Alumina ceramic bushings are widely used in electronic and electrical industries because of their high electrical insulation, ultra-high hardness and compressive strength. Alumina is an excellent high temperature ceramic material due to its high temperature stability. It is the most commonly used type of advanced ceramics with a purity of between 95% and 99.8%.
Applications Of Alumina
Alumina ceramics are characterized by extremely high hardness and wear resistance, low erosion levels, high temperature resistance, corrosion resistance and biological inertness. As a result, Al2O3 ceramic products are ideal for many industries, such as:
1. Electrical wires and wire conduits;
2. Mechanical seals;
3. Machine parts;
4. High temperature electrical insulators;
5. High voltage insulators;
6. Electronic parts substrates;
7. Roller and ball bearings;
8. Wear-resistant linings;
9. Semiconductor parts;
10. Precision shafts and axes in high wear environments.
Properties Of Alumina (From 95%-99.8%)
1. Excellent electrical insulation (1 × 10 14 ~ 1 × 10 15 Ω cm);
2. Medium to ultra-high mechanical strength (300 to 630 MPa);
3. Very high compressive strength (2000 to 4000 MPa);
4. High hardness (15 to 19 GPA);
5. Medium thermal conductivity (20 to 30 W / MK);.
6. High corrosion and wear resistance;
7. Good grinding performance;
8. Low density (3.75 to 3.95 g / cm3);
9. Operating temperature of 1000 to 1500°C without mechanical load;
10. Biological inertia, food compatibility.
The Properties Of 99.8% Alumina Are As Follows:
| Properties | Test Conditions | Units | Value |
| Alumina Content | – | ％ | 99.8 |
| Color | – | – | Ivory |
| Bulk Denstity | – | g/cm3 | 3.89 |
| Water-absorption | – | % | 0 |
| Grain Size | – | μm | 4-5 |
| Vickers Hardness, HV1.0 | Load 4.9N | GPa | ≥15 |
| Flexural Strength, RT | – | MPa | ≥300 |
| Coefficient of Linear Expansion | 20～500℃ | 1×10-6mm/℃ | 6.5～7.5 |
| 20～800℃ | 6.5～8.0 | ||
| Thermal Conductivity, RT | 20℃ | W/m・K | ≥20.9 |
| Specific Heat Capacity | – | kJ/(kg・K) | ≥0.8 |
| Dielectric Strength | – | KV/mm | ≥12 |
| Electrical Resistivity, RT | 20℃ | Ohm.cm | ≥1014 |
| 300℃ | ≥1011 | ||
| 500℃ | ≥109 | ||
| Permittivity | 1MHz | – | 9～10 |
| Dielectric DissipationFactor | 1MHz | – | ≤3×10-4 |
| Surface Roughness | – | μm | 0.1～0.4 |
Alumina Ceramics Production and Processing Factory
Xiamen Innovacera Advanced Materials Co., Ltd. has been engaged in precision technical ceramics for ten years and has rich experience in grinding, lapping and polishing of alumina ceramics. We accept customization:
1．Manufacture products according to drawing requirements;
2．Manufacture of more complex products;
3．Low MOQ ;
4．Achieving higher dimensional accuracy;
5．Achieving fast response and delivery;
6．Providing more specialized services;
7．Realizing the thrust of customer satisfaction.
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