Abstract
TZM alloy possesses high strength at elevated temperature but due to high volatility of its oxide, MoO3 the alloy undergoes catastrophic oxidation in air above 700°C. In the present study, development of high temperature oxidation resistant MoSi2 coating over TZM alloy was investigated by slurry coating technique. As-coated TZM alloy by Si powder was exposed to thermal treatment at 1200°C to develop MoSi2 coating. Characterization studies like surface, cross section morphologies, phase identification, evaluation of hardness, adhesive strength, oxidation resistance etc. were carried out to determine the quality of coatings. A double layered coating structure was obtained with thick outer surface layer of MoSi2(thickness ∼ 60 μm) and thin interfacial layer of Mo5Si3 (thickness ∼ 5 μm). The coating showed good adhesion strength (∼ 25 MPa) and stable oxidation resistance with negligible mass gain at 1000°C in air.
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