化学蒸着法によって形成したガスタービン翼用高温耐食性NiAlコーティング
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NiAl was deposited by reduced pressure CVD to form hot corrosion resistant coatings for the cooling pessages of heavy duty gas turbine buckets.AlCl3 and AlCl were used as chemical reaction gases with H2 gas as carrier gas. An NiAl coating layer was formed by deposition and subsequent diffusion of Al into Ni base superalloy. Optimum coating conditions were surveyed to obtain a uniform coating thickness for the complex shaped cooling passage utilizing a simulation model.It was found that in the model bucket cooling passage the ratio of NiAl layer thickness at the outlet to that at the inlet was about 45% under coating conditions of 950-1000°C and 20-40Torr and using a reverse flow prevention device.
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