Letter | Published:

SiC and Si3N4 sintered bodies with new borodiphenylsiloxane polymers as binder

Naturevolume 266pages522524 (1977) | Download Citation

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Abstract

HIGH-STRENGTH SiC and Si3N4 sintered bodies have been studied for their application as high-temperature structural materials1. A high-strength SiC sintered body using an organometallic polymer as the binder has been reported2. A feature of this method is that polycarbosilane (PC) as the binder is converted into fine-particle inorganic β-SiC by heat-treatment, which fills the grain boundaries of the matrix SiC. In this way, with a hard-to-sinter material such as SiC or Si3N4, a sintered body with excellent mechanical strength can be produced at relatively low temperature without using a hot press. We recently synthesised a particular form of polyborodiphenylsiloxane (PB)p, an organometallic polymer, which is very effective as a binder. Using this binder, SiC and Si3N4 sintered bodies of high mechanical strengths could be successfully obtained. These results are outlined here.

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References

  1. 1

    Edington, J. W., Rowcliffe, D. J. & Henshall, J. L. Powder Meta. Int. 7, 82 (1975).

  2. 2

    Yajima, S. et al. Nature, 264, 238 (1976).

  3. 3

    Yajima, S., Hayashi, J. & Okamura, K. Nature 266, 521–522 (1977).

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Affiliations

  1. The Oarai Branch, The Research Institute for Iron, Steel and Other Metals, Tohoku University, Oarai, Ibaraki-ken, 311-13, Japan

    • SEISHI YAJIMA
    • , TOETSU SHISHIDO
    •  & MASAAKI HAMANO

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https://doi.org/10.1038/266522a0

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