Abstract
In this study, five Cr–Ti–B–N thin films with different B/(Cr+Ti) ratios ranging from 0.1 to 0.69 were fabricated on silicon substrates and AISI420 stainless steel disks by pulsed DC magnetron sputtering using the Cr and TiB2 targets. It was found that the B content had strong influences on the structures and mechanical properties of Cr–Ti–B–N coatings. When the boron content reached 17at.%, the microstructure changed from the nanocolumnar structure to a nanocomposite structure with nanograins around 4nm in diameter embedded in the amorphous matrix. As compared with Cr–B–N coating, the solution hardening effect was found to result from the addition of Ti element. The average surface roughness, hardness and elastic modulus of Cr–Ti–B–N film decreased with increasing B content due to the amorphous BN phase. No chipping failures were found adjacent to the scratch track or indentation craters of each coating. In this study, the 37.3 Cr-2.3 Ti-4.0 B-56.0N (in at.%) coating provided an optimal combination of hardness, wear resistance and adhesion.
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