Hafnia vs. Mullite

Both hafnia and mullite are oxide-based engineering ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (15, 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 mullite.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		9.7
Density, g/cm³		2.7 to 3.0

Elastic (Young's, Tensile) Modulus, GPa		57
Elastic (Young's, Tensile) Modulus, GPa		110 to 170

Electrical Resistivity Order of Magnitude, 10^x Ω-m		9.0
Electrical Resistivity Order of Magnitude, 10^x Ω-m		10 to 11

Maximum Temperature: Mechanical, °C		2800
Maximum Temperature: Mechanical, °C		1680

Specific Heat Capacity, J/kg-K		120
Specific Heat Capacity, J/kg-K		950

Stiffness to Weight: Axial, points		3.3
Stiffness to Weight: Axial, points		22 to 31

Stiffness to Weight: Bending, points		13
Stiffness to Weight: Bending, points		58 to 62

Thermal Conductivity, W/m-K		1.1
Thermal Conductivity, W/m-K		3.5 to 11

Thermal Diffusivity, mm²/s		0.95
Thermal Diffusivity, mm²/s		1.4 to 3.7

Thermal Expansion, µm/m-K		6.0
Thermal Expansion, µm/m-K		5.8

Hafnia vs. Mullite

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