The carbothermal reduction of kaolin is a well known method to prepare ß-sialon from inexpensive starting materials. So far however, hardly any attention has been paid to carbothermai production of a-sialons. In this study kaolin, diatomite powder. SiO2, Al2O3. several Ca-sources and carbon black were used. These materials were mixed, slip cast or pressed and heated in nitrogen at 1350 -1450°C. Next the samples were annealed at 1550, 1625 and 1700°C to form a single phase Ca-a-sialon material. In this way up till 90 % purity was reached.
|Title of host publication||Third EURO-Ceramics : vol. 1 : Proceedings of ceramics : Proceedings of the third European Ceramic Society Conference (THIRD ECerS), held on 12-17 September 1993 at the Madrid Congress & Exhibition Centre, Spain|
|Editors||P. Durán, J.F. Fernández|
|Place of Publication||Castellón de la Plana|
|Publisher||Faenza Editrice Iberica|
|Publication status||Published - 1993|