Silicon Nitride vs. Calcium Fluoride
Silicon nitride belongs to the non-oxide engineering ceramics classification, while calcium fluoride belongs to the non-glass optical ceramics. There are 9 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is silicon nitride and the bottom bar is calcium fluoride.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 2.2 to 3.4 | |
| 3.2 |
| Elastic (Young's, Tensile) Modulus, GPa | 140 to 310 | |
| 80 |
| Poisson's Ratio | 0.24 to 0.27 | |
| 0.26 |
| Specific Heat Capacity, J/kg-K | 720 to 800 | |
| 860 |
| Stiffness to Weight: Axial, points | 34 to 53 | |
| 14 |
| Stiffness to Weight: Bending, points | 65 to 78 | |
| 45 |
| Thermal Conductivity, W/m-K | 12 to 31 | |
| 9.7 |
| Thermal Diffusivity, mm2/s | 7.5 to 13 | |
| 3.5 |
| Thermal Expansion, µm/m-K | 2.5 to 3.2 | |
| 19 |