Abstract
We have studied the effect of substrate surface roughness and coating thickness on the adhesion and tribological behaviour of TiN deposited by reactive ion plating on steel substrates. Three coating thicknesses (1.5, 3 and 5 μm) and three substrate surface finishes ( R a = 0.02, 0.15 and 0.35 μm) were tested. Scratch tests show that coatings on substrates with a poor surface finish show worse adhesion than on those with a smooth surface. Sliding friction tests were conducted with a pin-on-disc tribometer. The pin was a ball of 100C6 steel or alumina. The results show that adhesion takes place at the TiN coating/steel interface followed by metal transfer onto the ceramic. Wear of the steel increases with increasing TiN coating thickness and substrate surface roughness. Adhesion also occurs when TiN is in sliding contact against alumina. The latter did not suffer any wear while the TiN coating suffered adhesive wear. Large TiN transfer was detected on alumina. The results show that, for a given coating thickness, the wear of the coating is as important as the roughness of the substrate is high. In addition, the coating thickness of 3 μm shows better resistance to wear compared to the two other thicknesses.
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