Mysterious relationship between CF content and electrical conductivity of carbon fiber reinforced polyetheretherketone

Carbon Fiber Reinforced Polyetheretherketone Performance and Application Areas

In the development of carbon fiber, our common thermosetting carbon fiber can no longer meet the demand, thermosetting carbon fiber product performance advantages performance is very good, but in the environmental protection and recyclable above did not achieve very good success, which also derived from the thermoplastic carbon fiber products, thermoplastic carbon fiber products in the performance of more eye-catching carbon fiber reinforced polyether ether ether ketone composite materials, that carbon fiber reinforced polyether ether ketone performance can reach 5 times the performance of metal, but the quality is only one-third of the metal, compared with similar carbon fiber products performance is also increased by 10%. Polyether ether ether ketone performance can reach 5 times the performance of metal, but the quality is only one-third of the metal, than the performance of similar carbon fiber products also enhance 10%.

Carbon fiber reinforced polyether ether ketone products performance of the four major advantages of performance

High temperature resistance, carbon fiber reinforced polyether ether ketone has very good high temperature resistance, in a high temperature environment, but also can show excellent product stability performance, carbon fiber reinforced polyether ether ketone high temperature melting point.

High tensile strength, carbon fiber reinforced polyether ether ketone has high tensile strength, in some special product performance requirements, when we enhance the carbon fiber polyether ether ketone CF content of 30%, the tensile strength can be increased by about 2.4 times, unlike pure polyether ether ketone there is a slow period of deformation, but to reach the maximum tensile strength and then directly after the fracture.

Corrosion resistance, thermoplastic carbon fiber reinforced polyether ether ether ketone products inherited the thermoset carbon fiber corrosion resistance, can be in low temperature and harsh environments, to ensure the stability of the product performance, and the use of a long period of time, in special environments, carbon fiber reinforced polyether ether ether ketone can greatly save us money, unlike traditional metal materials often corrode and lead to the need to go to harsh environments to replace.

Environmental protection can be recycled, thermoplastic carbon fiber and thermosetting carbon fiber comparison will be better found in thermoplastic carbon fiber can achieve environmental performance requirements, and can be very good recycling, that is, we can reach a certain temperature after dissolution after secondary molding.

Carbon fiber reinforced polyether ether ketone products three major application areas

Medical device field: in the field of medical devices, carbon fiber reinforced polyether ether ketone is very widely used in a field, that is because carbon fiber reinforced polyether ether ketone is in fact the combination of the PEEK material and carbon fiber, peek material can achieve skin-friendly effect, in the field of medical devices can be better and biocompatible, so medical devices in the prosthetic limb of the high-end products you will find that the Carbon fiber reinforced polyether ether ketone products. Not simply prosthetic limbs, in fact, many medical orthopedic devices are also used in the production of carbon fiber reinforced polyether ether ether ketone.

Automotive field: automotive lightweight in the thermosetting carbon fiber has been able to achieve above, very good to reduce energy consumption, improve the power performance. That car is no longer a luxury, we are buying a car, there are many people will take into account the interior, the interior using carbon fiber products, that is certainly to use food-grade carbon fiber reinforced polyether ether ether ketone, and thermoplastic carbon fiber reinforced polyether ether ether ketone in the automotive manufacturing by virtue of the density of the small, good performance and convenient process advantages, which is better to outlaw the use of steel.

Electronic and electrical fields: carbon fiber reinforced polyether ether ketone in the high-pressure, high temperature, and high humidity environment, the stability of the product can maintain excellent, that for special industries in the field of electronic and electrical appliances, more is the need for insulation, when we add insulating materials in carbon fiber reinforced polyether ether ketone to better ensure its insulation, that in the field of electronic and electrical appliances are well used up.

Carbon fiber content in carbon fiber reinforced PEEK composites has a significant impact on material properties. Not only the bonding properties with PEEK resin, but also the electrical conductivity of PEEK composites have a great influence. The volume resistivity and coefficient of friction for different carbon fiber contents are as follows:

PEEK Resin

1.The properties of PEEK resin

the volume resistance of PEEK resin is around 10^14(Ω.m), and the coefficient of friction is about 0.48. It has relatively low electrical conductivity, but has good wear resistance and friction properties.

2.Add %5 carbon fiber PEEK composite materials

When adding 5% carbon fibers to the PEEK resin, the volume resistance stays around 10^14(Ω.m) and the coefficient of friction is still about 0.48. This means that adding a small amount of carbon fibers does not have much effect on the electrical conductivity and friction properties of PEEK composites.

3.PEEK composites with %10 carbon fibers added

As the carbon fiber content increases to 10%, the volume resistance decreases to about 10^6 (Ω.m), and the coefficient of friction is still about 0.48. This indicates that adding more carbon fibers reduces the electrical resistance of the PEEK composites, but the coefficient of friction does not decrease significantly.

4.Add %15 carbon fiber PEEK composites

When the carbon fiber content increased to 15%, the volume resistance further decreased to about 850 (Ω.m), the coefficient of friction is still about 0.48. At this time, the carbon fiber content of the resistance reduction reached a peak, continue to increase the carbon fiber content of the resistance reduction effect is no longer obvious.

5.PEEK composites with %20 carbon fiber added

Finally, when the carbon fiber content was increased to 20%, the volume resistance was approximately 820 (Ω.m) and the coefficient of friction was still approximately 0.48. This implies that continuing to increase the carbon fiber content had a limited effect on the reduction of the resistance and did not have a significant effect on the coefficient of friction.

Overall, as the carbon fiber content continues to increase, the volume resistance and coefficient of friction gradually decreases, the carbon fiber content of 15% reached an extreme value of the volume resistance, continue to increase the carbon fiber content on the improvement of electrical conductivity contribution is relatively small. This is mainly because the carbon fiber and PEEK resin has a good combination of PEEK resin covered with carbon fiber makes it difficult to form a conductive pathway between carbon fibers, only a small part of the carbon fiber for the conductive properties of the composite material has contributed. Therefore, when choosing the carbon fiber content, you need to weigh the actual application needs and performance requirements.

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