Alumina Oxide Material Properties
Alumina Oxide (Al2O3), also known as Alumina, is a widely used engineering ceramic due to its high performance at a cost effective price. Generally white or creamy beige, it is available in various levels of purity. Properties include high levels of mechanical strength, compressive strength, hardness, corrosion & wear resistance. Performance characteristics include low dielectric constant and low thermal expansion. It is chemically inert and biocompatible. Alumina is a good selection for high temperature or corrosive environments and high wear applications.
Applications for precision balls include: bearings, check valves, pumps, gauges, flow meters, medical devices, metrology instrumentation
Alumina Oxide
| PHYSICAL PROPERTIES | |
|---|---|
| chemical composition | >99.9% Al2O3 |
| crystalline structure | corundum |
| density | 3.90 g/cm3 |
| porosity | 0 |
| MECHANICAL PROPERTIES | |
| hardness at 20°C | 15.7 GPa |
| Young’s modulus | 365 GPa |
| Poisson’s ratio | 0.25 |
| tensile strength | 200 – 250 N/mm2 |
| bending strength | 200 – 600 N/mm2 |
| compressive strength | 1900 – 2000 N/mm2 |
| fracture toughness | 4 – 5 MPa.m |
| THERMAL PROPERTIES | |
| thermal conductivity | 40 W/m.K at 20°C |
| thermal shock resistance | 200°C |
| melting point | 2050°C |
| specific heat | 930 J/kg.K (at 100°) |
| ELECTRICAL PROPERTIES | |
| electrical resistivity | 1012 Ω.cm at 20°C |
| 108 Ω.cm at 500°C | |
| dielectric strength | 1 x 104 KV/m |
| dielectric constant | 10.0, 1MHz |
