Effect of surface macroroughness on the microstructure and sliding wear properties of Al2O3 + 13 wt.% TiO2 thick coatings

ABSTRACT
 
 Two macro-roughness patterns namely spiral grooving and diamond knurling were performed on an AISI/SAE 1045 cylindrical steel bar. Al2O3 + 13 wt.-% TiO2 powder was deposited by utilizing a multi-pass torch. Microstructure, microhardness wear resistance analyzed. The presence of both γ-Al2O3 α-Al2O3 throughout the coating promoted partially melted un-melted particles; however, formation interlayers hard influenced re-heating during torch causing transformation from γ-Al2O3→α-Al2O3. Knurling pattern specimens contained less defects owe to suitable splat accommodation thus strengthening inter-splat anchorage. improved sliding combination (toughness) (hardness) phases and, predominantly reduced porosity micro-cracks in with pattern.