Aluminum Nitride vs. Mullite
Aluminum nitride belongs to the non-oxide engineering ceramics classification, while mullite belongs to the oxide-based engineering ceramics. There are 19 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is aluminum nitride and the bottom bar is mullite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 2100 | |
| 800 |
| Elastic (Young's, Tensile) Modulus, GPa | 330 | |
| 110 to 170 |
| Flexural Strength, MPa | 190 to 400 | |
| 130 to 160 |
| Fracture Toughness, MPa-m1/2 | 2.9 | |
| 2.0 |
| Knoop Hardness | 1160 | |
| 750 |
| Poisson's Ratio | 0.21 to 0.31 | |
| 0.25 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1380 | |
| 1680 |
| Maximum Thermal Shock, °C | 220 | |
| 170 to 230 |
| Specific Heat Capacity, J/kg-K | 780 | |
| 950 |
| Thermal Conductivity, W/m-K | 80 to 190 | |
| 3.5 to 11 |
| Thermal Expansion, µm/m-K | 4.2 to 5.4 | |
| 5.8 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.9 to 28 | |
| 6.3 |
| Dielectric Strength (Breakdown Potential), kV/mm | 15 to 56 | |
| 16 to 17 |
| Electrical Dissipation At 1 MHz | 0.00020 to 0.0010 | |
| 0.0025 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 10 to 12 | |
| 10 to 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.9 to 3.3 | |
| 2.7 to 3.0 |
Common Calculations
| Stiffness to Weight: Axial, points | 55 to 63 | |
| 22 to 31 |
| Stiffness to Weight: Bending, points | 69 to 80 | |
| 58 to 62 |
| Thermal Diffusivity, mm2/s | 31 to 74 | |
| 1.4 to 3.7 |