Abstract
Silicon-containing coatings with a matrix consisting of the saturated γ solid solution Ni 6Cr 2Si 2 and which also contain intermetallics of complex tantalum silicides as precipitates show great promise as protective layers for nickel-based alloys with improved oxidation and hot corrosion resistance. We present results of oxidation tests performed at 1000°C for up to 4000 h in air and of hot corrosion tests in burner gas with intermediate dipping in Na 2SO 4 and V 2O 5 melts. From silicon diffusion data, lifetimes greater than 10 000 h at 1000°C can be expected.
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