Editorial Feature

Alumina Al2O3 - Properties of Aluminum Oxide

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Alumina (Al2O3) - Aluminum Oxide

Aluminum Oxide (Alumina, Al2O3) is the most versatile engineered ceramic because of its high temperature service limit along with its chemical, electrical and mechanical properties. It is also relatively low cost, is easily formed and finished using a number of fabrication methods. It is often compounded with silica or trace elements to enhance its properties or fabrication and commonly will range from 92% to 99.9% Al2O3. Alumina engineered ceramic parts can be formed by single axis pressing

Alumina is one of the most widely specified, general-purpose technical ceramics. All aluminas are very hard and wear resistant, with high compressive strength even against extreme temperatures and corrosive environments. Alumina is also excellent electrical insulators and is gas tight.

Alumina Properties

Provided in the table below are properties of grades of alumina supplied by FELDCO INTERNATIONAL.

Properties Units
Aluminum Oxide998
Aluminum Oxide995
Density g/cm3
3.9
3.8-3.9
Color -
ivory
ivory/white
Water Absorption %
0
0
Flexural Strength [email protected] temp.(R.T.)
400
310-379
Compressive Strength [email protected]
3180
2070-2620
Hardness GPa
14.0-15.0
13.8-17.6
Coefficient of Linear Thermal Expansion 1x10-6/°C
8.0
9.0-9.4
Thermal Conductivity W/m°[email protected]
29.5
25.1-35.6
Specific Heat cal/g°[email protected]
0.21
0.19-0.21
Thermal Shock Resistance D T(°C)
250
200
Maximum Use Temperature °C
1800
200
Volume Resistivity [email protected]
>1014
1014
Dielectric Contact [email protected]
9.8
9.6-10.

This information has been sourced, reviewed and adapted from materials provided by FELDCO International.

For more information on this source please visit FELDCO International.

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