Experimental Investigations on Thermal Analysis and Thermal Characterization of Al 6061-Sic-Gr Hybrid Metal Matrix Composites

Abstract

Metal matrix composites are regarded to be one of the most predominant classifications in composite materials. The thermal characterization of hybrid metal matrix composites has been increasingly important in a wide range of applications. The coefficient of thermal expansion, thermal conductivity, thermal diffusivity and specific heat capacity are the most important properties of Metal Matrix Composites (MMCs). Since nearly all Metal Matrix Composites are used in various temperature ranges, measurement of thermal properties of MMCs as a function of temperature is necessary in order to know the behaviour of the material. In this research paper, the evaluation of thermal conductivity, thermal diffusivity, thermal expansivity and thermal capacity has been accomplished for Al 6061, Silicon Carbide and Graphite hybrid metal matrix composites from room temperature to 300°C. Aluminium based composites reinforced with Silicon Carbide and Graphite particles have been prepared by stir casting technique. The thermal behaviour of hybrid composites with different percentage compositions of reinforcements has been investigated. The results have indicated that the thermal properties of the different compositions of hybrid MMCs vary by the addition of Graphite with Silicon Carbide and Al 6061. Few empirical models have been validated for the evaluation of thermal expansivity and thermal conductivity of hybrid composites.