Journal of Materials Science

, Volume 27, Issue 10, pp 2627–2630 | Cite as

Thermal conduction mechanism of aluminium nitride ceramics

  • K. Watari
  • K. Ishizaki
  • T. Fujikawa


Extremely large grain size AIN ceramics were produced by HIP sintering at an ultra-high temperature of 2773 K without reducing the oxygen content in order to determine experimentally whether the factor controlling thermal conductivity is either grain boundaries or the internal structure of the grains. The room-temperature thermal conductivity of the HIPed AIN with a grain size of ∼40 μm was 155 Wm−1 K−1, and was almost equal to that of the normally sintered AIN with a grain size of 4 μm. Therefore, thermal conductivity at room temperature is independent of AIN grain size, or the number and amount of grain-boundary phase for reasonably well-sintered AIN ceramics. The calculated phonon mean free path of sintered bodies was 10–30 nm at room temperature, which is too small to compare with the AIN grain size. Consequently, it is shown that the thermal conductivity of sintered AIN is controlled by the internal structure of the grains, such as oxygen solute atoms.


Oxygen Polymer Aluminium Grain Size Thermal Conductivity 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • K. Watari
    • 1
  • K. Ishizaki
    • 1
  • T. Fujikawa
    • 2
  1. 1.Department of Materials Science and Engineering, School of Mechanical EngineeringNagaoka University of TechnologyNagaokaJapan
  2. 2.Isostatic Pressing Centre, Industrial Machinery GroupKobe Steel Co. LtdKobeJapan

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