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SiAlON vs. Hafnia

SiAlON belongs to the non-oxide engineering ceramics classification, while hafnia belongs to the oxide-based engineering ceramics. There are 10 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 SiAlON and the bottom bar is hafnia.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 3.3
9.7
Elastic (Young's, Tensile) Modulus, GPa 290
57
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
9.0
Maximum Temperature: Mechanical, °C 1200
2800
Specific Heat Capacity, J/kg-K 880
120
Stiffness to Weight: Axial, points 50
3.3
Stiffness to Weight: Bending, points 67
13
Thermal Conductivity, W/m-K 19
1.1
Thermal Diffusivity, mm2/s 6.4
0.95
Thermal Expansion, µm/m-K 3.6
6.0