Influence of high temperature heat treatment on the friction properties of carbon/carbon composites under wet conditions
β Scribed by Yidong Yuan; Ruiying Luo; Fukuan Zhang; Jinsong Li; Tao Liu; Wancheng Zhou
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 306 KB
- Volume
- 402
- Category
- Article
- ISSN
- 0921-5093
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Carbon-carbon composites have been prepared with and without addition of 15 wt% of the glass-forming oxidation inhibitors boron and zirconium diboride. Samples of the composites carbonised at 850Β°C were further heat treated over a range of heat-treatment temperatures to 2650Β°C. Mechanical properties
Abstracts torsion testing under cyclic loading to lo6 cycles. It was learned that carbon-carbon creeps or takes on a permanent deformation, but is resistant to fatigue loading and in general can retain its stiffness and strength up to lo6 cycles. Fiber bundle slipping and re-sticking is believed to
kz and permit determination of the activation energy (22 kcal) for step 2. Together with the activation energy (52 kcal) for step 1, one obtains 32 kcal as the heat of dissociation of the C-C bond in CsOz at 1000Β°K. This figure, which at first seems surprisingly low, leads to a reasonable value (f51