Effect of CeO 2 Addition on Wear Behavior of Flame Sprayed Coatings

MEC 1240A Ni base alloys are being widely used to improve the wear resistance of various industrial components in high temperature and in corrosive environment. Addition of rare earth elements like CeO 2 further improves the wear, corrosion, and oxidation resistance of these alloys. In the present work, commercially available Ni base powder (MEC 1240 A) was modified with the optimum addition of rare earth element CeO 2 . Rare earth addition refines microstructure and increases hardness of the coatings. Abrasive wear of rare earth modified flame sprayed coating, and the effect of load, abrasive size, and sliding speed on abrasive wear of these coatings was investigated by Response Surface Methodology (RSM). For this purpose, three factors load (L), abrasive size (A) (size in ΅m), and sliding speed (S) (m/ min) with three levels of each factor were used for investigation. Analysis of variance was carried out to determine the significant factors and interactions. Investigation showed that the load, abrasive size, and sliding speed were the main significant factors, while load and abrasive size, load and sliding speed, abrasive size, and sliding speed were the main significant interactions. The interaction effects are one order less than the main factor effects. Thus, an abrasive 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 2-7% error.