Abstract
We have theoretically studied and quantitatively analysed the enhancement of thethermal conductivity of AlN microceramics (i.e. commercially available powder)by the insertion of AlN nanosized particles of high-specific surface area, and ofY2O3 and CaO as sintering additives. We have also studied the enhancementof the thermal conductivity of AlN nanoceramics by usingY2O3 as the sintering additive. Thermal conductivity calculations have been carried out byapplying the Callaway theory in its full form and by incorporating a detailed and accurateaccount of three-phonon processes. The role of densification of the AlN ceramic samples inenhancing the thermal conductivity has been quantified at low, intermediate and hightemperatures. In addition to explaining the experimentally observed room-temperatureconductivity results, the conductivity variation has been predicted over a large temperaturerange.
Published Version
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