Abstract
Various typical polymer materials, such as nylon and polyethylene, have received much attention due to their attractive outstanding properties, including good corrosion resistance and low friction coefficient. In this research, polyamide 6, polyamide 66, polyamide 46, polyoxymethylene, high-density-polyethylene and low-density-polyethylene were used as substrates, and they were coated with a diamond-like carbon (DLC) film by a magnetron RF sputtering technique. Their tribological properties were evaluated by a ball-on-disk type friction test technique. The results show that the wear properties of the polyamide 46, polyoxymethylene and high-density-polyethylene coated with DLC film had not been improved. However, the friction coefficients decreased by 1/10 for polyamide 6, 1/6 for polyamide 66 and 1/2 for low-density-polyethylene in the friction tests after they were coated with the DLC film. This is thought to be because the adhesion between the specimen and the polyamide 66 ball were small, due to the stable chemical properties of DLC film.
