Silicon Carbide vs. Aluminum Nitride
Both silicon carbide and aluminum nitride are non-oxide engineering ceramics. There are 16 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is silicon carbide and the bottom bar is aluminum nitride.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2780 to 3900 | |
| 2100 |
| Elastic (Young's, Tensile) Modulus, GPa | 370 to 490 | |
| 330 |
| Flexural Strength, MPa | 410 to 600 | |
| 190 to 400 |
| Fracture Toughness, MPa-m1/2 | 3.4 to 4.6 | |
| 2.9 |
| Knoop Hardness | 2500 to 2900 | |
| 1160 |
| Poisson's Ratio | 0.14 to 0.21 | |
| 0.21 to 0.31 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 500 to 1590 | |
| 1380 |
| Maximum Thermal Shock, °C | 210 to 660 | |
| 220 |
| Specific Heat Capacity, J/kg-K | 670 to 1180 | |
| 780 |
| Thermal Conductivity, W/m-K | 120 to 170 | |
| 80 to 190 |
| Thermal Expansion, µm/m-K | 4.0 to 4.5 | |
| 4.2 to 5.4 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 0.94 to 3.3 | |
| 10 to 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.0 to 3.2 | |
| 2.9 to 3.3 |
Common Calculations
| Stiffness to Weight: Axial, points | 69 to 84 | |
| 55 to 63 |
| Stiffness to Weight: Bending, points | 79 to 82 | |
| 69 to 80 |
| Thermal Diffusivity, mm2/s | 38 to 79 | |
| 31 to 74 |