Alpha Quartz vs. Alumina
Alpha quartz belongs to the non-glass optical ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.
For each property being compared, the top bar is alpha quartz and the bottom bar is alumina.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 91 | |
| 220 to 370 |
| Knoop Hardness | 740 | |
| 960 to 1660 |
| Poisson's Ratio | 0.13 | |
| 0.22 to 0.24 |
Thermal Properties
| Melting Onset (Solidus), °C | 1590 | |
| 2040 |
| Specific Heat Capacity, J/kg-K | 720 | |
| 870 to 940 |
| Thermal Conductivity, W/m-K | 8.5 | |
| 14 to 30 |
| Thermal Expansion, µm/m-K | 9.5 | |
| 6.7 to 8.2 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.7 | |
| 3.4 to 4.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 19 | |
| 35 to 53 |
| Stiffness to Weight: Bending, points | 57 | |
| 57 to 62 |
| Thermal Diffusivity, mm2/s | 4.4 | |
| 3.7 to 10 |