Ceramics-Silikáty 52, (1) 37 - 44 (2008) |
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TRIBOLOGICAL PROPERTIES OF CARBON-CARBON COMPOSITE AND OF A SURFACE LAYER OF PYROLYTIC CARBON |
Tolde Zdeněk, Starý Vladimír, Kubart Tomáš |
Czech Technical University in Prague, Faculty of Mechanical Engineering,
Karlovo nám. 13, 121 35 Prague 2, Czech Republic
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Keywords: Carbon-carbon composites, Pyrolitic carbon, Tribological properties, Microhardness |
The coefficient of friction and wear resistance of 2D carbon–carbon composite and of a surface layer of pyrolytic carbon were
determined. To explain these results, we also measured the surface roughness and microhardness of both the composite and
the layer. This material system is often used in biomedical applications (bone and joint implants), machinery sliding parts of
bearings and in the aircraft industry (parts of the braking system). We studied the samples both with native ("as prepared")
surfaces and also with surfaces prepared by grinding and polishing, to obtain samples with various roughness. The lowest
friction coefficient was found for polished composite surface. On the other hand, the cover of pyrolitic carbon on composite
improved the wear resistance. The measurements demonstrate good tribological properties of the surfaces suitable for many
applications. |
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