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News
2023-09-12
Alumina in its various degrees of purity is a versatile material that offers a combination of good mechanical and electrical properties and probably the most important oxide ceramic for widely varying technical applications. Depending on the alumina purity, particular the purity ranging from 95% to >99.7%, these aluminum oxide ceramics have variety of properties:
* Good mechanical strength
* Good heat conductivity
* Good fire resistance
* Good corrosion and wear resistance
* Good sliding properties
* Very good electric insulation
It is suitable for a wide range of applications including seal rings, laser tubes, electrical insulators, threadguides, refractory devices, electronic substrates, thermocouple tubes, grinding media and wear components. It has a good strength and stiffness, very high hardness and resistance to wear. In addition it can be readily joined to metals or other ceramics using specially developed metallising and brazing techniques.
| Properties of Alumina ceramics (Al2O3) | |||||
| Property | Item | Data | Unit | ||
| 99.8% alumina | 99% alumina | 95% alumina | |||
| Mechanical Characteristics | Color | Ivory | Light yellow | White |
|
| Density | 3.93 | 3.85 | 3.7 | g/cm3 | |
| Bending Strength | 370 | 310 | 300 | MPa | |
| Compressive strength | 2,500 | 2,400 | 2,300 | MPa | |
| Elastic Modulus | 390 | 340 | 320 | GPa | |
| Fracture Toughness | 4 | 3~4 | 3~4 | MPa m1/2 | |
| Weber Coefficient | 12 | 12 | 12 | m | |
| Vickers Hardness (HV 0.5) | 1,850 | 1,600 | 1,400 | MPa | |
| Thermal Characteristics | Coefficient of Line Thermal Expansion | 7~8 | 7~8 | 7~ 8 | 10-6 K-1 |
| Thermal Conductivity | 32 | 29 | 20 | W/mK | |
| Thermal Shock Resistance (Put in Water) | 280 | 200 | 250 | ∆T °C | |
| Max Working Temperature | 1,750 | 1,600 | 1,500 | °C | |
| Electrical Characteristics | Volume Resistance at 20°C | >1014 | >1014 | >1014 | Ωcm |
| Dielectric Strength | 15×106 | 15×106 | 15×106 | V/m | |
| Dielectric Constant | 10 | 10 | 9 | εr | |
| Dielectric Loss Angle at 20°C (One MHz) | 0.0001 | 0.0002 | 0.0004 | tanδ | |
| Chemical Characteristics | Nitric Acid (60%) 90°C | 0.05 | 0.1 | 0.1 | WT Loss mg/cm2/day |
| Sulphuric Acid (95%) 95°C | 0.22 | 0.34 | 0.3 | ||
| Caustic Soda (30%) 80°C | 0.04 | 0.95 | 0.9 | ||
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.