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Influence of powder characteristics on gas pressure sintering of Si3N4

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Abstract

The sintering behaviours of four kinds of Si3N4 powders were investigated by dilatometry in 10 atm N2 at 1890, 1930 and 2050° C. The sinterabilities of powders were compared and discussed in relation to the powder characteristics. A large size distribution in the powder accelerated grain and pore growth at <1800° C, which resulted in the inhibition of further densification at >1800° C. The presence of carbon in a powder prevented densification. A powder with a uniform grain size kept the microstructure of the sintered material uniform during sintering at <1800° C and gave a high degree of shrinkage at >1800° C. Densification at >1800° C was accompanied by the dissolution of equi-axial β-Si3N4 grains and reprecipitation as elongated β-Si3N4 grains from the oxynitride liquid. The relation between the densification and microstructure is discussed in terms of the relative rates of densification and grain growth.

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Author notes

  1. N. Yang

    Present address: Materials Research Laboratory, Industrial Technology Research Institute, 195-5 Chung-hsing Rd, 31015, Chutung, Hsinchu, Taiwan

  2. Y. Kishi

    Present address: Central Research Laboratory, Nihon Cement Co., 1-2-3 Kiyosumi, Kohtoh-ku, Tokyo, Japan

Authors and Affiliations

  1. National Institute for Research in Inorganic Materials, Namiki 1-1, Sakura-mura, Niihari-gun, Ibaraki, Japan

    M. Mitomo, N. Yang, Y. Kishi & Y. Bando

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  1. M. Mitomo
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  2. N. Yang
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  3. Y. Kishi
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  4. Y. Bando
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Mitomo, M., Yang, N., Kishi, Y. et al. Influence of powder characteristics on gas pressure sintering of Si3N4 . J Mater Sci 23, 3413–3419 (1988). https://doi.org/10.1007/BF00551328

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  • DOI: https://doi.org/10.1007/BF00551328

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