Alumina vs. Grade 20 Titanium
Alumina and grade 20 titanium belong to fundamentally different material chemistries. Alumina is a ceramic material, while grade 20 titanium is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 13 material properties with values for both materials. Properties with values for just one material (26, in this case) are not shown.
For each property being compared, the top bar is alumina and the bottom bar is grade 20 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 120 |
| Poisson's Ratio | 0.22 to 0.24 | |
| 0.32 |
| Tensile Strength: Ultimate (UTS), MPa | 210 to 290 | |
| 900 to 1270 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 650 to 1730 | |
| 370 |
| Melting Onset (Solidus), °C | 2040 | |
| 1600 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 520 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 9.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 5.0 |
Common Calculations
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 14 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 33 |
| Strength to Weight: Axial, points | 14 to 23 | |
| 50 to 70 |
| Strength to Weight: Bending, points | 19 to 28 | |
| 41 to 52 |
| Thermal Shock Resistance, points | 4.9 to 14 | |
| 55 to 77 |