Friction of Pyrolytic Carbon Coating Prepared by Gradient CVD on Medical Carbon/Carbon Composites Surface

doi:10.3724/SP.J.1077.2012.00545

Abstract

Abstract:

Pyrolytic carbon coating was prepared by gradient chemical vapor deposition (CVD) on medical carbon/carbon composites surface. Microstructure, friction coefficient and wear capacity of the pyrolytic carbon cating were investigated. The results show that the pyrolytic carbon coating is covered densely by spherical pyrdytic carbon with dimension of about 20 μm, and close, multi-layer pyrolytic carbon is shown on the fracture. Compared with carbon/carbon composite prepared by asphalt impregnated/carbonization, the friction coefficient of the byrolytic carbon coating is higher in the dry friction whereas in wet friction of simulated human joints, its friction coefficient is lower. The wear loss of the pyrolytic carbon coating is much smaller than that of the latter in dry and wet friction. It suggests that medical carbon/carbon composites surface prepared by gradient CVD can improve the wear resistance of the carbon/carbon composites.

Key words: carbon/carbon composites, CND, gradient, friction

CLC Number:

TB332

NI Xin-Ye, TANG Xiao-Bin, LIN Tao, GENG Chang-Ran, CAI Lei-Ming, GU Wei-Dong, CHEN Da. Friction of Pyrolytic Carbon Coating Prepared by Gradient CVD on Medical Carbon/Carbon Composites Surface[J]. Journal of Inorganic Materials, 2012, 27(5): 545-549.

Figures/Tables 6

Fig. 1 Surface and fracture SEM images of carbon/carbon composites

Fig. 2 XRD patterns of carbon/carbon composites surface

Fig. 3 Real dry friction coefficients of carbon/carbon composites surface

Fig. 4 Real wet friction coefficients of carbon/carbon composites surface

Fig. 5 Surface wear morphologies of dry friction

Fig. 6 Surface wear morphologies of wet friction

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