Carbon-carbon vs. Ductile Cast Iron
Carbon-carbon and ductile cast iron belong to fundamentally different material chemistries. Carbon-carbon is a ceramic material, while ductile cast iron 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 (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 ductile cast iron.
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 95 | |
| 170 to 180 |
| Poisson's Ratio | 0.32 | |
| 0.28 to 0.31 |
| Shear Modulus, GPa | 36 | |
| 64 to 70 |
| Tensile Strength: Ultimate (UTS), MPa | 19 | |
| 460 to 920 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 2400 | |
| 290 |
| Specific Heat Capacity, J/kg-K | 760 | |
| 490 |
| Thermal Conductivity, W/m-K | 40 | |
| 31 to 36 |
| Thermal Expansion, µm/m-K | 4.0 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 0.090 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 0.48 | |
| 8.8 to 9.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.7 | |
| 7.1 to 7.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 31 | |
| 12 to 14 |
| Stiffness to Weight: Bending, points | 89 | |
| 24 to 26 |
| Strength to Weight: Axial, points | 3.0 | |
| 17 to 35 |
| Strength to Weight: Bending, points | 9.1 | |
| 18 to 29 |
| Thermal Diffusivity, mm2/s | 31 | |
| 8.9 to 10 |
| Thermal Shock Resistance, points | 3.5 | |
| 17 to 35 |