Aluminium Oxide Ceramics
Alumina Ceramic

Aluminium Oxide Ceramics

Aluminum Oxide, also known as alumina, is a hard wearing advanced technical ceramic material frequently used in a wide variety of industrial applications. Once fired and sintered, it can only be machined using diamond-grinding methods. It features high hardness and wear resistance, low erosion levels, high temp. resistance, corrosion resistance, and bioinertness. Additionally, it can be highly polished, making it useful for a wide range of applications. Frequently used alumina's purity is from 90% to 99.7%.

Main Properties of Alumium Oxide Ceramics
 
 Type Unit  A95 A99
 Alumina Content %   92 - 96   99 - 99.7
 Density g/cm3  3.65  3.88
 Color - white ivory 
 Water Absorption % 0 0
 Young Modulus Gpa 280 350
 Vickers Hardness Gpa 14 20
 Compressive Strength Mpa  2000 2500
 Flexural Strength Mpa  280 300
 Thermal Conductivity  W/m.K  18 - 25 30 - 35
 Thermal Shock Resistance Δ(°C) 220 180 200
 Max. Working Temp. °C 1500 1700
 Volume Resistivity Ω ·cm > 10^15 > 10^14
 Dielectric Constant - 9.50 9.80
 Dielectric Strength kV/mm 16 22
* Tests under room temperature environment;
* The above information is offered for comparison only. Exact
properties will vary depending on the manufacturing method
and part configuration.
Applications of Alumium Oxide Ceramics
 
- Seal faces
- Valve seats
- Machine components
- High temperature electrical insulators
- High voltage insulators
- Electronic components & substrates
- Ballistic armor
- Roller & Ball bearings
- Wear or corrosion resistant linings
- Semiconductor parts
- Laser cavities
- Tap plates
- Shot blasting nozzles
- Knife sharpeners
- Microwave components
- Frictionless clutches
- Kiln furnitures