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The Most Well-known Oxide Ceramic Material
Alumina or aluminum oxide (Al2O3) in its various levels of purity is used more often than any other advanced ceramic material. CeramTec offers a wide range of material types with different property profiles that can be adjusted via a targeted matrix design.
Aluminium oxide Related Data
| Main component | 99%Al2O3 | S-SiC | ZrO2 | Si3N4 | ||
| Physical Property | Density | g/cm3 | 3.9 | 3.1 | 6 | 3.2 |
| Water Absorption | % | 0 | 0.1 | 0 | 0.1 | |
| Sinter Temperature | °C | 1700 | 2200 | 1500 | 1800 | |
| Mechanical Property | Rockwell Hardness | HV | 1700 | 2200 | 1300 | 1400 |
| Bend Strength | kgf/mm2 | 3500 | 4000 | 9000 | 7000 | |
| Compression Intensity | Kgf/mm2 | 30000 | 20000 | 20000 | 23000 | |
| Thermal Property | Maximum working temperature | °C | 1500 | 1600 | 1300 | 1400 |
| thermal expansion coefficient 0-1000°C | /°C | 8.0*10-6 | 4.1*10-6(0-500°C) | 9.5*10-6 | 2.0*10-6(0-500°C) | |
| 5.2*10-6(500-1000°C) | 4.0*10-6(500-1000°C) | |||||
| Thermal Shock resistance | T(°C) | 200 | 250 | 300 | 400-500 | |
| Thermal Conductivity | W/m.k(25°C | 31 | 100 | 3 | 25 | |
| 300°C) | 16 | 100 | 3 | 25 | ||
| Electrical Property | Resisting rate of Volume | ◎.cm | ||||
| 20°C | >1012 | 106-108 | >1010 | >1011 | ||
| 100°C | 1012-1013 | – | – | >1011 | ||
| 300°C | >1012 | – | – | >1011 | ||
| Insulation Breakdown Intensity | KV/mm | 18 | semiconductor | 9 | 17.7 | |
| Dielectric Constant (1 MHz) | (E) | 10 | – | 29 | 7 | |
| Dielectric Dissipation | (tg o) | 0.4*10-3 | – | – | – | |
Aluminum oxide (Al2O3) has an exceptional set of properties:
All these combinations make the material irreplaceable in the manufacture of corrosion-resistant, wear-resistant, electrical insulating and heat-resistant products for a variety of industries.
There are two main types of aluminum oxide:
Dense Aluminum Oxide (Al2O3)
This material is used in production of responsible and mechanically
loaded products, i.e. mainly as engineering and structural
ceramics. The material has excellent corrosion-resistant,
wear-resistant, electrical insulating and heat-resistant
properties, in addition to resistance to thermal shock. If a
thermal shock is present during operation, it is recommended to use
refractory materials.
There are several modifications of dense aluminum oxide depending on the content of the main phase and admixtures, which differ in strength and chemical resistance (ALOX-AP, ALOX-HP).
Basic properties of the material
| Properties | Brand of material | |
| ALOX-AP | ALOX-HP | |
| Al2O3 94-96% | Al2O3 99,7% | |
| Density, g/sm3 | 3,6-3,7 | 3,8-3,9 |
| Isolated porosity, % | 0 | 0 |
| Hardness, GPa | 12-13 | 15-17 |
| Flexural strength, MPa | 300-330 | 350-400 |
| Compressive strength, MPa | 2000-2200 | 2000-2400 |
| Thermal conductivity at 20-100°С, W/mK | 20-25 | 28-33 |
| Coefficient of linear thermal expansion at 20-1000°С, 10-6К-1 | 7,0-8,0 | 7,0-8,0 |
| Maximum operating temperature Oxidative environment A reducing or inert environment | 1500 1500 | 1750 1750 |
The main applications are:
