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Carbon Fibre Reinforced Carbon Composites
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Carbon fibre-reinforced carbon or graphite is a high strength composite material consisting of a carbon matrix and reinforcing carbon fibres.
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Typical physical properties of CFRC
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| Bulk density |
g/cm³
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1.4 - 1.45
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| Bending strength |
N/mm²
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210 - 250
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| Dynamic E modulus |
kN/mm²
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60 - 65
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| Tensile strength |
N/mm²
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260 - 330
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| Electrical resistance at 20ºC, parallel to the direction of the fibre |
ohms
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25 - 30
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| Interiaminar shear strength |
N/mm²
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9 - 12
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| Ash content |
%
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0.08
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Carbon fibre fabric and carbon rovings are impregnated with pitch or resins and are then laminated into sheets or wound into cylinders. Custom shapes can also be fabricated. These are then cured and carbonized. CFRC materials for high temperature applications are usually processed at a temperature of 2000ºC before machining and graphitized at approximately 2900ºC. The physical properties of CFRC can be varied as required by the choice of type, content and orientation of the fibres, the lamination process, the secondary compression, and the baking and graphitizing temperatures.
This carbon composite, together with the light, high strength and rigid carbon fibres has all the virtues of graphite but is much less dense and has considerably higher strength and rigidity.
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| Support frame for heat treating turbine blades (1300ºc) constructed from CRFC / Graphite |
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Characteristics properties of CFRC
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| High strength parallel to the direction of the fibre laminates |
Low thermal conductivity perpendicular to the direction of the fibre laminates |
| Low bulk density |
Corrosion resistant |
| High resistance to thermal shock |
High chemical purity |
| Thermally stable at temperatures in excess of 2000ºC |
Pseudoplastic fracture behaviour, high laminar shear |
| Low thermal expansion |
High bending fatigue strength |
| Electrically conductive |
Practically no creep behaviour up to 2000ºC |
| Anisotropic |
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| CFRC is available in the following forms:
Sheet ( Max dimensions 2000mm x 1000mm, thickness ranges from 0.7mm to 100mm )
Cylinders. ( 200mm dia x 2000mm length )
Angles and Channels in various profiles and thicknesses up to 2000mm long.
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