Synthesis of nitrogen ceramic povvders by carbothermal reduction and nitridation Part 1 Silicon nitride
- 1 April 1991
- journal article
- research article
- Published by SAGE Publications in Materials Science and Technology
- Vol. 7 (4) , 289-298
- https://doi.org/10.1179/026708391790183321
Abstract
Silicon nitride powders of high α content were prepared from mixtures of very fine amorphous silica and carbon powders in flowing nitrogen at 1400–1500°C. The higher the reaction temperature within this range the lower the yield of silicon nitride in spite of a higher rate of SiO generation. The overall reaction rate increased with increasing nitrogen flowrate. An increase of carbon content of the starting mixtures increased the reaction rate by increasing the rate of SiO formation as well as the rate of Si3N4 nucleation. It is thought that the effect of the carbon particle size on the reaction rate is more significant than that of the specific surface area. The amount of silicon carbide formed and the α/β ratio in the reaction products were strongly affected by a change of the source of carbon used in the starting mixtures. MST/1346aKeywords
This publication has 8 references indexed in Scilit:
- Stability of Phases in the Si‐C‐N‐O SystemJournal of the American Ceramic Society, 1988
- Preparation of Si3N4and AlN Powders from Alkoxide-Derived Oxides by Carbothermal Reduction and NitridationAdvanced Ceramic Materials, 1987
- Conversion of precipitated silica from geothermal water to silicon nitrideJournal of Materials Science, 1987
- The influence of iron on the preparation of silicon nitride from silicaJournal of Materials Science, 1985
- Growth of beta-silicon carbide whiskers by the VLS processJournal of Materials Science, 1985
- Preparation of Silicon Nitride from SilicaJournal of the American Ceramic Society, 1984
- Reaction-bonded silicon nitride: its formation and propertiesJournal of Materials Science, 1979
- Synthesis of the ? form of silicon nitride from silicaJournal of Materials Science, 1975