抄録
Thermal Barrier Coating (TBC) is fabricated by thermal spray technology. In this technology, coating particles are melted in high-temperature plasma flow, impinged and deposited continuously to a substrate surface. Since a coating layer is formed by this way, it seems that the microstructure and the mechanical properties of TBC are affected by the spray condition and high-temperature environment in service. In this study, the substrate temperature and the particle velocity of the coating particle in plasma flow as the spray condition are varied. Coefficient of thermal expansion, elastic modulus, crack length, Vickers hardness, porosity, bending strength and residual stress of the ceramic layer are measured for as-sprayed specimen. In addition, thermal exposure tests are conducted to examine influence of exposure temperature on the mechanical properties of TBC.
