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High-alumina Refractory vs. Zirconia

Both high-alumina refractory and zirconia are oxide-based engineering ceramics. There are 8 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 high-alumina refractory and the bottom bar is zirconia.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.1
5.7 to 6.0
Flexural Strength, MPa 28
630 to 970
Maximum Temperature: Mechanical, °C 1200
500 to 1330
Maximum Thermal Shock, °C 210
300 to 350
Specific Heat Capacity, J/kg-K 800
400 to 510
Thermal Conductivity, W/m-K 1.5
2.2 to 4.3
Thermal Diffusivity, mm2/s 0.87
0.73 to 1.8
Thermal Expansion, µm/m-K 4.3
8.8 to 9.5