Hafnia vs. High-alumina Refractory

Both hafnia and high-alumina refractory are oxide-based engineering ceramics. There are 6 material properties with values for both materials. Properties with values for just one material (7, 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 high-alumina refractory.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		9.7
Density, g/cm³		2.1

Maximum Temperature: Mechanical, °C		2800
Maximum Temperature: Mechanical, °C		1200

Specific Heat Capacity, J/kg-K		120
Specific Heat Capacity, J/kg-K		800

Thermal Conductivity, W/m-K		1.1
Thermal Conductivity, W/m-K		1.5

Thermal Diffusivity, mm²/s		0.95
Thermal Diffusivity, mm²/s		0.87

Thermal Expansion, µm/m-K		6.0
Thermal Expansion, µm/m-K		4.3

Hafnia vs. High-alumina Refractory

Material Properties

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