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Carbon-carbon vs. Austempered Cast Iron

Carbon-carbon and austempered cast iron belong to fundamentally different material chemistries. Carbon-carbon is a ceramic material, while austempered cast iron is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 14 material properties with values for both materials. Properties with values for just one material (18, 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 carbon-carbon and the bottom bar is austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
180
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 36
62 to 69
Tensile Strength: Ultimate (UTS), MPa 19
860 to 1800

Thermal Properties

Specific Heat Capacity, J/kg-K 760
490
Thermal Conductivity, W/m-K 40
42
Thermal Expansion, µm/m-K 4.0
13

Otherwise Unclassified Properties

Density, g/cm3 1.7
7.5

Common Calculations

Stiffness to Weight: Axial, points 31
13
Stiffness to Weight: Bending, points 89
25
Strength to Weight: Axial, points 3.0
32 to 66
Strength to Weight: Bending, points 9.1
27 to 44
Thermal Diffusivity, mm2/s 31
11
Thermal Shock Resistance, points 3.5
25 to 53