The Effect of Diluent on Combustion Synthesis of Si3N4-SiC-TiN Ceramics with Small Diameter
Si3N4-TiN-SiC multiphase ceramics was synthesized from TiSi2 and SiC powders by combustion synthesis. The effect of dilute content on conversion percentage was calculated in theory assuming that there is no penetration of nitrogen gas, and combustion synthesis was carried under different conditions. The results show that the increase of diluent content in certain extent is helpful for nitrification of TiSi2 and free silicon were detected in the 30wt% and 40wt% SiC-diluted samples with 45vol% porosity while no silicon were found in 50vol% porosity green parts. The increase in diluent content and porosity of the compacts are favorable for the development of rod-like β-Si3N4 and the long-diameter ratio of β-Si3N4 is increase as the increase of these two values.
Wei Pan and Jianghong Gong
X. J. Zhang, Y. T. Zheng, J. C. Han, "The Effect of Diluent on Combustion Synthesis of Si3N4-SiC-TiN Ceramics with Small Diameter", Key Engineering Materials, Vols. 336-338, pp. 1084-1086, 2007