Tribological peformance of a 3-D carbon-carbon composite; Part 1: Ambient environment
- Martin Marietta Astronautics Group, Denver, CO (United States)
The tribological performance of a three-dimensional (3-D) carbon-carbon composite in room temperature air was established using a reciprocating pin-on-flat test technique. Test load, sliding orientation with respect to the Z fiber two axis, and the effect of conforming-area-contact were studied to evaluate their effects on coefficients of friction and wear rates. Applied load had a pronounced effect with lower coefficients of friction and wear rates for the higher test loads. Coefficient of friction closely followed solid lubrication theory. Sliding orientation influenced coefficient of friction only at the lowest test loads with more beneficial results for a sliding orientation parallel to the flat Z fiber-tow-axis. Conforming geometry resulted in higher coefficients of friction than point contact, presumably due to larger contact areas and thus lower stress levels. The wear mechanism appears to be polishing wear of the sliding pin with material transfer to the stationary flat, resulting in material coverage across fiber tows. 9 refs., 7 figs., 1 tab.
- OSTI ID:
- 273540
- Journal Information:
- Lubrication Engineering, Journal Name: Lubrication Engineering Journal Issue: 7 Vol. 51; ISSN LUENAG; ISSN 0024-7154
- Country of Publication:
- United States
- Language:
- English
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