INFLUENCING FACTORS OF THE PREPARATION OF β-SIALON POWDERS BY KAOLIN

Sample ofβ-sialon powders with certain mass fraction were synthesized by the carbothermal method through nitridation at 1450℃in a tubular furnace utilizing refined kaolin and kaolin rough ore from Guangxi Weiluo as raw materials.The nitridation proc- ess and phase state of the product were analyzed.The results show thatβ-sialon powders with certain mass fraction can be prepared using refined kaolin and kaolin rough ore as raw materials.The content of aluminosilicate impurity in the product prepared using different raw materials is obviously different.The aluminosilicate can he restrained via appropriate addition of Fe_2O_3.Using refined kaolin as raw materials,when the average flow of N_2 is 112.5 L/min,the content of synthesizedβ-sialon is highest,and the mass ratio of aluminosilicate and mullite andβ-sialon is 1:0.5:1.5.