Thermal shock resistance of porous alumina ceramics with different internal and external porosity
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Porous alumina ceramics with porosity of 24.42-41.10% were prepared by gel casting process with polymethylmethacrylatemicrosphere(PMMA) as pore-forming agent. The mechanical/thermal properties and porosity of the obtained ceramic areinfluenced by two structures that composed of spherical shaped micro pores(external pores) depending on PMMA content andirregular sub-micro pores(internal pores) formed by the stacking of ceramic particles. Mechanical properties and thermalconductivity decreased as the porosity increased. The thermal shock resistance of the samples was excellent when the porositywas 33.45%. This phenomenon caused by the matching of external and internal pores is inconsistent with the trend of thermalshock fracture resistance and thermal shock damage resistance varying with porosity in previous researches. In the case of thesame total porosity, the introduction of external pores improved the mechanical properties and critical temperature difference,reduced the thermal conductivity and fracture surface energy that affected the thermal stability of the material.
Abstract
Porous alumina ceramics with porosity of 24.42-41.10% were prepared by gel casting process with polymethylmethacrylatemicrosphere(PMMA) as pore-forming agent. The mechanical/thermal properties and porosity of the obtained ceramic areinfluenced by two structures that composed of spherical shaped micro pores(external pores) depending on PMMA content andirregular sub-micro pores(internal pores) formed by the stacking of ceramic particles. Mechanical properties and thermalconductivity decreased as the porosity increased. The thermal shock resistance of the samples was excellent when the porositywas 33.45%. This phenomenon caused by the matching of external and internal pores is inconsistent with the trend of thermalshock fracture resistance and thermal shock damage resistance varying with porosity in previous researches. In the case of thesame total porosity, the introduction of external pores improved the mechanical properties and critical temperature difference,reduced the thermal conductivity and fracture surface energy that affected the thermal stability of the material.
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