Effect of Temperature on the Sliding Wear Behavior of HVOF Sprayed Al2O3 Composite Coating

Abstract

In present study, Al2O3-based composite coating has been deposited on mild steel substrate using HVOF thermal spray process in controlled process parameters. For analyzing the surface, FESEM of the developed coating was done. Its hardness, residual stresses, and tribological properties are studied at room temperature and at elevated temperature of 50, 100, and 150 °C. It is observed that with increased temperature its hardness, residual stresses, and tribological performance was enhanced, i.e., at 150 °C, wear and coefficient of friction decreased to a value of 120 μm and 0.35, whereas its hardness was 520 HV and residual stresses was −10 MPa, increased at evaluated temperature. This showed the temperature dependency of the coating, with increased temperature the coating showed better results.