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Calcined Brown Corundum

Calcined brown corundum is a specialized abrasive produced by subjecting conventional brown corundum to high‑temperature treatment. Following this specific calcination process, impurities within the abrasive are either precipitated or volatilized, resulting in a purer material with a rougher particle surface, which significantly enhances its hydrophilicity. At the same time, microcracks generated during crushing are healed, further improving the abrasive’s toughness and strength. Calcined brown corundum exhibits an extremely low coefficient of thermal expansion, excellent hydrophilicity, outstanding toughness, and high mechanical strength; sintered abrasives made from it display a deep blue color after firing, remain free of network‑like cracks, and show no rust spots.

Keywords:

Yeda New Materials

Category:

Abrasive Series

Contact phone number:

+86-18837126599Manager Li /+86-18837129599Manager Zhang /+86-18837183677Manager Li

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Product Details

  • Product Description
    • Commodity name: Calcined Brown Corundum

    Calcined brown corundum is a specialized abrasive produced by subjecting conventional brown corundum to high‑temperature treatment. Following this specific calcination process, impurities within the abrasive are either precipitated or volatilized, resulting in a purer material with a rougher particle surface, which significantly enhances its hydrophilicity. At the same time, microcracks generated during crushing are healed, further improving the abrasive’s toughness and strength. Calcined brown corundum exhibits an extremely low coefficient of thermal expansion, excellent hydrophilicity, outstanding toughness, and high mechanical strength; sintered abrasives made from it display a deep blue color after firing, remain free of network‑like cracks, and show no rust spots.

    Microstructure

    165×

    330×

    The two images above show the microstructural morphology of calcined brown corundum, captured under a metallographic microscope at different magnifications. In the images, the gray‑white areas correspond to α‑Al₂O₃ crystals, the black regions represent porosity, and the blue striations are titanium‑iron compounds.

    As can be seen from the microstructural crystallization map of calcined brown corundum, the α‑Al₂O₃ crystals that primarily contribute to the abrasive action have sizes ranging approximately from 100 μm to over 300 μm; the majority are α‑Al₂O₃ crystals, with a small fraction of FeTiO₃ embedded within the α‑Al₂O₃ matrix.

     

    Product Specifications

    Calcined Brown Corundum It is obtained by high‑temperature calcination of brown corundum, which removes some impurities at elevated temperatures. Chemically, its composition remains largely unchanged compared with brown corundum; however, due to the influence of brown corundum’s coefficient of thermal expansion, particle size may deviate, resulting in a certain degree of material loss.

    Chemical indicators

    Top item

    Typical Analysis (Raw Materials)

    Control range

    Lower limit

    Upper limit

    Al₂O₃ content

    94.0-97.5%

    94.0%

    97.5%

    SiO₂ content

    1.0%

    0.5%

    2.5%

    Fe₂O₃ content

    0.20%

    0.02%

    0.4%

    TiO₂ content

    2.2%

    1.6%

    2.8%

    Particle size distribution

    Complies with GB/2481.1-1998

     

    Codename

    Calcined brown corundum exhibits a deep blue luster; there is no standardized industry designation for it. Currently, the Yeda brand’s calcined brown corundum is designated as: AD:(#).

    A: Represents brown corundum.

    D: denotes calcination; #: suffix particle size code

     

    Physical indicators

    Color: Dark blue

    Appearance: Granular

    Hardness: Vickers hardness: 2000–2300 kg/mm²

    　　　Mohs hardness 8–9 kg/cm²

    Crystal: Alumina true specific gravity: 3.9 ± 0.5 g/cm³

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