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Preparation and Phase Transformation of Mullite-Zirconia from Boehmite and Algerian Halloysite

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Raghdi A., Heraiz M., Sahnoune F., Ouali A., Redaoui D.
Acta Physica Polonica A
|
2017
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vol. 131
|
issue 1
136-138
EN
In this work, mullite-zirconia composite were fabricated by reaction sintering of Algerian halloysite Al₂Si₂O₅(OH)₄, boehmite Al(OOH), and zirconia (ZrO₂) powder using conventional heating. The appropriate amount of the three raw powders was ball milled for 5 h and sintered between 1250 and 1650°C for 2 h. A scanning electron microscope was used to characterize the microstructure of sintered samples. A dilatometer and X-ray diffractometer were used to analyze the formation and transformation of phases. It is found that for the addition of zirconia up to 20wt.% the zirconia phase retains its tetragonal structure. The formation of primary mullite in all samples was complete at 1220°C. The cristobalite started to form at 1350°C, and disappeared at 1500°C in the samples of mullite, and at 1450°C when ZrO₂ was added. The zircon compound ZrSiO₄ started to form at 1350°C and completely disappeared at 1550°C. The increase in ZrO₂ ratio promoted the formation of grains with a spherical shape.
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