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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.119  No.1388 (April) (2011)  >  pp.291-294

Journal of the Ceramic Society of Japan
<<Previous article Vol.119  No.1388 (April) (2011)   pp.291 - 294 Next article>>

Relation between oxygen concentration in AlN lattice and thermal conductivity of AlN ceramics sintered with various sintering additives

Ryota KOBAYASHI1), Yoshiaki MORIYA1), Makoto IMAMURA1), Kazuhiro OOSAWA1) and Katsuyoshi OH-ISHI1)
1) Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University

  Aluminum nitride (AlN) ceramics were fabricated by pressureless sintering with various sintering additives such as 5 mass % Y2O3, 2 mass % Y2O3–3 mass % Al2O3, 3 mass % Y2O3–1 mass % CaO–0.08 mass % B, and 6 mass % Y2O3–2 mass % CaO–0.16 mass % B. The relative density, phases present, lattice parameter c, and thermal conductivity of the samples were evaluated. The oxygen concentration in AlN lattice was estimated from the lattice parameter c by using the relation between the oxygen concentration and the lattice parameter c of AlN. To analyze the effects on the thermal conductivity of the samples, we plotted the oxygen concentration in AlN lattice estimated from the lattice parameters c versus the thermal resistivity, which is inverse of the thermal conductivity measured in this work. The data of the samples sintered with 5 mass % Y2O3 and 3 mass % Y2O3–1 mass % CaO–0.08 mass % B located on the plot of the relation between oxygen concentration in AlN lattice and thermal resistivity of AlN presented by Slack (Slack’s line) or Harris et al. (Harris’s line), respectively. In contrast, the data of the samples sintered with 2 mass % Y2O3–3 mass % Al2O3 and 6 mass % Y2O3–2 mass % CaO–0.16 mass % B, which contain excess grain boundary phases, located above the Harris’s line. It was suggested that the thermal conductivity of the samples could be influenced by the density, the oxygen content in AlN lattice, and the presence of grain boundary phases.


Keyword:
Aluminum nitride, Thermal conductivity, Lattice parameter c, Sintering, Grain boundary

Received: January 12, 2011
Accepted: January 28, 2011 , Published online: April 01, 2011
Copyright (c) 2011 The Ceramic Society of Japan

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