| 학회 | 한국재료학회 |
| 학술대회 | 2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 | 23권 2호 |
| 발표분야 | D. 구조 재료 분과 |
| 제목 | Thermo-Chemical and Mechanical Properties of ZrO2 based Thermal Barrier Coatings for Gas Turbine Application |
| 초록 | Thermal barrier coatings (TBCs) have received a large attention because they increase the thermal efficiency of gas turbine engines by increasing the gas turbine inlet temperature and reducing the amount of cooling air required for the hot section components. To optimize TBCs for integration into gas turbines, characterization of the relationship between microstructure and thermal-mechanical properties of the coatings is necessary. Electron beam-physical vapor deposition (EB-PVD) is a widely used technique for depositing thermal barrier coatings (TBCs) on metal substrates for high temperature applications, such as gas turbines, in order to improve the thermal efficiency. This work describes the thermal conductivity and microstructure of ZrO2-4mol% Y2O3 (YSZ) coatings deposited by air plasma spray (APS) or EB-PVD (electron beam-physical vapor deposition). The mechanical properties of plasma sprayed YSZ coatings were evaluated by three-point bending method. The bending strength, Young’s modulus and residual stress depend on microstructure as well as coating distance. Specially, the high temperature capability of a TBCs used in a gas turbine is often degraded by deposits of CaO-MgO-Al2O3-SiO2 (CMAS). CMAS melts are produced when siliceous minerals (volcanic ash, dust and sand) are ingested with the intake air and deposited on the hot surface of TBCs. In addition, we examine the properties of hot corrosion of EB-PVD TBCs by volcanic ash. |
| 저자 | Byung-Koog Jang |
| 소속 | Research Center for Structural Materials |
| 키워드 | Thermal barrier coatings; ZrO<SUB>2</SUB>; Plasma spray; EB-PVD; Thermal conductivity; Hardness |
