Introduction Alumina ceramic washer
Alumina ceramic washer is made from alumina ceramic materials based on alumina (Al2O3). Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina ceramics is a versatile ceramic. Because of its superior performance, it has been widely used in modern society, satisfying the needs of daily use and special performance.
Characteristics Alumina ceramic washer
Alumina ceramic washer has very good wear-resistance, shock resistance, and convenient construction ect. They are wear-resisting and ideal material for material transportation equipment in industry such as petroleum, mine, steelworks, electric plant. And they can prolong the using cycle of equipment effectively.
Technical Data Sheet of Alumina ceramic washer
| 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 |
