Two ways for carbon fiber composites to meet special performance requirements

Article source: Carbon fiber composite material? After decades of development, high-performance advanced composite material carbon fiber has become one of the preferred material solutions for the upgrading and upgrading of aerospace, rail transit, intelligent machinery, high-end medical equipment and a variety of civilian products
.
Carbon fiber composite material has the advantages of light weight, high strength, low creep, corrosion resistance, fatigue resistance, etc.
, but when meeting special needs, it still has certain problems or defects.
How to effectively improve these problems and improve carbon fiber composite materials Currently, there are several typical solutions for the application value of the composite material:? 1.
High brittleness and easy cracking-Solution: toughening:? The carbon fiber reinforced composite material has high strength and good performance, but the particularity of the composite material molding process will give the compound The impact resistance, fracture toughness and delamination strength of the material have a negative impact
.
Carbon fiber composite materials will form different failure mechanisms under the action of mechanical loads
.
Once the released strain energy exceeds the energy required to create a new surface area or produce plastic deformation near the crack tip, the crack propagation at these stages may cause serious consequences
.
? Adding tougheners to the resin is a conventional method to solve the problem of brittle carbon fiber materials and easy to produce small cracks, but the toughness enhancing particles generally have poor dispersion and often form high and low particle density regions, which will reduce the unevenness Comprehensive performance of composite materials
.
At present, developed countries such as Europe and the United States have begun to pave nanofiber membranes between the prepreg layers.
These membranes will not increase the thickness and weight of the prepreg.
They can act as a nano-level reinforcing material for the brittle resin matrix in the interlayer area, and finally form a tougher The resin (which can be used together with other toughening systems), this solution is conducive to improving the delamination resistance, damage tolerance and fatigue resistance of carbon fiber composite materials, so that it can reduce the occurrence of micro cracks when subjected to pressure or impact
.
2.
Not resistant to high temperature and wear-Solution: Thermoplastic: At present, the most widely used carbon fiber composite material in China is still epoxy resin based.
This type of thermosetting carbon fiber composite material can satisfy general industrial or civil use.
However, for some parts with extremely high performance requirements, epoxy-based carbon fiber composites still have a certain gap in high temperature resistance and wear resistance
.
To this end, many companies in the carbon fiber industry are actively looking for solutions
.
For example, Mitsubishi Chemical recently announced the launch of a new product of carbon fiber prepreg based on cyanate ester resin, claiming that this cyanate ester resin carbon fiber composite material can have both high strength and heat resistance
.
? For the carbon fiber composite material system, not only is it difficult to have both high strength and high temperature resistance, but also performance advantages such as wear resistance will restrict each other
.
In fact, the main reason for the defects of carbon fiber composite materials is the matrix material.
In the past, the heat resistance of composite materials was usually improved by adding bismaleimide, but the final performance results were still not very satisfactory
.
The domestic carbon fiber parts manufacturer Zhishang New Materials has developed continuous carbon fiber reinforced thermoplastic composite materials, such as continuous carbon fiber reinforced PPS/PES/PA6/PEEK and other unidirectional prepregs, which are used in special or high-end parts.
It replaces thermosetting carbon fiber materials and exhibits comprehensive advantages such as high strength, high temperature resistance, good wear resistance, corrosion resistance, and high safety factor in later product applications.
It has become the preferred solution for carbon fiber composite materials that are not resistant to high temperatures and wear.
One
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