Custom 99% Al2O3 Alumina Ceramic Insulating Column High Voltage Ceramic Insulator Post
Alumina ceramic part is produced by firing a tightly packed powder form of Al2O3 which includes some binder material. Commercially available grades range from 90% up to 99.95% with the higher purity generating somewhat higher hardness. Alumina Ceramics are the most highly regarded and widely used of the ceramic products. It is non-conductive, resistant to corrosion, and are perfect for electrical insulation. Alumina Ceramic has proven to be the best ceramic for protection of vital electrical components. It can be processed as tubing, sheets, bars, rods, discs, and many other forms depending on the requirements of the project.
Alumina Ceramic Insulating Column
Alumina ceramic insulating column is a critical advanced ceramic insulator for high-voltage and high-temperature working environments. Manufactured by isostatic pressing and high-temperature sintering, then processed by precision turning and grinding, it delivers stable insulation performance under severe operating conditions.This ceramic insulator combines mechanical support and electrical isolation. It can be made with through holes, stepped bores and flange mounting holes as your requirements. Low dielectric loss and excellent vacuum compatibility prevent leakage and electric breakdown.
Alumina Oxide (Al2O3) Properties:
◆ High Hardness
Strong wear resistance, durable and not easy to wear.
◆ Excellent Thermal Conductivity
The thermal conductivity at room temperature is 30~40W/(m·K), which is higher than that of steel, copper and aluminum.
◆ Good Chemical Stability
Resistant to acid, alkali and salt corrosion.
◆ High Temperature Stability
Withstands 1600℃ high temperature and has high temperature stability.
Key Properties
- High working temperature up to 1600℃
- Excellent electrical insulation performance
- High bending strength & hardness
- Good resistance to acid‑base corrosion
- Custom dimensions and tolerances supported
Applications
Thermocouple protection tubes, furnace insulation components, heating element sleeves, electronic insulating parts, industrial high‑temperature equipment.
| Chemical Formula |
Al2O3 |
| Mechanical |
Density |
3.7 gm/cc |
| Hardness |
2000 Knoop
|
| Tensile Strength |
28 kpsi |
| Modulus Of Elasticity |
41 - 46 x 106 psi |
| Flexural Strength |
51 kpsi |
| Compressive Strength |
300 - 350 kpsi |
| Poissons Ratio |
0.21 |
| Fracture Toughness |
4 - 5 MPa m½ |
| Electrical |
Dielectric Strength |
212 - 220 ac V/mil |
| Dielectric Constant |
9.3 (@ 1 MHz) |
| Volume Resistivity |
> 1014 ohm-cm |
| Thermal |
Coefficient Of Thermal Expansion |
5.2 - 7.9 x 10⁻⁶/°C |
| Thermal Conductivity |
18.0 - 28.0 W/mK |
| Specific Heat |
0.21 cal/g °C |
| Shock Resistance |
300 °C Diff. |
Alumina Ceramics Typical Applications Include:
Wear resistant components,
High pressure nozzles,
Thermocouple tubes,
Electrical Insulators,
Corrosive labware,
Furnace fixtures,
Ballistic armor,
Thread guides,
Laser Tubes,
Pump seals.
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