Effect of grain contiguity on the thermal diffusivity of aluminum nitride

Masahiko Tajika, Hideaki Matsubara, William Rafaniello

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Thermal diffusivity of AlN-based ceramics was studied as a function of second-phase amount and heat-treatment time. The Y2O3·Al2O3 contents varied over the range of 13-31 vol%. The thermal diffusivity decreased as the amount of second phase increased. After sintering at 1850°C, the AlN ceramics consisted of rounded, largely isolated grains. Heat treatment of these samples for 5-50 h at 1800°C resulted in microstructures that consisted of largely contiguous AlN grains. There was a substantial increase in the thermal diffusivity after the heat-treatment step, and the incremental improvement was essentially constant for the three compositions that have been studied. The amount of second phase was unchanged during heat treatment; therefore, the increase in thermal diffusivity is assumed to be a direct result of the enhanced contiguity of AlN grains.

Original languageEnglish
Pages (from-to)1573-1575
Number of pages3
JournalJournal of the American Ceramic Society
Issue number6
Publication statusPublished - 1999 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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