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Alumina

Alumina raw materialsAlumina is the most important oxide-ceramic material and a significant module in our production programme. Its most outstanding properties in keeping as:

Typical characteristics:

  • Good flexural strength
  • Very high hardness and wear resistance
  • Very high corrosion resistance
  • High thermal stability
  • Excellent dielectric properties

Our 99.5% purity is very small grain size results in a fine and fibre friendly surface.
These strengths pre-determine its use, for instance, extrusion cores, pump sleeves, high voltage insulators and grinding media for mills.

ALUMINIUM OXIDE (Al2O3)
Al2O3 % 99.5 95
H20 Absorption % 0 0
Color - White White
Density g/cm3 3.9 3.7
Hardness Moh’s 9 9
Flexural Strength MPa 370 320
Compressive Strength MPa 2600 2200
Fracture Toughness(Kic) MPa m1/2 4.6 4.0
Thermal Expansion
Coefficient(20°C-1000°C)
1*10-6
/°C
8.2 7.8
Thermal Conductivity W/m K 30 24
Max. Service Temperature °C 1600 1400
Dielectric Loss Tangent - 1*10-4 3*10-4
Dielectric Constant 1MHz 9.7 9.0

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FAX: 86-573-82052685

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