Abstract
In the present work, Co-base powder was modified with 10%wt CrC addition in order to study the effect of CrC addition. These coatings were deposited by flame spraying process. The effect of CrC addition on Vickers hardness and erosive wear behavior of the deposited coatings was studied. The erosive wear behavior of flame sprayed coatings was investigated by response surface methodology. To investigate and develop the erosive wear model of the flame sprayed coatings four factors, namely velocity (V), impact angle (A), temperature (T), and feed rate (F), each factor at three levels, were used. Analysis of variance was carried out to determine the significant factors and interactions. Investigation showed that the composition, velocity, impact angle, temperature, and feed rate were the main significant factors while velocity-feed rate and impact angle - feed rate were the main significant interactions. Thus, an erosive wear model was developed in terms of main factors and their significant interactions. The validity of the model was evaluated by conducting experiments under different wear conditions. A comparison of modeled and experimental results showed 3-8% error. The CrC addition improves the erosive wear resistance of the coatings. This is due to an increase in hardness of the flame sprayed coatings with the addition of CrC.
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