Thermal Expansion and Thermal Conductivity Behaviors of Al-Si/SiC/graphite Hybrid Metal Matrix Composites (MMCs)

S. Cem OKUMUS, Serdar ASLAN, Ramazan KARSLIOGLU, Deniz GULTEKIN, Hatem AKBULUT

Abstract


Aluminum-silicon based hybrid composites reinforced with silicon carbide and graphite particles were prepared by liquid phase particle mixing (melt stirring) and squeeze casting. The thermal expansion and thermal conductivity behaviors of hybrid composites with various graphite contents (5.0; 7.5; 10 wt.%) and different silicon carbide particle sizes (45 µm and 53 µm) were investigated. Results indicated that increasing the graphite content improved the dimensional stability, and there was no obvious variation between the thermal expansion behaviors of the 45 µm and the 53 µm silicon carbide reinforced composites. The thermal conductivity of hybrid composites was reduced due to the enrichment of the graphite component.

DOI: http://dx.doi.org/10.5755/j01.ms.18.4.3093


Keywords


hybrid MMC; thermal expansion; thermal conductivity

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Print ISSN: 1392–1320
Online ISSN: 2029–7289