the effect of coating thickness, volume of porosity and vertical cracking on the thermal stress was analyzed through finite element analysis. Through the analysis results, a design range of a microstructure that can improve the durability of thermal barrier coating by lowering thermal stress is proposed.
이정민(Jeong-Min Lee),송현우(Hyunwoo Song),윤정한(Junghan Yun),위성욱(Sunguk Wee),김용석(Youngseok Kim),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.7
A gas turbine is a power plant unit that converts thermal energy into rotational energy by rotating a blade using hightemperature and high-pressure combustion gas. A gas turbine blade is directly exposed to a high-temperature flame. Various studies have aimed to improve the durability of the blade in harsh conditions. One proposes coating the blade with a thermal barrier to protect it from the flame, using a ceramic material with better thermal insulation. Another proposes using internal cooling, by creating an air flow path inside the blade to lower its temperature. Because both these techniques create a thermal gradient in the cross section of the blade, they amplify the difference in thermal expansion, thereby producing thermal stress in the blade and the thermal barrier coating. This study investigates the internal cooling effect on thermal gradient fatigue by using finite element analysis.