Abstract
The impact resistance of the WC-17Co coating as a function of high-velocity oxy-fuel thermal spraying process parameters was studied and presented in this paper. Design of experiments using Taguchi method and ANOVA were used for optimizing process parameters including grit type, spray distance, oxygen flow rate, carrier gas flow rate, powder feed rate, substrate preheat temperature and coating thickness to attain the maximum impact resistance in the coating. A falling mass impact tester apparatus was designed and fabricated for measuring the impact energy that was absorbed by each coating before failure. After each test, the cracks of each coating were observed under an optical microscope. According to the results, grit type was the most influential factor on increasing the impact resistance of the coatings and the effects of carrier gas flow rate, powder feed rate and substrate preheat temperature on impact resistance of the coatings were found to be negligible. The result of confirmation test showed that Taguchi method was a useful approach in predicting optimum parameters.
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