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Hafnia vs. Synthetic Sapphire

Both hafnia and synthetic sapphire are oxide-based engineering ceramics. There are 11 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 hafnia and the bottom bar is synthetic sapphire.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 57
450

Thermal Properties

Maximum Temperature: Mechanical, °C 2800
2000
Melting Onset (Solidus), °C 2900
2050
Specific Heat Capacity, J/kg-K 120
760
Thermal Conductivity, W/m-K 1.1
30
Thermal Expansion, µm/m-K 6.0
5.3

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 9.0
17

Otherwise Unclassified Properties

Density, g/cm3 9.7
4.0

Common Calculations

Stiffness to Weight: Axial, points 3.3
63
Stiffness to Weight: Bending, points 13
64
Thermal Diffusivity, mm2/s 0.95
9.9