Abstract
Abstract The reaction sintering and microstructural development of alumina with additions of 1–25 mol% AlN have been investigated by heating under 1-atm nitrogen gas at 1600–1800°C. Sintering Al 2 O 3 with 1 mol% AlN addition at 1750°C, resulted in a ceramic with close to theoretical density of α-Al 2 O 3 (3.98 g/cm 3 ). For the different compositions, the sintered densities decreased with increasing AlN content. This trend was attributed to the presence of secondary phases such as AlON(9Al 2 O 3 ·5AlN) and φ(5Al 2 O 3 ·AlN) formed by reacting Al 2 O 3 with AlN. For a given AlN addition, densification increased with sintering temperature, due to Al 2 O 3 and/or AlON grain growth control. The stability of the individual crystalline phases depends on both sintering temperature and batch composition.
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