Formation of Solid Solution (Al2OC)1-x(AlN)x and Its Application in Spinel-Carbon Clinker Preparation.

Abstract

Among solid solutions (Al2OC)1-x(AlN)x, x=0-1, it has been found that (Al2OC)0.5 (AlN)0.5, x=0.5, is easier to form by a solid state reaction. In this regard, a homogeneous solid solution (Al2OC)0.5(AlN)0.5 was obtained through heating of a compact, including Al2O3, Al, AlN and graphite, at 1700°C for 5h in Ar atmosphere and rapid cooling down to 1400°C. In comparing with AlN, it showed better hydration resistance. The obtained solid solution starts to react with MgO at 1100°C in CO atmosphere to form spinel and carbon. Therefore, the spinel-carbon clinker was prepared through heating of MgO-(Al2OC)0.5(AlN)0.5 compact in CO gas at 1500°C for 5h. The precipitated carbon in the obtained clinker was amorphous and finely distributed among the spinel phase.