ملخص: The aim of this work is to study some aspects of the thermal shock of mullite ceramic. Mullite samples are submitted to mild thermal shock by quenching in a compressed air flow using a Biot number [beta]=0.3. The cooling duration is 6 s with a superficial heat exchange coefficient h=600 W/m2[deg]C. This duration is sufficient for the transient thermal stress to reach its maximal value. The critical temperature difference [Delta]TC found equal to 750 [deg]C was obtained by measuring the retained mechanical strength and the Young's modulus. For determining the failure time and [Delta]TC, we used the acoustic emission technique. Finally, the thermal shock experiments are modelled by a two dimensional cooling model, allowing a precise determination of the induced stress intensity factor KI.

لغة: إنجليزية