Aluminum Oxide | Al2O3 | Properties

Explanations of the characteristics of Aluminum Oxide.

Aluminum Oxide (Alumina) Al2O3

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The Properties of Aluminum Oxide (Al2O3)

General properties of Alumina

Aluminum Oxide image

Aluminum Oxide (Al2O3) is the most well known and widely used material in numerous engineering ceramics. So its price is the lowest of all ceramic materials.
Generally it is also referred to as Alumina.

It possesses strong ionic inter-atomic bonding. Thus it has high hardness (next position of diamonds), wear resistance, superior electric insulation and chemical stability.

And it has good heat resistance (1,500°C), plasma resistance,
excellent dielectric properties and is an electrical insulator. On the other hand, it has a relatively high thermal conductivity (40 W/mk).

But its properties of heat shock resistance and fracture toughness are weaker than the other ceramics.

Other properties are excellent size, shape capability, translucency etc.

Uses of Alumina

Industrial mechanical parts:
Parts of semiconductor, liquid crystal and solar panel production device.
Machine tools. Parts of effluent gas resolution devices.
Medical and dental tools.
Standard plate of x-y table, Insulator, Refractory, Abrasive (polishing materials) etc.

Properties chart

(the data below from literatures. In case of Alumina 99%.)
Density
g/cm3
3.85 - 3.99
Mechanical
Bending strength
MPa
320 - 400
Compressive strength
MPa
2400 - 3000
Vickers hardness
HV
1400 - 1800
Electrical
Volume resistivity
Ω•cm
>1014-15
Dielectric constant
e(1MHz)
9.5-9.7
Breakdown voltage
kV/mm
10 - 15
Thermal
Max working temperature
°C
1500 - 1600
Coefficient of thermal expansion
x10-6/°C
7.0 - 7.7
Heat conductivity
W/m•k
23 - 40
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