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

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.<p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.18.4.3093">http://dx.doi.org/10.5755/j01.ms.18.4.3093</a></p

Fabrication and Charecterisation of Aluminum-Graphite Composite Material

“…The mould was also pre-heated to avoid shrinkage. Table 2 refelects the effect of adding graphite in aluminium on tensile strength he similar effect of graphite in this alloy has been found by other investigators [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. It is also given that the tensile strength of the composite material is increases as the percentage of "Al 2 O 3 " particle increase in as cast aluminum alloys up to 3.9% "Al 2 O 3 " particles in as the cast conditions.…”

Computational investigation on thermal expansivity behavior of Al 6061–SiC–Gr hybrid metal matrix composites

“…It has been inferred in the experimentation that the reinforcement of Gr with Al-Si and SiC does not enhance the thermal expansivity, thermal conductivity and thermal diffusivity significantly [Okumus et al, 2012]. It has been examined that addition of SiC and Gr reinforcements with high volume fraction results in higher values of thermal capacity, thermal expansivity and thermal conductivity [Okumus et al, 2012;Arockiaswamy et al, 2010;Zhao et al, 2007].…”

“…The CTE of the hybrid composites are lower than the conventional Al-SiC composites with the same volume fraction of SiC. The thermal expansion behavior of the hybrid composites depends on the intrinsic thermal expansion properties of SiC and double interpenetrating structure [Okumus et al, 2012;Arockiaswamy et al, 2010;Zhao et al, 2007].…”

“…This helps to understand the distribution of reinforcements namely SiC and Gr with the matrix alloy Al 6061. It has been accounted in the literature that the evaluation of the distribution of reinforcements and porosity is favorable to carry out thermal analysis and characterization of composites [Okumus et al, 2012]. Figures 1-5 show the micrographs of the different compositions of the hybrid MMCs.…”

“…It has been accounted that the evaluation of the distribution of reinforcements and porosity has been favorable to carry out thermal analysis and characterization of composites. Also, it has been investigated that porosity has severely deteriorated the thermal and mechanical properties of MMCs [Okumus et al, 2012]. It has been stated that due to the increase in volume fraction of the reinforcements, the distribution is more reliable with negligible porosity [Naveen and Ramesh, 2014].…”