1.Product description:
Alumina ceramic is kind of structural ceramics, with insulation
resistance, voltage resistance, high strength, good thermal
conductivity, dielectric loss, stable electrical performance
characteristics. Used in electronic ceramic substrates, ceramic
electrical insulation, vacuum devices, devices porcelain, spark
plugs and other products. We can make the part by hot injection
pressing, dry pressing, isostatic pressing and extrusion productive
technology etc
2.Features:
1) Material: 95%~99.7% AL2O3
2)Method of molding: CIP
3) High chemical etching resistance..
4)High temperature up to 1800°C
5)Color: white, Ivory , pink
6)Surface finish: min Ra0.4& maxRa0.8um
3.Applicatios:
1)Pump seals and other components
2)Wear resistant inserts
3)Insulating washers or bushings
4)Semiconductor components
5)Aerospace components
6)Automotive sensors
7)Electrical or electronic insulators
4.Property of ceramic eyelets:
| 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 | | | 1550°C | 1700°C | 1800°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 |
