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Structural and Microstructural Properties of Fused ZrO2-Mullites

Silimanite and zircon rich sea beach sand is taken with alumina powder for the synthesis of fused zirconia mullite (MUZ) composites by extended arc thermal plasma reactor. The bulk density value of fused MUZ (∼3.79 g/cm3) is well comparable to the density value of commercial available MUZ (∼3.6 gm/cm3). The electron probe microstructure analysis predicts that alumina is rich in mullite grains, whereas the grain boundary region is rich with zirconia. A small percentage of zirconia is also present in the intragrain region, which reveals that mullite compound is surrounded by well-structured and compacted zirconia. The X-ray photoelectron spectrum reveals the presence of mullite phase along with crystalline Si in the composites.