Ferrite vs. Alumina
Both ferrite and alumina are oxide-based engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is ferrite and the bottom bar is alumina.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 430 to 2000 | |
| 1920 to 2750 |
| Elastic (Young's, Tensile) Modulus, GPa | 120 to 140 | |
| 220 to 370 |
| Flexural Strength, MPa | 120 to 150 | |
| 260 to 430 |
| Fracture Toughness, MPa-m1/2 | 1.4 to 1.5 | |
| 3.7 to 7.2 |
| Knoop Hardness | 630 to 700 | |
| 960 to 1660 |
| Tensile Strength: Ultimate (UTS), MPa | 48 to 71 | |
| 210 to 290 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 710 to 1050 | |
| 870 to 940 |
| Thermal Conductivity, W/m-K | 3.9 to 6.3 | |
| 14 to 30 |
| Thermal Expansion, µm/m-K | 8.0 to 9.3 | |
| 6.7 to 8.2 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 12 to 270 | |
| 7.8 to 11 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 1.0 to 1.5 | |
| 6.2 to 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.7 to 4.8 | |
| 3.4 to 4.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 to 16 | |
| 35 to 53 |
| Stiffness to Weight: Bending, points | 35 to 36 | |
| 57 to 62 |
| Strength to Weight: Axial, points | 2.8 to 4.1 | |
| 14 to 23 |
| Strength to Weight: Bending, points | 6.2 to 8.0 | |
| 19 to 28 |
| Thermal Diffusivity, mm2/s | 0.78 to 1.9 | |
| 3.7 to 10 |
| Thermal Shock Resistance, points | 3.0 to 4.6 | |
| 4.9 to 14 |