Yttria vs. Fused Silica
Yttria belongs to the oxide-based engineering ceramics classification, while fused silica belongs to the glass and glass-ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is yttria and the bottom bar is fused silica.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 390 | |
| 1100 |
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 73 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 2000 | |
| 1080 |
| Melting Onset (Solidus), °C | 2440 | |
| 1900 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 720 |
| Thermal Conductivity, W/m-K | 0.3 | |
| 1.4 |
| Thermal Expansion, µm/m-K | 8.0 | |
| 0.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 5.0 | |
| 2.2 |
| Light Transmission Range, µm | 0.3 to 12 | |
| 0.16 to 3.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 18 |
| Stiffness to Weight: Bending, points | 32 | |
| 63 |
| Thermal Diffusivity, mm2/s | 0.14 | |
| 0.85 |