Alumina Oxide (Al2O3) Ceramics is the most widely used fine ceramics material. This material has superb material characteristics such as high electrical insulation, high mechanical strength, high wear and chemical resistance.
Ortech provides state-of-the-art technical alumina ceramics manufacturing by the most cost-effective processes. Ortech maintains efficient manufacturing facilities that support quick-turn prototype development and high volume production.
| Alumina 96% | Alumina 99.5% | ||
|---|---|---|---|
| Density g/cm3 | 3.72 | 3.90 | |
| Crystal Size (Average) Average Microns | 6 | 6 | |
| Water Absorption % | 0 | 0 | |
| Gas Permeability – | 0 | 0 | |
| Color – | White | Ivory | |
| Flexural Strength (MOR) 20° C MPa (psi x 103) | 358 (52) | 379 (55) | |
| Elastic Modulus 20° C GPa (psi x 106) | 303 (44) | 370 (54) | |
| Poisson’s Ratio 20° C – | 0.21 | 0.22 | |
| Compressive Strength 20° C MPa (psi x 103) | 2068 (300) | 2600 (377) | |
| Hardness Rockwell R45N | 78 | 83 | |
| Tensile Strength 25° C MPa (psi x 103) | 221 (32) | 262 (38) | |
| Fracture Toughness K(I c) MPam1/2 | 4-5 | 4-5 | |
| Thermal Conductivity 20° C W/m K | 24.7 | 30.0 | |
| Coefficient of Thermal Expansion 25-1000° C 1X 10-6/°C | 8.2 | 8.2 | |
| Specific Heat 100° C J/kg*K | 880 | 880 | |
| Thermal Shock Resistance Δ Tc °C | 250 | 200 | |
| Dielectric Strength 6.35mm ac-kV/mm (ac V/mil) | 8.3 (210) | 8.7 (220) | |
| Dielectric Constant 1 MHz 25° C | 9 | 9.7 | |
| Dielectric Loss (tan delta) 1 MHz 25° C | 0.0002 | 0.0001 | |
| Volume Resistivity 25° C ohm-cm | > 10 14 | > 10 14 | |
| Volume Resistivity 500° C ohm-cm | 4 x 10 9 | 2 x 10 10 | |
| Volume Resistivity 1000° C ohm-cm | 1 x 10 6 | 2 x 10 6 | |
| Maximum Use Temperature | 1700 C | 1750 C |
