Synthesis of Silicon Nitride by a Combustion Reaction under High Nitrogen Pressure

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Fine Si3N4 powders were prepared by the combustion reaction of an Si powder compact undez 10 MPa nitrogen pressure. Addition of Si3N4 powder to the starting Si promoted conversion of the reactants to homogeneous Si3N4 particles. Submicrometer SisN4powders with a uniform size distribution around 0.5 μm were obtained from a 1.8Si‐0.4Si3N4 mixture (molar ratio); they were free of residual Si.