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Carbon Carbon Composites. / advanced / capable / durable

Carbon Carbon Composites

Carbon Carbon CompositesCarbon fibre reinforced carbon composites, commonly referred to as Carbon Carbon Composites, CFC or C/C. It is an advanced material that is made of thin carbon fibres and a carbon matrix binder together it creates a composite of highly durable materials for high temperature and friction applications.

The basic manufacturing principles of C/C composite involves carbon fibres and a matrix going through several impregnation and heat treatment cycles. Once these steps are complete, graphitization is the final process and this leaves you with a C/C Composite material.

Carbon Carbon Composites are  the ideal solution for today’s fast moving high temperature environments and  heat-treatment industries. Carbon Carbon composites have high mechanical strength, thermal conductivity, prolonged life, are very light in weight. A great solution to many users due energy savings, increased productivity and an overall reduction in running costs.

Neftec’s Short-Fibre Carbon Carbon Composites

We specialise in Short-Fibre C/C, this is also known as chopped, random length and random weave CFC. The advantage of this type of composite over conventional plain woven Carbon Carbon is the higher Inter-laminar strength (ILS) it offers, far greater reduction in de-lamination and high density.

chopped ccNeftec’s Carbon Carbon Composites it’s usually referred to as a 2.5D Composite, it sits in-between plain woven 2D and 3D composites. In basic terms, it means it offers similar strength advantages of 3D Composites but with comparable cost on par with 2D Composites.

PM Method

We have developed our highly advanced manufacturing process called ‘PM’. The ‘PM Method’ allows us to produce exceptional high-strength composites with shorter production times. The key is to our highly developed Impregnation and heating cycles, due to these technical advancements we can reduce cycles in this process, while producing even higher quality C/C Composites. This helps us reduce post-production costs, allowing us to pass on these savings to our customers while at the same time helps keep a stable pricing structure. 

The Importance of Inter-laminar strength over Tensile strength

One of key parts to CFC structural strength is the Inter-laminar Sheer Strength or ILSS for short. ILSS is a measurement of the strength between each laminate.  A lower the ILSS leads to a greater risk of de-lamanition. A leading cause to CFC Composite components failing. Neftec are very keen to highlight of this measurement which is often overlooked. 

There is always an emphasis placed on tensile strength as being a critical property of CFC composite strength. However in most, if not all cases CFC failure it is down to de-lamination due to a low ILSS strength and not because the Tensile strength had been exceeded. Manufacturers really do not highlight the importance of this value and that is why Neftec is keen to educate the importance of ILSS, along with density and flexural strength data.

 

Key features over other Carbon Carbon Composites

Density

    • Superior Density. Our Carbon Composite offer exceptional life-spans and superior strength qualities.

Short Process

    • PM method, Neftec original technology. Dramatically cuts costs, production and lead times and with an increase in quality and strength.

Inter-laminar Strength

    • Neftec uses cut carbon fibre and random layup technique. This gives far greater inter-laminar strength compared to Graphite and Long-fibre. High ILSS decreases fractures and de-lamination.

Superior heat resistance

    • Compared to other Carbon composites. Neftec’s composites in the same environment can exhibit greater strength over prolonged periods of time. CFC can handle temperatures up to 2500°c

Technical Data

 

Material Grade

PC70

PC70H

Bulk Density g/cm3 1.7 1.7+
Flexural Strength MPa 200 TBA
Inter-laminar Shear Strength (ILSS) MPa 19 19+
Compressive Strength MPa 120 200+
Young’s Modulus GPa 45 TBA
Tensile Strength MPa 120 TBA
( RT-1300C ) 10-6/C 1.3 TBA
Coefficient of Thermal Expansion 10-6/C 10 TBA
Thermal Conductivity W/m・K 35 TBA
12 TBA
Specific Heat 20C J/Kg・K 720 TBA
Electrical Resistivity μΩcm 2800 2800
Sharpy Impact Strength KJ/m2 20  TBA
Shore Hardness 75  TBA
Temperature Rating  2000°c  2000°c

 

Material Grade

IC50

WL60

Bulk Density g/cm3 1.5 1.6
Flexural Strength MPa 100 100
Inter-laminar Shear Strength (ILSS) MPa 10 11
Compressive Strength MPa 100 TBA
Young’s Modulus GPa 55 65
Tensile Strength MPa 100 200
( RT-1300C ) 10-6/C 1.1 1.1
Coefficient of Thermal Expansion 10-6/C 19 9
Thermal Conductivity W/m・K 32 33
10 10
Specific Heat 20C J/Kg・K TBA  TBA
Electrical Resistivity μΩcm NA 2800
Charpy Impact Strength KJ/m2  TBA  TBA
Temperature Rating  Celcius  2000°c  2000°c

Carbon/Carbon Composites VS other commonly used High-temperature materials

Advantages over Graphite

    • Higher strength and structural rigidity
    • Higher resistance to fracture
    • CFC structures and fixtures can be made smaller
    • Low Thermal Expansion

Advantages over Ceramic

    • Higher resistance to fracture
    • Higher resistance to thermal shock
    • Can be machined into complex shapes
    • Carbon Composites do not bond

Advantages over Metal

    • Can endure very high temperatures – up to 2500ºC (4500ºF)
    • Lighter in weight – Carbon Composites weigh 1/5th of iron
    • Highly resistant to corrosion and radiation
    • Thermal expansion is far lower in Carbon Composites

Advantages over plastic

    • Can endure very high temperatures – up to 2500ºC (4500ºF)
    • Highly resistant to corrosion and radiation
    • Extremely high wear resistance
    • Thermal expansion is far lower in Carbon Composites