다이아몬드 강화 Cr 기반 소재의 정량적 마모 특성 평가

Abstract

Diamond reinforced Cr-based coating has been proposed as wear-resistant materials. In this study, the friction and wear characteristics of diamond reinforced Cr-based coating are experimentally assessed. The experiments are performed using a pin-on-reciprocating plate tribo-tester under various normal forces with boundary lubrication. The stainless-steel ball is used as a counter material. Prior to the experiments, mechanical properties such as elastic modulus and hardness are determined using nanoscale instrumented indentation. The hardness of the specimen is further determined using a Vickers hardness tester. The specimens before and after the experiments are carefully observed using a confocal microscope to understand the wear characteristics. In addition, the wear volume and wear rate of the specimens are determined based on the confocal microscope data. The results show that the friction coefficients are 0.096–0.100 under 20–40 N normal forces. Furthermore, the wear rates of the diamond reinforced Cr-based coating and the stainless steel ball under 20–40 N normal forces are found to be 12.8 × 10-8 mm3/(Nm)–15.5 × 10-8 mm3/(Nm) and 1.9 × 10-8 mm3/(Nm)–3.9 × 10-8 mm3/(Nm), respectively. However, the effect of the normal force on wear rates is not clearly observed, which may be asso-ciated with the flattening of the ball. The results of the study may be useful for the tribological applicability of diamond reinforced Cr-based coating as wear-resistant materials.