Aluminum nitride (AlN) polycrystals were prepared by pulse plasma sintering (PPS) technique. The starting AlN powder mixtures were composed with 3.0 wt%, 5.0 wt% and 10 wt% of yttrium oxide (Y2O3), respectively. Relative density of each polycrystal was measured by hydrostatic method and evaluated higher than 97%. X-ray diffraction (XRD) method was used for phase examination of the samples after heat treatment. Microstructure examination supported by computer-aided analysis was performed by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results were correlated with thermal conductivity of the samples carried out by laser pulse method (LFA). The influence of the rapid sintering technique and yttrium oxide additive content on the thermal conductivity and microstructure appearance of AlN polycrystals was clearly shown.
The research work was carried out within the project “New Construction Materials with High Thermal Conductivity” (No. UDA-POIG.01.01.02-00-97/09-01). Thermal conductivity measurements were performed in collaboration with Faculty Laboratory of Thermophysical Measurements of Materials Science and Ceramics Faculty, AGH University of Science and Technology in Krakow. Materials were obtained in collaboration with Laboratory of Warsaw University of Technology. Thanks to Dr. Lukasz Ciupinski from Faculty of Materials Science and Engineering, Warsaw University of Technology, for sample sintering by PPS process, and to Kamil Jankowski from Faculty of Material Science and Ceramics, AGH University of Science and Technology, for powder mixture preparation.
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