Introduction Alumina ceramic disc
Alumina ceramic disc — Alumina ceramic is the most mature of the engineering ceramics, offering excellent electrical insulation properties together with high hardness and good wear resistance,but relatively low strength and fracture toughness.Alumina ceramics are generally white but may also be pink or ivory.
Characteristics Alumina ceramic disc
Our products include engineered ceramic, strengthened structure ceramic, ceramic bar, ceramic tube, ceramic block, ceramic ring, ceramic cylinder/bushings, ceramic shaft, ceramic plate, ceramic sleeve, ceramic valve, ceramic plunger and ceramic arm, ceramic pin, ceramic metric gauge, ceramic thin plate,etc.
Technical Data Sheet of Alumina ceramic disc
| Item | Test condition | Unit | 96% alumina ceramics | 99% alumina ceramics | 99.5-99.7% alumina ceramics |
| Chemical ingredients | Al2O3 | Al2O3 | Al2O3 | ||
| Bulk Density | g/cm3 | >3.6 | 3.88 | 3.90 | |
| Max. Use Temp. | 1450℃ | 1600℃ | 1650℃ | ||
| Water absorption | % | 0 | 0 | 0 | |
| ROHS Hardness | ≥85 | ≥89 | ≥89 | ||
| Flexural strength | 20℃ | Mpa(psix10^3) | 358(52) | 550 | 550 |
| Compressive Strength | 20℃ | Mpa(psix10^3) | 2068(300) | 2600(377) | 2600(377) |
| Fracture Toughness | K(l c) | Mpa m^1/2 | – | – | – |
| Coefficient of thermal expansion | 25-1000℃ | 1X10^-6/℃ | 7.6 | 7.9 | 8.2 |
| Coefficient of thermal conductivity | 20℃ | W/m.K | 16 | 17-30.0 | 17-30.4 |
| Thermal Shock Resistance | ^Tc | ℃ | 250 | 200 | 200 |
| Dielectricity constant | 1MHz.25℃ | 9 | 9.7 | 9.7 | |
| Dielectric strength | ac-kV/mm(ac V/mil) | 8.3(210) | 8.7(220) | 8.7(220) | |
| Volume Resistivity | 100℃ | ohm-cm | >10^13 | >10^14 | >10^14 |
