Mullite vs. Hafnia

Both mullite and hafnia 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 mullite and the bottom bar is hafnia.

Metric UnitsUS Customary Units

Material Properties

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

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

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

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

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

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

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

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

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

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

Mullite vs. Hafnia

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