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Viscose high-temperature graphite carbon fiber step-by-step carbonization method

A high-temperature graphite, step-by-step carbonization technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of high heteroatom content affecting the performance of carbon fibers, etc., to improve the carbonization rate, reduce the amount of ablation, and improve high temperature tolerance. Effect

Inactive Publication Date: 2019-07-05
梁继选
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, in order to avoid excessive ablation in the traditional carbon fiber carbonization process, it is difficult for high temperature carbonization to exceed 2000°C, resulting in high heteroatom content in the finished product and affecting the performance of carbon fibers.

Method used

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  • Viscose high-temperature graphite carbon fiber step-by-step carbonization method
  • Viscose high-temperature graphite carbon fiber step-by-step carbonization method
  • Viscose high-temperature graphite carbon fiber step-by-step carbonization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The viscose fiber soaked and dried in ammonium bromide is pre-cured at low temperature, the temperature is controlled at 80 °C, and the feeding is controlled by the feeding roller. The feeding speed is 1m / min, and the filling volume ratio is 1.5:1. The mixed gas is used for protection; after the end, the viscose fiber pre-cured at a low temperature is carbonized at a medium temperature, and the temperature is 300 ° C, and the mixed gas of nitrogen and water vapor is filled with a volume ratio of 1:1 for protection; finally, after carbonization at a medium temperature The viscose fiber was carbonized at high temperature, the temperature was controlled at 2400 °C, and the protection was filled with argon gas for 72 hours.

Embodiment 2

[0037] The viscose fiber soaked and dried in ammonium bromide is pre-cured at low temperature, the temperature is controlled at 80 °C, and the feeding is controlled by the feeding roller. The feeding speed is 1m / min, and the filling volume ratio is 1.5:1. The mixed gas is used for protection; after the end, the viscose fiber pre-cured at a low temperature is carbonized at a medium temperature, and the temperature is 300 ° C, and the mixed gas of nitrogen and water vapor is filled with a volume ratio of 1:1.5 for protection; finally, after carbonization at a medium temperature The viscose fiber was carbonized at high temperature, the temperature was controlled at 2400 °C, and the protection was filled with argon gas for 72 hours.

Embodiment 3

[0039] The viscose fiber soaked and dried in ammonium bromide is pre-cured at low temperature, the temperature is controlled at 80 °C, and the feeding is controlled by the feeding roller. The feeding speed is 1m / min, and the filling volume ratio is 1.5:1. The mixed gas is used for protection; after the end, the viscose fiber pre-cured at a low temperature is carbonized at a medium temperature at a temperature of 300 ° C, and the mixed gas of nitrogen and water vapor is filled with a volume ratio of 1:2 for protection; finally, the carbonized at a medium temperature The viscose fiber was carbonized at high temperature, the temperature was controlled at 2400 °C, and the protection was filled with argon gas for 72 hours.

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Abstract

The invention discloses a viscose high-temperature graphite carbon fiber step-by-step carbonization method. The viscose high-temperature graphite carbon fiber step-by-step carbonization method includes the steps of low-temperature procuring, medium-temperature carbonization and high-temperature carbonization. By carbonizing viscose fibers step by step, nitrogen is introduced during low-temperatureprocuring and medium-temperature carbonization to conduct oxidation prevention, at the same time, vapor is introduced to wet the viscose fibers during carbonization, therefore, the viscose fibers areprotected, and the situations are avoided that due to high-temperature ablation, ablation cracks and grooves are generated on the surfaces of the viscose fibers to make the viscose fibers crisp, andaccordingly the high-temperature tolerance of the viscose fibers and the tension strength of final products are reduced; through low-temperature procuring and medium-temperature carbonization, the surfaces of the viscose fibers are carbonized, and the high-temperature tolerance is improved, so that the viscose fibers can meet high-temperature carbonization requirements at 2400 DEG C; the carbonization ratio during high-temperature carbonization is increased, and the ablation amount is reduced.

Description

technical field [0001] The invention belongs to the technical field of carbon fibers, and particularly relates to a step-by-step carbonization method for viscose high-temperature graphite carbon fibers. Background technique [0002] Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus fiber with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by carbonization and graphitization by stacking organic fibers such as flake graphite microcrystals along the fiber axial direction. Carbon fiber is "soft on the outside and rigid on the inside", which is lighter than metal aluminum, but stronger than steel, and has the characteristics of corrosion resistance and high modulus. It is an important material in national defense, military industry and civilian use. It not only has the inherent intrinsic properties of carbon materials, but also has the soft processability of textile fibers. It is a new generati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/16
CPCD01F9/16
Inventor 梁继选
Owner 梁继选