Effect of Silicon Nitride Seeds Addition on the Particle Size and the Crystal Form of Resulting Powder in Carbothermal Reduction-Nitridation of Silica

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  • KANG In Ho
    Department of Materials Chemistry, Faculty of Engineering, Yokohama National University
  • KOMEYA Katsutoshi
    Department of Materials Chemistry, Faculty of Engineering, Yokohama National University
  • MEGURO Takeshi
    Department of Materials Chemistry, Faculty of Engineering, Yokohama National University
  • NAITO Makio
    Research and Development Laboratory, Japan Fine Ceramics Center
  • HAYAKAWA Osamu
    Research and Development Laboratory, Japan Fine Ceramics Center

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  • 還元窒化法における窒化ケイ素粉末の粒径及び結晶形に及ぼす窒化ケイ素種結晶の影響
  • Effect of Silicon Nitride Seeds Additio

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Abstract

In the carbothermal reduction-nitridation method of producing silicon nitride powder, the effects of addition of silicon nitride seeds on the particle size and α-content in the resulting silicon nitride powder were investigated. The ratio of carbon to silica was determined to be 2.2, which is somewhat higher than the stoichiometric ratio. The ratio was fixed in the subsequent experiments. Adding a small amount of seeds caused a steep increase of α-type in the resulting silicon nitride powder regardless of the types of seeds. However, as the amount of seeds increased, the powder began to reflect the original crystal form. The seed prepared through a pulverizing process yielded fine silicon nitride particles of 0.5 to 0.6μm, equal to the mean diameter of the seed. It is inferred that this was due to the existence of a large numbers of very fine particles in the seed powder. The seed made by the silicon-imide decomposition method produced relatively large particles because of the lack of very fine particles, the size being twice of the mean diameter of the seed. The relation between the numbers of seeds and resultant particle size (D) could be described by the equation D=k(1/N)1/3, where N is the numbers of seeds and k is a constant.

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