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Journal of Materials Science

, Volume 28, Issue 12, pp 3125–3131 | Cite as

Carbothermal synthesis of aluminium nitride at elevated nitrogen pressures

Part I Effect of process parameters on conversion rate
  • B. Forslund
  • J. Zheng
Papers

Abstract

This paper is the first part of an investigation of carbothermal nitridation of alumina at elevated nitrogen pressure. The effect of some process parameters on nitridation rate was studied at different temperatures (1300–1700 °C) and pressures (0.1–5 MPa). The experiments were performed in a graphite furnace permitting a controlled nitrogen flow through the sample holder, and continuous measurement of CO in the outlet gas. The products were characterized by X-ray diffraction, BET and elemental analyses. The nitridation rate was found to be a function of the process parameters. For a suitable temperature and pressure, e.g. 1600 °C and 1 MPa, pure AIN was obtained after just 1 h, with very low residual oxygen content (0.4 wt%). At a high gas-flow rate (⩾5 I min−1), the optimum range of pressure was 0.5–1 MPa at 1550–1700 °C. The nitridation was hampered by even small amounts of CO added to the system. No intermediate phases formed under the experimental conditions studied. Thermodynamic calculations on the Al-O-C-N system were performed in a search for explanations of the results.

Keywords

Nitride Nitrogen Flow Thermodynamic Calculation Intermediate Phase Graphite Furnace 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • B. Forslund
    • 1
  • J. Zheng
    • 1
  1. 1.Department of Inorganic Chemistry, Arrhenius LaboratoryStockholm UniversityStockholmSweden

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