Hot Pressed Silicon Carbide vs. Synthetic Sapphire
Hot pressed silicon carbide belongs to the non-oxide engineering ceramics classification, while synthetic sapphire belongs to the oxide-based engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is hot pressed silicon carbide and the bottom bar is synthetic sapphire.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2800 | |
| 2700 |
| Elastic (Young's, Tensile) Modulus, GPa | 490 | |
| 450 |
| Flexural Strength, MPa | 600 | |
| 1090 |
| Fracture Toughness, MPa-m1/2 | 4.6 | |
| 1.9 |
| Knoop Hardness | 2900 | |
| 1860 |
| Poisson's Ratio | 0.15 | |
| 0.28 |
| Tensile Strength: Ultimate (UTS), MPa | 370 | |
| 2470 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1500 | |
| 2000 |
| Specific Heat Capacity, J/kg-K | 690 | |
| 760 |
| Thermal Conductivity, W/m-K | 120 | |
| 30 |
| Thermal Expansion, µm/m-K | 4.4 | |
| 5.3 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 4.0 | |
| 9.9 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 3.0 | |
| 17 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.2 | |
| 4.0 |
Common Calculations
| Stiffness to Weight: Axial, points | 84 | |
| 63 |
| Stiffness to Weight: Bending, points | 82 | |
| 64 |
| Strength to Weight: Axial, points | 32 | |
| 170 |
| Strength to Weight: Bending, points | 35 | |
| 100 |
| Thermal Diffusivity, mm2/s | 55 | |
| 9.9 |
| Thermal Shock Resistance, points | 12 | |
| 74 |