Synthesis of Sialon-Mullite Composites Using Fly Ash by Carbon-thermal Reduction Nitridation

摘要

Sialon-mullite composites were synthesized from fly ash with high alumina and coke powders in flowing nitrogen atmosphere at 1580℃ for 2h. Effects of different carbon sources and burying powders on phase composition of the production were studied. The results indicated coke was more suitable as carbon source, silicon powders was more suitable as burying powders, respectively. The principal phases of the samples sintered with coal fines as carbon source was mullite and the second phase was corundum.