Method for producing high-strength high-modules carbon fibre and special equipment thereof

Abstract

The present invention relates to a high-strength high-modules carbon fibre and its special equipment. It is characterized by that its high-frequency heating reaction pipe is formed from deoxygenationsection. cracking section, graphitizing section air-cooling section and water-cooding section. The carbon fibre can be continuously passed through said sectional reactino pipe, the reaction temp. of the graphitizing section is controlled at 2500-2650 deg.C, under the action of catalyst the graphitizing process of carbon fibre is completed. The drafting equipment is equipped with a drafting force display device, the drafting force can be controlled in the optimum state, it also has an optical temp.-measuring device, and the output power is controlled and regulated by computer. The strength of said fibre of greater than 3.5 GPa, and its modules is greater than GPa.

Description

(1) Technical field [0001] The invention belongs to a processing technology and a special production device for preparing carbon fiber, and in particular relates to a production method of high-strength and high-modulus carbon fiber and special production equipment thereof. (2) Background technology [0002] High modulus carbon fiber, also known as graphitized fiber, has become a new type of reinforced composite material urgently needed by aviation, aerospace, military and scientific research due to its excellent properties such as high specific modulus, high specific strength and low thermal expansion coefficient. In particular, the production of graphitized carbon fiber continuous filaments has particularly important scientific significance and economic value. The commonly used carbon fiber production process in the world is to pre-oxidize the polyacrylonitrile fiber first, then carbonize it at a high temperature of 1000-1500 ° C, and then undergo a high temperature treatme...

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Problems solved by technology

After trial use, the main shortcomings of this device are: 1. Due to factors such as fluctuations in the external voltage of the high-frequency heater, the output power is unstable, and the temperature of the carbon fiber heating fluctuates, which affects product quality; 2. The temperature adjustment of the high-frequency heater Manual mechanical adjustment is used, the control is not sensitive, the temperature fluctuation period is long, and the product quality is uneven; 3. Due to the different diameters of carbon fiber filaments, the induced voltages are different, and it is easy to cause ignition between filaments during the heating process, and hair loss occurs. Silk affects product quality. In order to avoid this phenomenon, the carbon fiber needs to be twisted during the heating process. For the multi-K silk, the advantage is to avoid the phenomenon of sparking, and the disadvantage is that the tow is not easy to scatter during use. Affect the product utilization; 4. The drafting force is realized through the differential speed of the retracting and unwinding mechanism, but the magnitude of the drafting force cannot be displayed, so it cannot be produced under the condition of the best drafting force, so that the drafting cannot play its due role; 5. The heating temperature is designed to be 2500-3000°C. Although high heating temperature can increase the modulus of the fiber, it also reduces the strength of the fiber. It is difficult to produce high-strength, high-modulus graphitized fiber materials, which affects its application range; 6 . The reaction tube of this device is a slender quartz tube, the function of the reaction process is not obvious, the residence time of carbon fiber in the graphitization section cannot be strictly controlled, the graphite fiber crystal cannot be refined, and the strength cannot be guaranteed

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