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Carbon-carbon vs. R30021 Cobalt

Carbon-carbon and R30021 cobalt belong to fundamentally different material chemistries. Carbon-carbon is a ceramic material, while R30021 cobalt is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 17 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 carbon-carbon and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 240
1300
Elastic (Young's, Tensile) Modulus, GPa 95
220
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 36
86
Tensile Strength: Ultimate (UTS), MPa 19
700

Thermal Properties

Specific Heat Capacity, J/kg-K 760
450
Thermal Conductivity, W/m-K 40
15
Thermal Expansion, µm/m-K 4.0
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 0.090
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 0.48
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4

Common Calculations

Stiffness to Weight: Axial, points 31
15
Stiffness to Weight: Bending, points 89
24
Strength to Weight: Axial, points 3.0
23
Strength to Weight: Bending, points 9.1
21
Thermal Diffusivity, mm2/s 31
3.8
Thermal Shock Resistance, points 3.5
21