ALUMINUM OXIDE (Al2O3) TECHNICAL DATA
Aluminum Oxide is a tough, hard material often referred to by a number of other names including, Alumina, and Corundum. With a Mohs hardness of 9, Aluminum Oxide is a high strength, wear-resistant material possessing a strong ability to resist vigorous chemical attacks (such as acid and alkali) at extreme temperatures. Its high degree of refractoriness, along with its superior electrical insulating properties, dielectric properties, and high melting point make Aluminum Oxide a desirable material choice for a diverse range of applications.
Aluminum Oxide Technical Data
| Properties | Units | Test | Value | |||
| Physical | ||||||
| Chemical Formula | - | - | Al2O3 | |||
| Density, r | g/cm3 | ASTM C20 | 3.21 | |||
| Color | - | - | ivory/white | |||
| Crystal Structure | - | - | hexagonal | |||
| Water Absorption | % @R.T. | ASTM C373 | 0.0 | |||
| Hardness | Mohs | - | 9 | |||
| Hardness | knoop (kg/mm2) | Knoop 100g | 2000 | |||
| Mechanical | ||||||
| Compressive Strength | MPa @ R.T. | ASTM C773 | 2070-2620 | |||
| Tensile Strength | MPa @ R.T. | ACMA Test #4 | 206-300 | |||
| Modulus of Elasticity (Young's Modulus) | GPa | ASTM C848 | 393 | |||
| Flexural Strength (MOR) | MPa @ R.T. | ASTM F417 | 310-379 | |||
| Poisson's Ratio, u | ASTM C818 | 0.27 | ||||
| Fracture Toughness, KIc | MPa x m1/2 | Notched Beam Test | 4.5 | |||
| Thermal | ||||||
| Max. Use Temperature (* denotes inert atm.) | ºC | No load cond. | 1750 | |||
| Thermal Shock Resistance | DT (ºC) | Quenching | 200 | |||
| Thermal Conductivity | W/m-K @ R.T. | ASTM C408 | 35 | |||
| Coefficient of Linear Thermal Expansion, al | mm/m-ºC (~25ºC through ±1000ºC) | ASTM C372 | 8.4 | |||
| Specific Heat, cp | cal/g-ºC @ R.T. | ASTM C351 | 0.21 | |||
| Electrical | ||||||
| Dielectric Constant | 1MHz @ R.T. | ASTM D150 | 9.6 | |||
| Dielectric Strength | kV/mm | ASTM D116 | 15 | |||
| Electrical Resistivity | Wcm @ R.T. | ASTM D1829 | >1014 | |||