Analysis of the wear-resistant properties of carbon fiber reinforced nylon (CF/PA) composite materials
Nylon (PA) is widely used as a multifunctional thermoplastic polymer composite material in many fields because of its outstanding mechanical properties, low friction coefficient, and excellent strength impact. However, in high-end industries with high requirements for product performance, such as new energy, high-speed medical treatment, and smart equipment, traditional PA materials have shown product limitations in terms of heat resistance and dimensional maintenance. To solve these problems, continuous carbon fiber-reinforced thermoplastic composite materials formed by combining carbon fiber (CH) with traditional PA materials emerged. This material not only significantly improves mechanical properties, but also performs excellently in other physical properties such as wear resistance.
The Friction and Wear Properties of Thermoplastic Pa6 Composites Filed with Carbon Fiber evaluates the performance of CF/PA composite materials in detail, selects carbon fibers with different volume percentages (10vol%, 20vol%, 30vol%) as reinforcement, and conducts friction wear tests under the conditions of humidity (30~45%), set load (0~16N) and friction frequency (0-12HZ).
Changes in friction coefficient
Under the set load of 9N and the friction frequency of 4HZ, the friction coefficient of pure PA material samples increases rapidly over time. The friction coefficient of 20wt% and 30wt% CF/PA composite material samples increases with time mainly in a parabolic pattern, while the friction coefficient of 10wt% CF/PA composite material samples increases first and then decreases, finally showing an upward trend.
In summary, as the volume percentage of carbon fiber reinforcement increases, the friction coefficient of the formed CF/PA composite material gradually decreases, and it can be seen that the friction coefficient of pure PA material is higher than that of any volume percentage of CF/PA composite material. The most prominent is that the 20wt% CF/PA composite material shows the lowest friction coefficient. This is caused by the interaction between the carbon fiber or microstructure on the carbon fiber surface and the matrix interface. It may have a certain lubrication effect during the friction process, thereby reducing the friction coefficient of the composite material.
Friction damage volume
Under the same load force or friction frequency, the friction damage volume of the pure PA material sample is the largest, while the friction damage volume of the 20wt19% CF/PA composite material is the smallest. This shows that the CF/PA composite material has better durability. When the load force is increased to 9-15N, the friction damage volume of the 30wt% CF/PA composite material suddenly increases sharply, which may be due to the excessive carbon fiber content causing the internal stress of the composite material to concentrate in one place.
According to the SEM scanning results, there are obvious microcracks on the surface of the pure PA material sample, and the peeling phenomenon is produced, but the wear marks of the CF/PA composite material are significantly less, especially the 20wt% CF/PA composite material, which almost does not have this peeling phenomenon. It can be said that the appropriate amount of carbon fiber reinforcement can effectively support the load pulling from the contact surface and prevent the material from separating.
In the actual production of CFPA6, Zhishang New Materials Technology found that the performance of the composite material will also be directly affected by the resin gold bullet. The study found that when the mass fraction of continuous carbon fiber and PA resin are fused, the tensile strength, bending elastic modulus, and bending strength of the composite material are improved most significantly, which can be 2-3 times higher than that of pure PA resin. This fully shows that thermoplasticity and resin properties can be greatly improved under the reinforcement of carbon fiber.
At the pace of the times, the development of science and technology and the advancement of technology can provide a deeper upgrade for CF/PA composite materials. We believe that this material can be more widely used in various fields in the future. Especially in scenarios that require resistance to highly damaged environments such as high temperature and high humidity.
