Comparison of physical properties of different ceramic materials.
| Aluminium Oxide | Zirconium Oxide | |
Colour | | White, Pink, Red, Ivory | Yellow Ochre |
Appearance | | Dense | Dense |
Main Use | | Thread Guides | Thread Guides |
Density | g cm-3 | 3.7 to 3.9 | 5.6 to 5.9 |
Water Absorption | % | Nil | Nil |
Maximum Service Temperature | oC | 1600 | 2000 |
Thermal Expansion Coefficient | x10-6K-1 | 5 to 8.3 | 10 |
Specific Gravity | | 3.8 | 5.8 |
Roughness Ra | x10-6m | 0.15 to 1.6 | 0.1 to 1.2 |
Bending Strength | MPa | 300 | 1300 |
Compressive Strength | MPa | 2400 | 3000 |
Modulus of Elasticity | GPa | 350 | 205 |
Vickers Hardness | kgf mm-2 | 1850 | 1150 |
Thermal Conductivity | Wm-1K-1 | 24 | 2 |
Thermal Shock Resistance | oC | 250 | 280 |
Dielectric Constant | | 10 | - |