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White Fused Alumina (WA) is produced by bayer alumina in an electric arc furnace at high temperatures. The product shows higher hardness and lower toughness than that of brown aluminium oxide. The materials are used to grind high carbon steel, high speed steel and chilled steel. It can also be used as polishing materials and precision founding sand, spraying and coating materials, catalyst carrier, special ceramics and super refractory materials.
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Physical Characteristics
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Item
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Basic mineral
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Crystal system
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Crystal color
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Mohs
hardness
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Density
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White aluminum oxide
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α- Al2O3
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Hexagonal
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White
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9
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≥3.90g/cm3
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Item
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Micro hardness
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Electrical
resistivity
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Grinding ability(compared with
diamond as one)
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Linear expansion
coefficient(when 900ºC α•10-6k-1)
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White aluminium oxide
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HV2200-2300
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1014-1016Ω•cm
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0.12
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8.3
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Note: Special requirements on chemical composition and other terms can be satisfied through discussion.
Parameter Index
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Chemical Composition
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Physical Composition
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AL2O3 ≥ 99.5
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Color:White
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Na2O ≤ 0.35
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Mohs Hardness: 9
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Fe2O3 ≤ 0.1
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Micro hardness: 2200-2300kg/mm2
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SiO2 ≤ 0.1
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Bulk Density: 3.50g/cm3
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Melting Point: 2250ºC
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