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 | |
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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 |