Preparation of Sialon from Solid Wastes by Colloidal Process
Based on the slip casting and the preparation of sialon synthesized from clay, fly ash and gangue by the carbothermal reduction nitridation, the influences of compositions, dispersant additive and sintering process on the properties of materials have been investigated in present work. The experimental results indicate that disposal of fly ash via a pickling process can greatly reduce the content of iron, and the effect is obvious with increasing the concentrations of hydrochloric acid and pickling temperature. Therefore the component of the final product can be purified. It is also noted that the final density of the sintered body using colloidal process is superior to that of using conventional dry pressing, although the slightly higher green density is observed in dry pressing body because of high compaction pressure.
Wei Pan and Jianghong Gong
Y. Yao, L. H. Xu, J. Qiu, "Preparation of Sialon from Solid Wastes by Colloidal Process", Key Engineering Materials, Vols. 336-338, pp. 1927-1929, 2007