Abstract
Thermal diffusivity of various AIN-based ceramics obtained by hotpressing or hot isostatic pressing has been measured at room temperature using the laser-flash technique. It is shown that diffusivity: (i) depends on nature and oxygen contents of the starting powders; (ii) decreases with porosity of the materials, especially near to theoretical density; (iii) is strongly influenced by the nature and amount of sintering aids (BeO, MgO, CaO, Y2O2...) used for densification, as a result of microstructural effects. For a given additive, the best performances are expected when using firing temperatures which allow the formation of a fairly viscous liquid phase and its subsequent location at triple points of the grain boundaries.
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Hafidi, A., Billy, M. & Leompte, J.P. Influence of microstructural parameters on thermal diffusivity of aluminium nitride-based ceramics. J Mater Sci 27, 3405–3408 (1992). https://doi.org/10.1007/BF01116044
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DOI: https://doi.org/10.1007/BF01116044