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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 |
MPa@room 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.
|
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This information has been sourced, reviewed and adapted from materials provided by FELDCO International.
For more information on this source please visit FELDCO International.