Abstract
The effect of reduction of the AlYO containing secondary phases forming AlN and YN during sintering of AlN(YF 3) embedded in AlN powder has systematically been studied. The sintering was performed in a graphite furnace at 1880 °C. With increased reduction of the secondary phase, the following effects were observed: (a) the chemical composition of the secondary phase changed in the order YAG → YAP → YAM → Y 2O 3 → YN; (b) reduction of the amount or removal of the secondary phase; (c) decreased sinterability of AlN when more than 5 wt% YF 3 was added; (d) reduction in the lattice oxygen content; and (e) increased thermal conductivity. Included in the paper is a discussion of a possible mechanism for the reduction of the secondary phase, which we propose is controlled by the diffusion of gas species (CO/CO 2 and/or Al 2O) through the powder bed and the distance between the AlN samples and a graphite source, as well as a proposed optimal sintering programme for AlN with AlYO containing phases.
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