Tribological Properties of Chemical Vapor Deposited Diamond Film on YT14 Cemented Carbide under Water Lubrication Condition

摘要

A diamond film was deposited on YT14 cemented carbide using chemical vapor deposition technique.The surface and cross-section morphologies and chemical compositions of obtained diamondfilm were analyzed using a scanning electron microscope, energy dispersive spectroscopy,Raman spectroscope, and X–ray diffractometer, respectively. The friction and wear tests of diamondfilm under the water lubrication condition were conducted using a wear tester with theminimum quantity lubrication system, and the effects of wear loads on tribological properties ofdiamond film were also discussed. The results show that the chemical vapor deposited diamondfilm is primarily composed of diamond (111) peak, and its hardness, elastic modulus, bondingstrength, and roughness are 16.27 GPa, 166.18 GPa, 26.2 N, and 79.2 nm, respectively. Underthe water lubrication condition, the average coefficients of friction (COF) of diamond film underthe wear loads of 4, 6, and 8 N are 0.117, 0.139, and 0.163, respectively, and the correspondingwear rates of diamond film under the wear loads of 4, 6, and 8 N are 3.87 × 10~(−7), 4.26× 10~(−7), and4.67 × 10~(−7) mm~3/N • m. This shows that the average COFs and wear rates increase with anincrease of wear loads and that the wear mechanism is abrasive wear.