Abstract
The sintered aluminum nitride granules were prepared in a continuous process through a two-step heat treatment at 1600 °C for 5 h and 1850 °C for 5 h using the spherical γ-alumina/phenol-resin precursor obtained by spray granulation as the starting material. In the first step of heat treatment, the alumina powders were nitrided to form porous aluminum nitride granules via a carbothermal reduction reaction and then were continuously heated in the second step of heat treatment to produce dense spherical aluminum nitride granules without using sintering aids. The obtained porous and sintered aluminum nitride granules were characterized by XRD, SEM and BET measurements and exhibited an average grain size of about 1 and 3 µm, respectively. Furthermore, the specific surface area of the obtained porous and sintered aluminum nitride granules dramatically decreased from 2.49 to 0.16 m2/g showing that the low-porosity, dense, polycrystalline aluminum nitride granules were successfully prepared.
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