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Brown aluminum oxide advantage and uses

Brown Aluminum Oxide

ItemValue
Chemical FormulaAl₂O₃
Main ContentAl₂O₃ ≥ 95.0%
Mohs Hardness9
True Density3.8–4.0 g/cm³
Bulk Density1.0–1.5 g/cm³
Melting Point~2050 °C
Crystal StructureCorundum
ColorBrown to dark brown
Grain ShapeAngular, sharp edges

Chemical Composition

ComponentContent (Typical)
Al₂O₃≥ 95.0%
TiO₂1.5 – 3.5%
Fe₂O₃≤ 0.5%
SiO₂≤ 1.2%
CaO + MgO≤ 0.5%
Free SilicaNone

                               

Brown Aluminum Oxide Main Applications

  1. Abrasives & Grinding Tools
    • Grinding wheels
    • Sanding belts & discs
    • Cut-off wheels
    • Resin-bonded and vitrified abrasives
  2. Sandblasting & Surface Treatment
    • Rust removal
    • Paint stripping
    • Surface preparation before coating or welding
    • Deburring and deflashing
    • Cleaning for metal, steel, cast iron, and stone
  3. Refractory Materials
    • High-temperature refractory bricks
    • Monolithic refractories
    • Furnace linings
    • Slide gate plates
  4. Coated Abrasives
    • Sandpaper
    • Emery cloth
    • Industrial abrasive sheets
  5. Polishing & Lapping
    • Polishing metals, glass, ceramics, and stone
    • Lapping for precision surfaces
  6. Anti-Slip & Wear-Resistant Materials
    • Anti-slip flooring additives
    • Wear-resistant coatings
    • Concrete and pavement additives
  7. Ceramic & Composite Materials
    • High-strength ceramic products
    • Reinforced composite fillers

Advantages of Brown Aluminum Oxide

  1. High hardness and cutting efficiency
    • Mohs hardness ~9, very aggressive for grinding, sandblasting, and surface preparation.
  2. Good toughness & long service life
    • Resists shattering under impact; reusable many times in blasting operations.
  3. Excellent self‑sharpening property
    • Particles fracture to create new sharp edges during use, maintaining high performance.
  4. Good thermal stability
    • Suitable for high‑temperature grinding and refractory applications.
  5. Good chemical resistance
    • Stable in most acidic and alkaline environments.
  6. Cost‑effective
    • Lower price than white aluminum oxide, pink fused alumina, or diamond abrasives.
  7. Wide applicability
    • Works well for steel, cast iron, stainless steel (in many cases), alloys, stone, and concrete.
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