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Corundum mullite is a ceramic material with corundum (α - Al2O3) and mullite (3Al2O3 · 2SiO2) as the main crystal phases. Corundum mullite has high refractoriness, good chemical resistance, oxidation resistance, and excellent thermal stability, and is commonly used as lining and insulation layer for high-temperature kilns. Corundum mullite plays an important role in industrial applications due to its high refractoriness and excellent comprehensive properties.