Views: 5 Author: Site Editor Publish Time: 2025-05-25 Origin: Site
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● The wear resistance of PEEK resin
● The wear resistance of carbon fiber reinforced PEEK
● What is a transfer membrane? What is its influence on the friction performance of PEEK?
We always think that the wear resistance of carbon fiber reinforced PEEK has always been lower than that of PEEK resin, but this is not entirely correct.
Through experiments, it was found that the frictional properties of these two PEEK materials are different when they are below or above the glass transition temperature.
Below the Tg, the coefficient of friction of pure PEEK is lower than the carbon fiber reinforced PEEK. Above the Tg, the friction coefficient of carbon fiber reinforced PEEK is lower than the PEEK resin.
PEEK material features excellent mechanical properties, high-temperature resistance, low friction coefficient and good load-bearing meshing.
It has the same excellent self-lubricating performance as PTFE material. However, PEEK material has better load-bearing capacity, mechanical properties and better creep resistance.
It can manufacture components such as bearings, gear piston rings and flexible seals, and can be used in environments without lubrication, with low speed and high load, high temperature, humidity and pollution
Carbon fiber not only enhances the mechanical properties of PEEK, but also has a significant impact on the frictional properties of PEEK material.
Friction experiments were conducted using 30% chopped carbon fiber reinforced PEEK.
It was found that the stiffness of PEEK composites below the glass transition temperature was significantly improved, the wear rate was low, and the friction coefficient was higher than that of pure PEEK. When the temperature exceeded T g, the thermal softening caused by the glass transition led to the decline of the wear resistance of both, but the decline of the wear resistance of the composites was much better.
Due to the reinforcement of CF offsetting the thermal softening of PEEK and forming a highly strong transfer film that effectively protects the contact area, the friction coefficient and specific wear rate of CF/PEEK are significantly lower than those of pure PEEK.
The correlation between the friction properties of CF/PEEK composites and the test conditions such as the roughness of the mating surface, pressure and speed was investigated. It is found that when the polished and ground stainless steel dual surfaces slide, the influence of the dual surface roughness on the wear rate of CF/PEEK is not as obvious as that on pure PEEK. When the friction distance exceeds 90km, due to more CF turning into graphite and entering the transfer film, both the friction coefficient and wear rate are lower than those of pure PEEK.
Under the same experimental conditions, the friction loss performance of CF/PEEK composites is significantly better than that of glass fiber /PEEK composites. The improvement degree of CF on the material's toughness is more than five times that of the same amount of glass fiber.
During the sliding friction process, the roll-shaped wear debris formed by the delamination wear of CF/PEEK composites is the main cause of the formation of the transfer film.
The polymer facing the sliding direction is ground off first, exposing the CF. The exposed CF is completely broken, forming CF grinding debris on the side. After CF is ground, it turns into layered graphite particles with excellent lubricating effects, which enter the transfer film and are repeatedly compacted to make the transfer film more continuous. This is conducive to improving the strength, toughness, fracture toughness, smoothness and service life of the transfer film, thereby reducing the friction coefficient and wear rate of the composite material.