MICROSTRUCTURE AND THERMAL CONDUCTION PROPERTIES OF A1203-Ag COMPOSITES

摘要

Microstructure and thermal conduction properties involving thermal diffusivity and conduc- tivity of composite, Al_2 O_3-Ag, were investigated. The Ag particles observed in the composites were spread sporadically throughout the composite with inclusion size increasing with Ag content, rather than forming a network of thin film foil. Thermal conductivity of the composite increased with Ag content and followed composite theory prediction with a negligible influence of interfacial contact resistance. The temperature dependence of the thermal conductivity became less pronounced with increasing Ag content reflecting the nature of electron contribution in Ag rather than the typical phonon contribution in polycrystalline Al_2 0_3.