Alumina is one of the most popular ceramics due to its high hardness, wear and chemical resistance. Alumina used in our products provides high electrical strength, therefore, it is often utilised as insulators. Compared to other ceramics, alumina is an excellent heat conductor. Alumina is characterized by a high maximal operating temperature, but it is not very resistant to thermal shocks.
This material is used for machines and devices parts subject to fast wear and elements revealing insulating properties. Alumina is used to make pump plungers, valve balls, screws, pipe and elbow linings, refractory elements, insulators and insulating elements.
Properties of corundum with different alumina contents
| Properties/Material | Al2O3 99,7% | Al2O3 98% | Al2O3 96% | Al2O3 92% |
|---|---|---|---|---|
| Apparent density, g/cm3 | 3,90 | 3,88 | 3,75 | 3,70 |
| Bending strength, MPa | 380 | 363 | 338 | 330 |
| Young’s modulus, GPa | 300 | 280 | 280 | 220 |
| Electric strength, kV/mm | 17 | 15 | 15 | 15 |
| Resistance, Ω.m at 20oC at 200oC at 600oC | >1014 >1012 >108 | >1014 >1012 >108 | >1014 >1012 >108 | >1014 >1012 >108 |
| Heat shock resistance, K | 150 | 140 | 140 | 140 |
