Alumina vs. Ferrite
Both alumina and ferrite 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 alumina and the bottom bar is ferrite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1920 to 2750 | |
| 430 to 2000 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 120 to 140 |
| Flexural Strength, MPa | 260 to 430 | |
| 120 to 150 |
| Fracture Toughness, MPa-m1/2 | 3.7 to 7.2 | |
| 1.4 to 1.5 |
| Knoop Hardness | 960 to 1660 | |
| 630 to 700 |
| Tensile Strength: Ultimate (UTS), MPa | 210 to 290 | |
| 48 to 71 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 710 to 1050 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 3.9 to 6.3 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 8.0 to 9.3 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 7.8 to 11 | |
| 12 to 270 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 6.2 to 14 | |
| 1.0 to 1.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 4.7 to 4.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 15 to 16 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 35 to 36 |
| Strength to Weight: Axial, points | 14 to 23 | |
| 2.8 to 4.1 |
| Strength to Weight: Bending, points | 19 to 28 | |
| 6.2 to 8.0 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 0.78 to 1.9 |
| Thermal Shock Resistance, points | 4.9 to 14 | |
| 3.0 to 4.6 |