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Alumina Bushing
Al2O3 Ceramic Bushing
Ceramic bushings are ceramic tubes for industrial parts. Ceramic bushings can be used with industrial parts by welding, bonding, or metal embedding. Usually, ceramic bushings are used to protect equipment components. It can reduce equipment wear, and vibration, reduce noise, and have anti-corrosion effects. It can also facilitate the maintenance of mechanical equipment and simplify equipment structure and manufacturing processes. In valve applications, bushings are installed on the valve stem to reduce valve leakage and provide sealing. In bearing applications, the use of bushings can reduce wear between the bearing and the shaft box and prevent the increase of the gap between the shaft and the hole. Edgetech provides Alumina bushings with high hardness and mechanical strength, good wear resistance, high-temperature resistance, good electrical insulation, and good corrosion resistance.
Specifications of Typical Alumina Ceramics
| Item | Unit | Al2O3 |
| Physical Property | ||
| Color | Ivory | |
| Density | g/cm3 | 3.7-3.9 |
| Purity | % | 95~99.8 |
| Gas Permeability | 0 | |
| Water Absorption | 0% | |
| Mechanical Properties | ||
| Vickers Hardness | GPa | 12.3-17.2 |
| Flexural Strength | MPa | 300-380 |
| Compressive Strength (HV0.5) | MPa | 2000-2350 |
| Elastic modulus | GPa | 270-380 |
| Fracture Toughness | MPam1/2 | 3.5-4 |
| Thermal Properties | ||
| The Max Working Temperature | ℃ | 1650 |
| Thermal Conductivity at room temperature | W/(m·K) | 20-32 |
| Coefficient of Thermal Expansion | 10-6/℃ | 6.5-7.2 |
| Thermal Shock Resistance | △T℃ | 200 |
| Electrical Properties | ||
| Dielectric Strength | KV/mm | 10-15 |
| Dielectric Constant | 9-10 | |
| Dielectric Loss Angle(1MHz) | 0.0002-0.0003 | |
| Volume Resistivity | Ω·cm | >1014 |
The above chart just demonstrates the typical properties of common alumina ceramic we use to produce our alumina parts. Please notice that the properties of customized alumina parts vary due to different processing. Edgetech Industries, Advanced Ceramics Division provides alumina products according to your specified instructions or does its best to meet requirements.
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Boron Nitride Tube -
BN Tubes
Alumina Ceramic bushing types
-Multi-groove and capped bushings
-Notched bushings
-Tubular bushings
-Cylinder and cylindrical bushings
Packing of alumina ceramic bushing
As a ceramic material, Alumina Bushing is quite fragile in a lot of cases. Our Alumina Ceramics are carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used, and vacuum packing is also engaged for some of the parts.