Synthetic Sapphire vs. Titanium Diboride
Synthetic sapphire belongs to the oxide-based engineering ceramics classification, while titanium diboride belongs to the non-oxide engineering ceramics. There are 19 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is synthetic sapphire and the bottom bar is titanium diboride.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2700 | |
| 3540 |
| Elastic (Young's, Tensile) Modulus, GPa | 450 | |
| 290 |
| Flexural Strength, MPa | 1090 | |
| 380 |
| Fracture Toughness, MPa-m1/2 | 1.9 | |
| 6.5 |
| Knoop Hardness | 1860 | |
| 2800 |
| Poisson's Ratio | 0.28 | |
| 0.11 |
| Tensile Strength: Ultimate (UTS), MPa | 2470 | |
| 280 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 2000 | |
| 1270 |
| Specific Heat Capacity, J/kg-K | 760 | |
| 870 |
| Thermal Conductivity, W/m-K | 30 | |
| 58 |
| Thermal Expansion, µm/m-K | 5.3 | |
| 8.0 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 17 | |
| -6.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.0 | |
| 4.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 63 | |
| 35 |
| Stiffness to Weight: Bending, points | 64 | |
| 49 |
| Strength to Weight: Axial, points | 170 | |
| 17 |
| Strength to Weight: Bending, points | 100 | |
| 21 |
| Thermal Diffusivity, mm2/s | 9.9 | |
| 15 |
| Thermal Shock Resistance, points | 74 | |
| 8.7 |