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| Microstructure and Tribological Property of C-TaC Coatings on Graphite Prepared by Chemical Vapor Deposition |
| Dongze LV,Zhaoke CHEN,Xiang XIONG,Yalei WANG,Wei SUN,Zehao LI |
| State Key Laboratory of Powder &Metallurgy, Central South University, Changsha 410083, China |
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Cite this article:
Dongze LV,Zhaoke CHEN,Xiang XIONG,Yalei WANG,Wei SUN,Zehao LI. Microstructure and Tribological Property of C-TaC Coatings on Graphite Prepared by Chemical Vapor Deposition. Chinese Journal of Materials Research, 2016, 30(9): 690-696.
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Abstract C-TaC coatings with different C contents (in mass fraction) were deposited on pure graphite by chemical vapor deposition technique with a gas mixture of TaCl5-Ar-C3H6. The tribological properties of the as-prepared coatings were characterized by multifunctional tribometer. The microstructures of the coatings and then the morphologies of the friction surface were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that the addition of an appropriate amount of Ta to a pure carbon coating can increase the content of sp2 bonds in the carbon coatings, and can improve the degree of graphitization of the carbon based coatings. When the mass fraction of C in the coatings was 86.4%, the coating show a nano composite structure with the pyrolytic carbon matrix embedded with nanometersized TaC crystallites and among others, which shows the smallest friction coefficient of 0.13. The wear mechanism may mainly concern with adhesive wear, fatigue wear and abrasive wear. By controlling the carbon content and the size of the crystallites in the coating, the friction coefficient of the coating can be adjusted effectively.
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Received: 02 December 2015
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| Fund: *Supported by National Basic Research Program of China No 2011CB605805, Science and Technology Projects of Hunan Province No2015WK3013, and State Key Laboratory of Powder Metallurgy at Central South University |
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