Abstract
The friction and wear characteristics of plasma-sprayed NiO–CaF2 coatings on Incomel 601 substrates were studied at 760 °C and load of 5.17×104 N/m2. The rubbing surface was a lithia alumina silicate ceramic matrix simulating a rotating heat exchanger for use in automotive gas turbines. Average friction coefficients varied from 0.28 to 0.58 with coating wear rates of 0.2 to 2.1×10−3 cm/100 h. Optimum wear performance was achieved for the prespray composition 92/8 weight % NiO/CaF2.
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