Journal of Materials Science

, Volume 30, Issue 3, pp 607–614 | Cite as

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

Part I The phase equilibria in the B-C-N-O system
  • S. J. Yoon
  • A. Jha


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.


Boron Nitride Partial Pressure Anhydride Phase Equilibrium 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • S. J. Yoon
    • 1
  • A. Jha
    • 1
  1. 1.Department of Materials TechnologyBrunel UniversityUxbridgeUK

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