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Carbon-carbon vs. G-CoCr28 Cobalt

Carbon-carbon and G-CoCr28 cobalt belong to fundamentally different material chemistries. Carbon-carbon is a ceramic material, while G-CoCr28 cobalt is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 material properties with values for both materials. Properties with values for just one material (17, 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 G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
210
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 36
83
Tensile Strength: Ultimate (UTS), MPa 19
560

Thermal Properties

Maximum Temperature: Mechanical, °C 2400
1200
Specific Heat Capacity, J/kg-K 760
470
Thermal Conductivity, W/m-K 40
8.5
Thermal Expansion, µm/m-K 4.0
14

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.1

Common Calculations

Stiffness to Weight: Axial, points 31
15
Stiffness to Weight: Bending, points 89
24
Strength to Weight: Axial, points 3.0
19
Strength to Weight: Bending, points 9.1
19
Thermal Diffusivity, mm2/s 31
2.2
Thermal Shock Resistance, points 3.5
14