Effect of load on the wear behaviour of Al2O3HVOF sprayed coating

Abstract

Al2O3 HVOF sprayed coating has been deposited with controlled process parameters. SEM characterization was used to characterize the deposited coating. Wear, Residual stresses, COF and hardness, are studied at variable load of 40, 50, 60 and 70N. Surface morphology of Al2O3 HVOF coating shows a molten and un-molten powder with curved laminar structure and confirm homogeneous coating. Experimental results revealed that with increase in load wear, hardness, residual stresses, and COF results were enhanced at higher load (70N). Experimental result shows wear value reduces to 80 microns and COF decreased to 0.25, while hardness and residual stresses increased to 470 HV and -20 MPa respectively. The experimental test results reveal that decrease in COF and wear may be occurs oxide layer formation or due to tribo-film formation under increasing load condition