Brown corundum and white corundum are two common corundum materials, the following are their physical properties and main application:
Physical Properties of Brown Fused Alumina
Composition: The main component is α-aluminum oxide (Al₂O₃), containing a small amount of iron, titanium and other impurities.
Hardness: 9 on the Mohs hardness scale, second only to diamond.
Melting point: about 2050°C.
Density: about 3.95 g/cm³.
Toughness: high, good impact resistance.
Main Application
Abrasives: widely used in the manufacture of grinding wheels, abrasive belts, sandpaper and other abrasives.
Refractory materials: used in the production of refractory bricks, castables, etc.
Sandblasting materials: used for surface cleaning and strengthening treatment.
Ceramic materials: used in the manufacture of ceramic products.
Physical Characteristics of White Fused Alumina:
Composition: High purity α-alumina (Al₂O₃) with very low impurity content.
Color: usually white or light gray.
Hardness: 9 on the Mohs scale.
Melting point: about 2050°C.
Density: about 3.96 g/cm³.
Toughness: slightly lower than brown corundum, but harder.
Main Application
Precision abrasive: used for making high precision grinding wheels, abrasive belts, etc.
Polishing material: used for polishing optical glass and precision parts.
Refractory materials: used in the production of high-purity refractory products.
Electronic materials: used in the manufacture of electronic components and insulating materials.
Summarize
Brown BFA: high hardness, good toughness, suitable for abrasives, refractory materials and sandblasting.
White WHA: high purity and high hardness, suitable for precision abrasives, polishing and electronic materials.
Both are widely used in industry and manufacturing, and the specific choice depends on the application requirements.