Thermal Shock Testing on Mullite/Mo FGM Disks Using an Infrared Radiation/Water Flow Technique

概要

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Multilayered mullite/Mo functionally graded material (FGM) disks with different composition gradient were fabricated by a powder stacking method and a pulse electric current sintering (PECS) technique. Thermal shock tests on the FGMs were carried out using a newly developed infrared radiation/water flow technique. The thermal stress distribution in the FGM plates during thermal shock was estimated. The stress behavior on the ceramic surface was evaluated by taking into account the influence of residual thermal stress introduced during fabrication process. The present work show that the thermal stress generated during thermal shock loading and the sintering-induced residual thermal stress can be controlled by adjusting the compositional profiles in the FGMs. The results indicate that the thermal shock resistance was greatly influenced by the residual thermal stress on the ceramic surface.
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