Abstract
The coal-tar pitch based carbon fiber reinforced aluminum (CF/Al) composite material is one of the potential candidates of heat dissipation components for its high thermal conductivity (TC). Low pressure infiltration (LPI) method is a useful casting process for fabrication of CF/Al composites with its cost-effectiveness by using extremely low pressure. However, the detrimental product of the reaction between aluminum alloy and CF, such as aluminum carbide (Al 4 C 3 ), is able to affect not only mechanical properties but also TC of CF/Al composites. In the present study, the effect of the growth of Al 4 C 3 during LPI process on TC of unidirectional (UD) CF/Al composites has been characterized. The variation of longitudinal TC was sensitive to growth of Al 4 C 3 during ‘cooling process’ of LPI, whereas the longitudinal TC was not influenced by that during ‘infiltration process’ mostly. The progress of local damages on CF surfaces caused by Al 4 C 3 growth during ‘cooling process’ was a main reason of the decreasing of the longitudinal TC of UD-CF/Al composites.
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