Microstructure controls in Gadolinium Zirconate/YSZ double layers and their properties

DOI Web Site 被引用文献1件
  • LEE Kee Sung
    School of Mechanical Systems Engineering, Kookmin University
  • LEE Dae Hyung
    School of Mechanical Systems Engineering, Kookmin University
  • KIM Tae Woo
    School of Mechanical Systems Engineering, Kookmin University

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In this study, a double-layer thermal barrier coating was designed and deposited by an electron beam physical vapor deposition technique. The microstructure was controlled by using different target ingots during the electron beam physical vapor deposition process. The double layer coating consists of Gd2Zr2O7 for the top layer and YSZ for the bottom layer. The microstructure, hardness, and thermal shock properties of the double layer deposited using a single-ingot process were compared with the results obtained with the two-ingot process. The single-ingot process involves forming the Gd2Zr2O7/YSZ double layer using a single YSZ/Gd2Zr2O7 double-layered ingot. The two-ingot process involves coating with each of the YSZ and Gd2Zr2O7 ingots. While the XRD results indicated that the same pyrochlore-fluorite structures are formed in those ingots, differences in the microstructure and composition were observed by FE-SEM and EDS analyses. These differences influence the hardness and thermal shock resistance of the coating. The results indicate that the finer singular columns produced by the two-ingot process do not improve the hardness, but delay the delamination of the top layer during thermal shock tests due to residual compressive stress and strain tolerance.

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