1.High-heat resistant
2.Resist acid-base corrosion
3.widely used in the machineries and chemical
4.high hardness
5.low price
Ceramic hermetical rings are the ceramic components or accessories which can prevent the liquid or solid particle from leaking between the combined surfaces,or prevent the outside impurities such as dust or moisture from intruding to the inside of machines or instruments.
The products are widely used as the mechanical hermetical components for the industries of metallurgy,mechanism,chemical industry,medication,foodstuff,anti -corrode pumps,motorcar and etc.
95%/99%/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 |
