High alumina ceramic bushing
1.Material: 95%/99%/99.5%/99.7% alumina ceramic
2.Specification can be customed
High alumina ceramic bushing
95%/99%/99.5%/99.7% Al2O3 Material Parameters:
Item | Test Condition | Unit&Symbol | 95%Alumina ceramics | 99%Alumina ceramics | 99.7%Alumina ceramics |
The main chemical ingredient |
|
| Al2O3 | Al2O3 | Al2O3 |
Bulk Density |
| g/cm3 | 3.6 | 3.89 | 3.96 |
Maximum Use Temperature |
|
| 1450°C | 1600°C | 1650°C |
Water absorption |
| % | 0 | 0 | 0 |
ROHS Hardness |
|
| ≥85 | ≥89 | ≥89 |
Flexural strength | 20° C | MPa (psi x 103) | 358 (52) | 550 | 550 |
Compressive Strength | 20° C | MPa (psi x 103) | 2068 (300) | 2600(377) | 2600(377) |
Fracture Toughness | K(I c) | Mpa m1/2 | 4-5 | 5.6 | 6 |
Coefficient of thermal expansion | 25-1000° C | 1X 10-6/°C | 7.6 | 7.9 | 8.2 |
Coefficient of thermal conductivity | 20° C | W/m °K | 16 | 30.0 | 30.4 |
Thermal Shock Resistance | Tc | °C | 250 | 200 | 200 |
Dielectricity constant | 1MHz.25°C |
| 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°C | ohm-cm | > 1013 | > 1014 | > 1014 |
| Dimension | Outer dia. mm | Inner dia.mm | Length mm | Remark | |
| Item | |||||
| Thermocouple protection tube | 7-120 | 1-110 | 10-2000 | If you need others,we can customize for you. | |
| Insulated tube | Single hole | 2-120 | 1-110 | 10-2000 | |
| (inner core) | Double holes | 1-10 | 0.4-2 | 10-2000 | |
| Four holes | 2-10 | 0.5-2 | 10-2000 | ||
| Feature | Application | Main usage |
| 1.Great mechanical strength | Electric appliance industry Automotive industry | 1.Heat treatment furnace and toughened furnace |
| 2.High softening temperature | ||
3.Good resistance to thermal impact | ||
4.Small thermal expansion coefficient | Mechanical industry Engineer industry | 2.Inner liner tube and heating tube in electric furnace |
5.Good chill and abrupt heat properties | ||
6. Resistance to acid and alkali corrosion |
