Carbothermal Preparation of Silicon Nitride: Influence of Starting Material and Synthesis Parameters
- 1 March 1992
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 75 (3) , 532-539
- https://doi.org/10.1111/j.1151-2916.1992.tb07838.x
Abstract
C and SiO2 of different types were mixed and heat‐treated (1410° to 1550°C), according to a standardized temperature program, in flowing N2 at different pressures. It was found that a starting material combination of C (115 m2/g) and SiO2 (50 m2/g) yielded pure Si3N4 after about 2 h at 1550°C and 1.3 MPa. By adjustment of the pressure in the range 2 to 6 MPa, irreversible evaporation of SiO(g) as well as formation of nonequilibrium phases was suppressed, and the amounts of residual C and O in the sample were controlled. Even a small amount of CO in the N2 was observed to retard the nitridation. Possible explanations are discussed, based on thermodynamic calculations on the Si‐O‐N‐C system.Keywords
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