Abstract
Transpiration cooling system for gas turbine blade applications has significant benefit for reducing the amount of cooling air and increasing cooling efficiency. We had developed the porous ceramic coating using a plasma spraying process, which can infiltrate a cooling gas and control the loss of coolant gas pressure, for the transpiration cooling system. The ceramic coating deposited with the mixture of 8wt% ytrria stabilized zirconia and polyester powders showed superior permeability for cooling gas and therefore to lead to considerable reduction of the substrate temperature based on the transpiration cooling mechanism. The adhesion strength of the porous ceramic coating was showed to be the almost same level as that of the ceramic coating utilized in current gas turbine components. In this study, the oxidation property of the porous ceramic coating in an isothermal exposure environment is examined in comparison with that observed in TBC.
