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In this work, we report temperature-dependent thermal properties of alumina   powder and bulk alumina consolidated by spark plasma sintering method. The   properties were measured between room temperature and 250ºC using a thermal   constants analyzer. Alumina powder had very low thermal properties due to the   presence of large pores and absence of bonding between its particles. Fully   dense alumina with a relative density of 99.6 % was obtained at a sintering   temperature of 1400°C and a holding time of 10 min. Thermal properties were   found to mainly dependent on density. Thermal conductivity, thermal   diffusivity, and specific heat of the fully dense alumina were 34.44 W/mK,   7.62 mm2s-1, and 1.22 J/gK, respectively, at room temperature. Thermal   conductivity and thermal diffusivity decreased while specific heat increased   with the increase in temperature from room temperature to 250ºC

Temperature-dependent thermal properties of spark plasma sintered alumina