Abstract
The mullite-zirconia composites were prepared by reaction-sintering of alumina and zircon powder. Besides, the slip casting method was employed for fabrication of these composites. Then, the effect of nano-TiO2 addition on the properties of these composites was investigated and the results were compared with micro-sized TiO2. Hence, the physical properties, phase composition, flexural strength and microstructure of these composites after firing at 1600?C were studied. The results showed that the flexural strength of composite tends to increase with the addition of 0.5 wt.% nano-TiO2. It is attributed to the formation of larger size rod-like ZrO2 and enhanced ceramic bonding between them.
Highlights
The mullite–zirconia composites are materials with important technological applications due to their good properties such as toughness, chemical stability, high–creep resistance and good thermal shock resistance
The mullite–zirconia composites containing different amounts of micro and nano– TiO2 particles were prepared by reaction-sintering of alumina and zircon powder
This study confirmed the strong influence that nano–TiO2 particles exert on the microstructure and flexural strength of mullite–zirconia composites
Summary
The mullite–zirconia composites are materials with important technological applications due to their good properties such as toughness, chemical stability, high–creep resistance and good thermal shock resistance. They are employed in the glass industry and where a high chemical and corrosion stabilities are required [1,2,3,4,5,6]. Without sintering aids or stabilizing oxides, the densification is achieved at 1450–1500 °C and the complete mullitization occurs at temperatures near 1600 °C [4,5,6,7, 13].
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