Influence of ZrO2 and WO3 doping additives on the thermal properties of porous mullite ceramics |
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Authors: | Ludmila Mahnicka-Goremikina Ruta Svinka Visvaldis Svinka |
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Affiliation: | Institute of Silicate Materials, Riga Technical University, 3/7 Paula Valdena Street, Riga LV-1048, Latvia |
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Abstract: | Porous mullite-corundum refractory ceramics were produced by a patented slurry slip casting method from compositions based on commercially available α-Al2O3 and γ-Al2O3, fused SiO2 and kaolin. Pores were formed as a result of a chemical reaction of aluminium with water. The influence of usage of raw materials and doping additives such as micro-size ZrO2 and WO3 on the sintering temperature, formation of crystalline phases, linear thermal expansion, thermal conductivity and thermal shock resistance of mullite-corundum ceramic was studied. The best thermal shock resistance and, simultaneously, lower thermal conductivity was achieved for the samples doped with WO3. This was due to the influence of micro-sized WO3 on the change in γ-Al2O3 modification to α-Al2O3 and on the structure of mullite ceramics. |
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Keywords: | B. Porosity C. Thermal conductivity D. Mullite D. Transition metal oxides |
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