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Development of Si-DLC Coated Tappet for Improved Wear Resistance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
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Most bucket type valvetrain engines use DLC coated tappet for low friction and fuel efficiency. However the requirements on coating robustness have been increased as the tribological environments have become more severe by use of low viscosity oil or higher engine output. In order to obtain higher coating efficiency and improved wear resistance, 5∼9 at.% Si doped DLC (Si-DLC) coated tappet has been developed using PACVD process. Thermal stability and wear resistance of Si-DLC were improved impressively than those of DLC, although mechanical properties such as hardness and adhesion were degradated. It seems that Si suppresses a graphitization of DLC and thin SixOy film on coating surface acts as a barrier to oxidation or flash heat.
CitationAhn, J. and Choi, S., "Development of Si-DLC Coated Tappet for Improved Wear Resistance," SAE Technical Paper 2015-01-0685, 2015, https://doi.org/10.4271/2015-01-0685.
- Hauert R., “An Overview on the Tribological Behavior of Diamond-like Carbon in Technical and Medical Applications,” Tribology Int. 37(11):991-1003, 2004, doi:10.1016/j.triboint.2004.07.017.
- Mabuchi, Y., Hamada, T., Izumi, H., Yasuda, Y. et al., “The Development of Hydrogen-free DLC-coated Valve-lifter,” SAE Technical Paper 2007-01-1752, 2007, doi:10.4271/2007-01-1752.
- Mori, H., Takahashi, N., Kazuyuki, N., Tachikawa, H. et al., “Low Friction Property and its Mechanism of DLC-Si Films Under Dry Sliding Conditions,” SAE Technical Paper 2007-01-1015, 2007, doi:10.4271/2007-01-1015.
- Tallant D. R., Parmeter J. E., Siegal M. P., and Simpson R. L., “The Thermal Stability of Diamond-like Carbon,” Diamond and Related Materials 4(3):191-199, 1995, doi:10.1016/0925-9635(94)00243-6.
- Tung Simon C., and Gao Hong, “Tribological Characteristics and Surface Interaction between Piston ring Coatings and a Blend of Energy-Conserving Oils and Ethanol Fuels,” Wear 255(7):1276-1285, 2003, doi:10.1016/S0043-1648(03)00240-0.
- Shinyoshi, T., Fuwa, Y., and Ozaki, Y., “Wear Analysis of DLC Coating in Oil Containing Mo-DTC,” SAE Technical Paper 2007-01-1969, 2007, doi:10.4271/2007-01-1969.
- Bewilouga K., and Dimigen H., “Preparation of W-C:H coatings by Reactive Magnetron Sputtering,” Surface and Coatings Tech. 61(1):144-150, 1993, doi:10.1016/0257-8972(93)90217-C.
- Grill A., “Tribology of Diamond like Carbon and Related Materials : and updated review,” Surface and Coatings Tech. 94:507-513, 1997, doi:10.1016/S0257-8972(97)00458-1.
- Robertson J., “Properties of Diamon-like Carbon,” Surface and Coatings Tech. 50(3):185-203, 1992, doi:10.1016/0257-8972(92)90001-Q.
- Robertson J., “Diamond-like Carbon,” Materials Science and Engineering : R: Reports 37(4):129-281, 2002, doi:10.1016/S0927-796X(02)00005-0.
- Varma A., Palshin V., and Meletis E. I., “Structure-Property relationship of Si-DLC films,” Surface and Coatings Tech. 148(2):305-314, 2001, doi:10.1016/S0257-8972(01)01350-0.
- Baba K., Hatada R., Flede S., and Ensinger W., “Deposition of Silicon-Containing Diamond-like Carbon films by Plasama-Enhanced Chemical Vapour Deposition,” Surface and Coatings Tech. 203(17):2747-2750, 2009, doi:10.1016/j.surfcoat.2009.02.117.
- Rabbani F., “Phenomenological Evidence for the Wear-induced Graphitization Model of Amorphous Hydrogeneted Carbon Coatings,” Surface and Coatings Tech. 184(2):194-207, 2004, doi:10.1016/j.surfcoat.2003.11.006.