Thermal conductivity of Al–SiC composites with monomodal and bimodal particle size distribution

✍ Scribed by J.M. Molina; J. Narciso; L. Weber; A. Mortensen; E. Louis

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 592 KB
• Volume: 480
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2007.07.026

✦ Synopsis

The thermal conductivity of aluminum matrix composites having a high volume fraction of SiC particles is investigated by comparing data for composites fabricated by infiltrating liquid aluminum into preforms made either from a single particle size, or by mixing and packing SiC particles of two largely different average sizes (170 and 16 m). For composites based on powders with a monomodal size distribution, the thermal conductivity increases steadily from 151 W/m K for particles of average diameter 8 m to 216 W/m K for 170 m particles. For the bimodal particle mixtures the thermal conductivity increases with increasing volume fraction of coarse particles and reaches a roughly constant value of 220 W/m K for mixtures with 40 or more vol.% of coarse particles. It is shown that all present data can be accounted for by the differential effective medium (DEM) scheme taking into account a finite interfacial thermal resistance.