Wear behaviour of hydrogen free diamond-like carbon thin films in diesel fuel at different temperatures |
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| Affiliation: | 1. University of Applied Sciences Schmalkalden, Germany;2. University of Applied Sciences Mittweida, Germany;3. Technische Universität Bergakademie Freiberg, Germany;1. School of Materials Science and Engineering, South China University of Technology, 381 Wushan, Guangzhou 510640, China;2. School of Mechanical & Antivehicle Engineering, South China University of Technology, 381 Wushan, Guangzhou 510640, China;3. Smart Machinery & Surface Technology Division, Hongkong Promotion Center, 78 Tat Chee Avenue, Hong Kong, China |
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| Abstract: | In the present study, super hard, hydrogen free amorphous diamond-like carbons with a high fraction of sp3 hybridised carbon were deposited by pulsed laser deposition. The tribological performance of DLC coatings was investigated by translatory oscillating relative motion of a 100Cr6 steel ball in diesel fuel or ambient air at 25 °C or 150 °C temperature. The structure of the coatings and the tribological worn surfaces were characterised by Raman spectroscopy and by scanning electron microscopy. Bio-fuel with a high fraction of unsaturated fatty acids has the potential to reduce friction in tribological systems with chemically inert DLC. Diesel blend with 10% bio-fuel reduces friction at 150 °C. If there is no diesel fuel, pre-oxidation at 450 °C for 8 h leads to the best wear resistance (↓ f & wear rate) at room temperature. Without diesel fuel, enhancement of temperature up to 150 °C during wear testing causes an increase of the coefficient of friction. Again the 450 °C pre-oxidised sample revealed the lowest friction. For this coating, Raman spectroscopy points to a small increase of the sp2 C C bonds. Diesel fuel seems to promote coherent coating failure under 150 °C wear, while pre-oxidation at 450 °C support adhesive coating ablation under higher loads or cyclic loading. |
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