Silicon Nitride vs. CVD Diamond
Both silicon nitride and CVD diamond are non-oxide engineering ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is silicon nitride and the bottom bar is CVD diamond.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 to 310 | |
| 1050 |
| Fracture Toughness, MPa-m1/2 | 3.1 to 6.2 | |
| 5.5 |
| Poisson's Ratio | 0.24 to 0.27 | |
| 0.1 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 720 to 800 | |
| 500 |
| Thermal Conductivity, W/m-K | 12 to 31 | |
| 1900 |
| Thermal Expansion, µm/m-K | 2.5 to 3.2 | |
| 1.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 8.0 to 10 | |
| 5.7 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 11 to 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 to 3.4 | |
| 3.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 34 to 53 | |
| 170 |
| Stiffness to Weight: Bending, points | 65 to 78 | |
| 96 |
| Thermal Diffusivity, mm2/s | 7.5 to 13 | |
| 1080 |