Kinetics of microwave synthesis of AlN by carbothermal-reduction-nitridation at low temperature

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Abstract

Aluminum nitride (AlN) was synthesized at 1000-1400°C from a mixture of alumina and carbon powders using 2.45 GHz microwaves in a N2 atmosphere. High nitridation ratios (>0.90) were obtained in the temperature range 1200-1400°C. The apparent activation energy of the carbothermal reduction and nitridation (CRN) reaction using 2.45 GHz microwave irradiation was calculated from the nitridation ratio. The value obtained, 79.9 kJ/mol, is 11% of the energy reported for conventional synthesis using α-Al2O3 as the raw material. This result indicates that 2.45 GHz microwave irradiation could promote the kinetics of the CRN reaction, and AlN could be effectively synthesized at low temperature.

Original languageEnglish
Pages (from-to)4905-4910
Number of pages6
JournalJournal of the American Ceramic Society
Volume101
Issue number11
DOIs
Publication statusPublished - 2018 Nov

Keywords

  • activation energy
  • aluminum nitride
  • carbothermal reduction
  • microwaves
  • nitridation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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