Abstract
Crystallization of the glassy grain‐boundary phase in a series of sialon ceramics fabricated using a range of hot‐pressing schedules increased the thermal diffusivity at room temperature by an average of ∼10%. For samples made by a given hot‐pressing schedule, the relative difference in thermal diffusivity between composites containing a glassy grain‐boundary phase and those in which this phase had crystallized decreased with increasing temperature. This behavior is attributed to enhanced phonon scattering in the crystalline grain‐boundary phase.
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