Friction-Wear Behaviors of Chemical Vapor Deposited Diamond Films at High Temperatures

Abstract

A diamond film was deposited on YT14 hard alloy cutting tool using a chemical vapor deposition. The coefficients of friction and wear behaviors of the obtained diamond films at 500, 600, and 700°C were investigated using a high temperature tribological tester. The results show that the C of diamond film is fully released at 700°C, generating CO and CO₂. The (220) plane of diamond film is oxidized fully at 500°C, while the (110) plane of diamond film is oxidized at 700°C. The average coefficients of friction of diamond film at 500, 600 and 700°C are 0.55, 0.49, and 0.48, respectively, the wear mechanism is primarily oxidation wear, adhesive wear and abrasive wear, accompanied with fatigue wear.