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Vapour-phase reduction and the synthesis of boron-based ceramic phases

Part I The phase equilibria in the B-C-N-O system

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Abstract

Thermodynamic calculations have been performed to establish the partial pressure relationships between the gaseous species BO and CO at an isotherm during the reduction-nitridation of boric anhydride. This relationship enables us to establish the condition for the formation of boron nitride ceramic phase by selecting a suitable nitriding atmosphere. Relevant Gibbs free-energy equations have also been considered for establishing the phase equilibrium relationships over a wide range of temperature in the B-C-N-O system. The importance of BO gas formation and its subsequent reduction to BN is also discussed.

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Author notes

  1. S. J. Yoon

    Present address: Research Laboratories, POSCO (Pohang Iron and Steel Co. Ltd.), Korea

Authors and Affiliations

  1. Department of Materials Technology, Brunel University, Kingston Lane, UB8 3PH, Uxbridge, Middlesex, UK

    S. J. Yoon & A. Jha

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  1. S. J. Yoon
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  2. A. Jha
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Yoon, S.J., Jha, A. Vapour-phase reduction and the synthesis of boron-based ceramic phases. JOURNAL OF MATERIALS SCIENCE 30, 607–614 (1995). https://doi.org/10.1007/BF00356318

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  • DOI: https://doi.org/10.1007/BF00356318

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