Hexagonal Boron Nitride vs. Silicon Nitride
Both hexagonal boron nitride and silicon nitride are non-oxide engineering ceramics. There are 15 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is hexagonal boron nitride and the bottom bar is silicon nitride.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 21 to 250 | |
| 600 to 2950 |
| Elastic (Young's, Tensile) Modulus, GPa | 14 to 60 | |
| 140 to 310 |
| Flexural Strength, MPa | 18 to 140 | |
| 130 to 810 |
| Poisson's Ratio | 0.11 | |
| 0.24 to 0.27 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1030 to 2350 | |
| 1000 to 1330 |
| Specific Heat Capacity, J/kg-K | 840 to 1610 | |
| 720 to 800 |
| Thermal Conductivity, W/m-K | 29 to 96 | |
| 12 to 31 |
| Thermal Expansion, µm/m-K | 0.54 to 18 | |
| 2.5 to 3.2 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 4.0 to 4.4 | |
| 8.0 to 10 |
| Dielectric Strength (Breakdown Potential), kV/mm | 61 to 200 | |
| 18 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 13 to 15 | |
| 11 to 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.9 to 2.1 | |
| 2.2 to 3.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.1 to 18 | |
| 34 to 53 |
| Stiffness to Weight: Bending, points | 42 to 69 | |
| 65 to 78 |
| Thermal Diffusivity, mm2/s | 9.9 to 34 | |
| 7.5 to 13 |