Alumina (Al2O3) is one of the most widely used, general purpose technical ceramics. Alumina provides several benefits including being extremely hard and wear resistant across a wide temperature range. Alumina is produced by heating tightly packed alumina powder with a binder material. This process produces commercial grades of 90 - 99.95%, with higher purity providing higher hardness.
90%-97% Alumina: most suitable for metal deposition due to its large grain structure.
98%-99.95% Alumina: Commonly available for extruded shapes at low cost.
Zirconia Toughened Alumina (ZTA): is a material that is tougher than Alumina with improved hardness, strength and thermal properties especially at high temperatures.
- Pump piston sleeves
- Bushings & insulators
- Valve seals & seats
- Medical implants
- Die & cutting tool inserts
- Bearing components
We can machine Alumina into a variety of sheets, cylinders, discs and other complex shapes.
|Modulus of Elasticity||48 - 54 x 106 psi|
|Flexural Strength||57 kpsi|
|Compressive Strength||368 kpsi|
|Poisson's Ratio||0.23 - 0.26|
|Fracture Toughness||4.3 MPa m1/2|
|Dielectric Strength||210 - 220 ac V/mil|
|Dielectric Constant||9.7 (@ 1MHz)|
|Volume Resistivity||>1014 Ohm-cm|
|Coefficient of Thermal Expansion||5.1 - 7.2 x 10-6/°C|
|Thermal Conductivity||30.3 - 35.0 W/mK|
|Specific Heat||0.20 cal/g °C|
|Shock Resistance||200°C Diff|
|Maximum Working Temperature||1750 °C|