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Carbon-carbon vs. R30075 Cobalt

Carbon-carbon and R30075 cobalt belong to fundamentally different material chemistries. Carbon-carbon is a ceramic material, while R30075 cobalt is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 16 material properties with values for both materials. Properties with values for just one material (16, 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 R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
210 to 250
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 36
82 to 98
Tensile Strength: Ultimate (UTS), MPa 19
780 to 1280

Thermal Properties

Specific Heat Capacity, J/kg-K 760
450
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 4.0
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 0.090
2.0
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
14 to 17
Stiffness to Weight: Bending, points 89
24 to 25
Strength to Weight: Axial, points 3.0
26 to 42
Strength to Weight: Bending, points 9.1
22 to 31
Thermal Diffusivity, mm2/s 31
3.5
Thermal Shock Resistance, points 3.5
21 to 29