Abstract
In order to achieve high functionality materials which indicate high fatigue and high tribological properties, two surface modifications, high carbon carburizing and DLC(Diamond Like Carbon) coating, was performed to low carbon steel(SCM415). However, there are some reports which are concerned that coated materials like DLC indicate low fa-tigue strength compared with substrate only due to high heating history during the coating process. So, in this study, in order to prevent the base material from decrease of fatigue strength, DLC was coated by using UBMS(Unbalanced Mag-netron Sputtering) method which can coat at low temperature. Furthermore, three types of DLC coated specimens with different coating structures were prepared. Rotational bending fatigue tests and friction-wear tests were carried out. It was clear that the friction coefficient of each specimens coated DLC stabilized under 0.1. And, the specimen coated DLC with 5μm thickness indicates the highest tribological properties because the DLC coating was transcribed on the opponent material during wear process. Furthermore, the decreases of fatigue strength were not observed for each coated specimens. It can be concluded that it is possible to achieve high functionality materials by performed DLC hybrid sur-face modification suggested in this search.
