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Vapour transport of magnesia into reaction-bonded silicon nitride

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Abstract

Magnesia, as a sintering additive, can be introduced into reaction-bonded silicon nitride (RBSN) via vapours-phase transport. The principal process variables were studied; a controlling factor was found to be the amount of silica on the internal surfaces of the ceramic. Through a controlled oxidation of the RBSN, the amount of magnesia introduced to the compact was increased to ≈2 wt% allowing a post-sintered density of 93% theoretical to be achieved. Further increases in internal oxidation, and consequent magnesia uptake, were limited by the oxidation of Si3N4 whiskers on the surface of the RBSN and in its pore structure.

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  1. M. D. Pugh

    Present address: Department of Mechanical Engineering, University of Canterbury, New Zealand

Authors and Affiliations

  1. School of Materials, University of Leeds, UK

    M. D. Pugh & A. J. Moulson

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  1. M. D. Pugh
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  2. A. J. Moulson
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Pugh, M.D., Moulson, A.J. Vapour transport of magnesia into reaction-bonded silicon nitride. Journal of Materials Science 30, 1425–1428 (1995). https://doi.org/10.1007/BF00375242

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  • DOI: https://doi.org/10.1007/BF00375242

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