LFT-G aerospace PEEK high strength and rigidity injection molded pellets

PEEK introduce

PEEK can also be called polyether ether ketone, as a high-performance semi-crystalline plastics, such plastics have excellent chemical resistance, mechanical strength, dimensional stability and a series of good performance, according to the performance is divided into a variety of series of materials, the most common classification of PEEK materials are PEEK pure material, glass fiber or carbon fiber modification.

PEEK Pure Material
We can see that with an elongation at break of 15%, PEEK Pure, despite its high toughness, has a modulus of elasticity of only 4,200mpa, the lowest in the family of plastics. This relatively low modulus means that PEEK pure is 'softer' and less abrasion resistant than other PEEK modifiers. Therefore, if you are using PEEK pure in frictional working conditions, be aware of material loss due to wear of the material.

PEEK filling Long Carbon Fiber Material

PEEK LCF30 is a 30% longer carbon fiber filled plastic based on PEEK pure material, the carbon fibers increase the modulus compared to PEEK pure material while maintaining maximum toughness of the material PEEK CF30 is a material that maintains a very high level of stiffness and relatively high toughness. In addition, long carbon fiber modified PEEK exhibits excellent wear resistance and very good friction properties. PEEK LCF30 has better wear resistance compared to PEEK LGF30. Long carbon fibers conduct heat more efficiently. PEEK LCF30 is therefore suitable for sliding applications. Like PEEK pure resins, PEEK LCF30 has excellent hydrolysis resistance in steam and boiling water.

The difference between LCF and SCF

Staple fiber can also be called cut section fiber, staple fiber is obtained mainly by cutting off the chemical long fibers into a section of short fibers, so that the fibers formed are about the same length as natural fibers. Under normal circumstances, between 35-150 mm is called the length of staple fiber.

In the composite material made of fiber is cut or pulled, the fiber is pulled from the matrix, such a pulling process is conducive to the absorption of energy provided by the loading, in a certain length range of the fiber, the longer the fiber, the greater the absorption of energy, and its strength is also more significant. And in the same volume amount, due to the longer the single fiber, the fewer the number of fiber roots, the less stress concentration generated at the fiber end, the more difficult the destruction of the material. From the results of the feedback of practical applications, the long carbon fiber reinforced thermoplastic composites of 6mm-24mm have more excellent various properties than the short fibers.

In addition, carbon fiber reinforced composites in the friction process, the fiber body plays an important role in lubrication, long distance carbon fiber can be much more sustainable, stable lubrication, so the coefficient of friction is lower, less wear, and the formation of finer abrasive debris. Due to such advantages, long carbon fiber reinforced thermoplastic composites are not afraid of high frequencies and loads, and perform much better in practical applications.

Application of PEEK-LCF materials