Abstract
The aim of this work is to enhance the operation life of steel (CF8M) used in turbines. The steel during its operation in power plant undergo severe wear due to erosion. This decreases the life of component as well adds the maintenance cost of hydro-plant. To overcome this problem of erosion and wear, HVOF thermal spray technique is selected to apply the protective layer of WC-Co-Cr on the substrate material. Wear test were done on slurry erosion test rig at different slurry concentrations, slurry jet impingement angles and spray nozzle stand-off distances for coated and uncoated substrates. The orthogonal L4 array was used to design the experimentation after selecting suitable maximum and minimum values of parameters. The wear loss measurements were taken in terms of weight loss after completion of every cycle. The SEM analysis of as such coated samples and eroded samples was done to know the morphology of the surfaces. It was found that the wear resistance of WC-10Co-4Cr coated against slurry erosion on CF8M steel was better than the uncoated substrate.
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