SURFACE LAYER OF DYNAMIC AND STATIC VANES

PURPOSE:To develop the heat resistant alloy dynamic and static vanes of a gas turbine having excellent heat resistance and oxidation resistance by forming an alloy layer of a specific compsn. and a ceramic layer of ZrO2.Y2O3 ceramics and Al2O3, Cr2O3, etc., on the surfaces of the dynamic and static vanes. CONSTITUTION:The alloy consisting, by weight %, 20 to 25% Cr, 6 to 8% Al, 0.5 to 1% Y and the balance Ni or Ni and Co is plasma thermally sprayed under a low pressure at 20 to 50mum on the outside surfaces of the Ni or Co heat resistant dynamic and static vanes of the gas turbine. The ZrO2-Y2O3 ceramics consisting of 8 to 20% Y2O3 and the balance ZrO2 coated by atm. plasma thermal spraying thereon. Further, the surface thereof is coated with the ceramics such as Al2O3, Cr2O3, MgO, CaO and SiO2, at 10 to 50mum thickness by a chemical vapor deposition or low pressure thermal plasma spraying. The heat resistance, oxidation resistance and corrosion resistance of the dynamic and static vanes are greatly improved.