Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 14, Pages 16873-16879Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.06.125
Keywords
Porosity; Thermal conductivity; Mullite; Transition metal oxides
Categories
Funding
- European Regional Development Fund [ERDF 1.1.1.1/16/A/077, PVS 2587]
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Porous mullite-corundum refractory ceramics were produced by a patented slurry slip casting method from compositions based on commercially available alpha-Al2O3 and gamma-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 gamma-Al2O3 modification to alpha-Al2O3 and on the structure of mullite ceramics.
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