Hot Pressed Boron Carbide vs. Hot Pressed Silicon Nitride
Both hot pressed boron carbide and hot pressed silicon nitride are non-oxide engineering ceramics. Both are furnished in the hot isostatic pressed (HIP) condition. There are 20 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is hot pressed boron carbide and the bottom bar is hot pressed silicon nitride.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2200 | |
| 2810 |
| Elastic (Young's, Tensile) Modulus, GPa | 460 | |
| 310 |
| Flexural Strength, MPa | 410 | |
| 810 |
| Fracture Toughness, MPa-m1/2 | 2.5 | |
| 6.2 |
| Knoop Hardness | 3200 | |
| 1570 |
| Poisson's Ratio | 0.17 | |
| 0.27 |
| Tensile Strength: Ultimate (UTS), MPa | 350 | |
| 510 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 2000 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 950 | |
| 720 |
| Thermal Conductivity, W/m-K | 90 | |
| 31 |
| Thermal Expansion, µm/m-K | 5.6 | |
| 3.2 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.4 | |
| 8.2 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 0 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.5 | |
| 3.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 100 | |
| 53 |
| Stiffness to Weight: Bending, points | 100 | |
| 69 |
| Strength to Weight: Axial, points | 39 | |
| 44 |
| Strength to Weight: Bending, points | 44 | |
| 44 |
| Thermal Diffusivity, mm2/s | 38 | |
| 13 |
| Thermal Shock Resistance, points | 9.7 | |
| 37 |