Surface processing method and device of moderate and high strength carbon fibre

Abstract

The invention relates to a surface processing method and a device of moderate and high strength carbon fibre. The moderate and high strength carbon fibre the carbon content of which is more than 90 percent is led into an electrolytic tank and is subjected to electrochemistry processing by the compound electrolyte solution of sodium succinate, succinic acid and ammonium oxalate. At the same time, proper processing temperature, processing time and current density are controlled. Finally the carbon fiber is cleaned in water and dried. Consequently, the surface processing method of the moderate and high strength carbon fibre, which has the advantages of convenient operation, simple device, no environmental pollution and low cost, is obtained. After the surface processing, the interlamination shearing strength and the body tensile strength of the carbon fibre compound material are improved greatly.

Description

Technical field: [0001] The invention relates to a surface treatment method and equipment for medium and high-strength carbon fibers. Background technique: [0002] As an advanced composite material, carbon fiber composite material has a series of excellent properties such as light weight, high strength, high rigidity, fatigue resistance and small thermal expansion coefficient compared with traditional metal materials. Among them, the reinforced carbon fiber is a new type of fibrous carbon material with a carbon content of more than 93% obtained by high-temperature carbonization at 1300-1600 ° C, which requires high body strength. Due to the smooth surface of high-strength carbon fiber and small specific surface area, it is formed by carbonization treatment in high-temperature inert gas, the migration of non-carbon elements and the enrichment of carbon make its surface activity low, resulting in interfacial adhesion between carbon fiber and composite material matrix. Reduci...

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Problems solved by technology

Not only that, the traditional electrolytic cell is deep, and it is not easy to deal with broken wires; the bubbles generated by the electrochemical electrodes are not easy to discharge quickly, which easily hinders the electrolytic reaction rate on the surface of the anode and affects the modification effect

In addition, guide rollers must be installed in the traditional electrolytic cell. Due to the corrosiveness of the electrolyte solution, the material and mechanism of the guide rollers are prone to failure. Too many guide rollers will also cause unnecessary damage to the carbon fiber during high-speed production.

Under normal circumstances, the interlaminar shear strength of CFRP and the tensile strength of carbon fiber are mutually restricted, and the improvement of one is always at the expense of the reduction of the other. Traditional surface treatment equipment and processes make the tensile strength of carbon fiber serious loss

Therefore, there are very few reports on the modification of carbon fibers by traditional electrochemical surface treatment methods to improve the interlaminar shear strength of carbon fiber composites while maintaining the tensile strength of carbon fibers or even improving the tensile strength of carbon fibers.

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