Thermodynamics of the Al-C-N-O system for the production of aluminum nitride

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:567927

Liu, Siang-Chun ^[1]

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1. National Taipei Institute of Technology, Taipei (Taiwan, Province of China)

The phase stability for the Al-C-N-O system have been calculated and analyzed based on available thermodynamic data. In the Al-C-N system, aluminum nitride can be easily produced by infusing nitrogen gas through aluminum carbide at lower temperature. Meanwhile carbide is fabricated by carbothermic reduction from alumina in a temperature higher than 2267 K. In the Al-C-O system, the alumina could be reduced into aluminum metal by aluminum carbide at 2365 K. In the Al-N-O system, aluminum nitride might be obtained from the nitridation of alumina by directly introducing the ultra pure nitrogen gas in which the oxygen pressure has to be less than log pO{sub 2} = -35,231 / T + 3,244. Finally, in the Al-C-N-O system, the optimum condition for carbothermic reduction and simultaneous nitridation of alumina and the aluminum nitride could be successfully achieved at 1961 K.

• OSTI ID: 567927
• Report Number(s): CONF-9604124--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
MANUFACTURING
NITRIDATION
PHASE STABILITY