Alumina Ceramic
- Machining diameter 10-550mm
- Machining tolerance ≥0.02mm
Alumina (Al₂O₃) is a highly durable advanced ceramic material that combines excellent mechanical and electrical properties, making it suitable for a wide range of industrial applications.
Alumina ceramics feature high hardness, outstanding wear resistance, strong corrosion resistance, and high temperature stability, while being non-toxic and safe for use.
Alumina Material Grades (Al₂O₃ Content Comparison)
Five alumina grades are available: 92%, 95%, 99%, 99.5%, and 99.7% alumina ceramics. Due to differences in manufacturing processes, these grades exhibit varying performance characteristics.
Performance between conventional ceramics and high-purity ceramics; primarily used for wear resistance
Balanced overall performance with good wear and corrosion resistance; cost-effective and widely used
High purity with significantly improved hardness, wear resistance, corrosion resistance, and high-temperature stability
Higher purity and lower impurity levels; superior dielectric properties and chemical stability, suitable for precision electronics and high-frequency devices
Ultra-high purity close to theoretical limits; exceptional insulation, wear resistance, and chemical inertness for high-end applications
Key Technical Parameters Comparison
Physical
Thermal
Chemical
Electrical
| Parameter | Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
|---|---|---|---|---|---|
| Density (g/cm³) | 3.6-3.65 | 3.65-3.71 | 3.90-3.95 | 3.93-3.96 | 3.95-3.98 |
| Hardness (HRA) | 83-85 | 85-88 | 88-90 | 90-92 | ≥92 |
| Flexural Strength (MPa) | 250-280 | 280-350 | 300-380 | 350-420 | 400-450 |
| Compressive Strength (MPa) | 1500-1700 | 1800-2200 | 2000-2500 | 2300-2800 | 2500-3000 |
| Parameter | Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
|---|---|---|---|---|
| Max. service temperature (℃) |
1600-1700 | 1700-1800 | 1750-1850 | 1800-1900 |
| Thermal conductivity (W/m·K) | 15-20 | 20-25 | 25-30 | 30-35 |
| Thermal expansion coefficient (×10⁻⁶/℃) | 7.5-8.5 | 7.0-8.0 | 6.5-7.5 | 6.0-7.0 |
| Parameter | Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
|---|---|---|---|---|
| Acid resistance (HCl, 20%) | Excellent | Excellent | Excellent | Excellent |
| Alkali resistance (NaOH, 20%) | Good (slight corrosion possible with long-term exposure) | Excellent | Excellent | Excellent |
| Impurity content (ppm) | Fe₂O₃≤1000 SiO₂≤3000 |
Fe₂O₃≤500 SiO₂≤800 |
Fe₂O₃≤200 SiO₂≤300 |
Fe₂O₃≤100 SiO₂≤100 |
| Parameter | Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
Alumina Ceramic |
|---|---|---|---|---|
| Dielectric constant (ε) | 9-10 | 9.5-10.5 | 10-11 | 10.5-11.5 |
| Dielectric loss (tanδ) | ≤5×10⁻⁴ | ≤3×10⁻⁴ | ≤2×10⁻⁴ | ≤1×10⁻⁴ |
Typical Applications
95% Alumina Ceramic
Wear Protection & Structural Parts
- Mechanical seals
- Wear liners
- Wear elbows
- Wear-resistant tees
- Ceramic lined steel pipelines
99% Alumina Ceramic
Chemical & Precision Parts
- High-temperature furnace components
- Precision bearings
- Corrosion-resistant chemical pipelines
- Ceramic parts for mechanical mills and jet mills
99.5% / 99.7% Alumina Ceramic
Semiconductor & Electronics
- Semiconductor wafers
- Ceramic components for etching equipment