Abstract
Monodisperse, spherical Si3N4 powder composed of fine particulates was synthesized by pyrolyzing spherical organo‐silica powder under nitrogen. The organo‐silica powder was prepared by hydrolyzing a mixture of phenyltrimethoxysilane (PTMS) and tetraethoxysilane (TEOS) in a methanol solution of water and ammonia. The organo‐silica powder consisted of 81.3 at.% silicon units derived from PTMS and 18.7 at.% silicon units derived from TEOS. During the pyrolysis under nitrogen, the organo‐silica powder decomposed to a mixture of free carbon and silica, with an increase of the surface area, at 500°‐600°C, followed by the formation of alpha‐Si3N4, with ß‐Si3N4 as a minor phase, at 1450° and 1500°C and ß‐SiC at 1550°C. The pyrolyzed powders, which retained the spherical shape and monodispersity of the organo‐silica powders, with a reduction in mean particle diameter, were composed of fine particulates that were ~40 nm in size.
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