709/10000
实时翻译
划译
The application history of continuous fiber reinforced thermoplastic composites is not very long, but with good structural performance, they are significantly better than thermosetting composites in terms of impact resistance, corrosion resistance, forming cycle, and sustainability.
The application value of continuous fiber reinforced thermoplastic composites mainly depends on the reinforcing body and matrix resin. The reinforcing fibers determine the final mechanical properties of the composite material. The reinforcing fibers themselves are high-performance materials, namely high strength and high modulus. As reinforcing materials, they must also have excellent thermal stability and high temperature resistance.
Currently, glass fiber, carbon fiber, and high-performance organic fibers are all popular reinforcements for manufacturing high-performance FRTP. Among them, carbon fiber materials have diverse performance advantages such as high specific strength, fatigue resistance, strong X-ray transmittance, low coefficient of thermal expansion, corrosion resistance, and high temperature resistance. They have become the most widely used and versatile reinforcing fiber currently, and are widely used in many fields such as aviation, military industry, high-end medical, and intelligent machinery.
There are two types of reinforcement methods for thermoplastic composites: short fiber reinforcement and continuous fiber reinforcement. Continuous fibers are prone to form a "skeleton structure" within the product, exhibiting better mechanical and high-temperature resistance than short fiber reinforced thermoplastic composites, thus enabling better enhancement of the fiber reinforcement effect. Therefore, high-performance FRTP adopts continuous fiber reinforcement method.
As a matrix, thermoplastic resins not only need to have good mechanical properties, high stability, and chemical corrosion resistance, but also need to pay attention to their processing performance. Because high-performance thermoplastic resins are often insoluble or even insoluble, this poses difficulties for resin impregnation and molding processing of composite materials. For example, the melt impregnation method requires the resin to have a low viscosity and high surface tension in the molten state in order to have good wettability with fibers. For example, thermosetting resins can easily transition to a low viscosity state before curing, and in this state, they are also easy to impregnate fibers.
However, PEEK, these high-end thermoplastic resins, have high viscosity in the molten state and cannot effectively impregnate fiber bundles. Therefore, the biggest difficulty in preparing continuous carbon fiber reinforced thermoplastic composites lies in dealing with the high viscosity issue of thermoplastic resins during impregnation.
Related