Abstract
Sintered aluminium nitride is a good thermal conductor which is one of the principal properties of this ceramic. Previous studies have shown that the thermal flux transfer depends strongly on the oxygen contained in the crystal lattice, and on the powder surface. An AlN ceramic containing YF 3 as additive has been fabricated by tape-casting and sintering. This study shows that binder burnout must be carried out in air at 550 °C or in nitrogen at 650 °C. Sublimation of YF 3 to YOF, and formation of yttrium aluminate occurred during calcination. The amount of YF 3 present, thermal treatment duration and the rate of temperature increase and decrease affected oxygen diffusion in the nitride lattice. However, there is no correlation between thermal conductivity and oxygen content and microstructural characteristics are more influential than total oxygen content up to a thermal conductivity value of 220 W/m K.
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