CN1399017A

CN1399017A - Method and special plant for producing graphitized carbon fiber

Info

Publication number: CN1399017A
Application number: CN 02128419
Authority: CN
Inventors: 王浩静; 刘颖; 周立公; 晁兵
Original assignee: Shanxi Institute of Coal Chemistry of CAS
Current assignee: Shanxi Institute of Coal Chemistry of CAS
Priority date: 2002-08-06
Filing date: 2002-08-06
Publication date: 2003-02-26
Anticipated expiration: 2022-08-06
Also published as: CN1170020C

Abstract

In the present invention, cooling water and Ar as working medium are first introduced into the plasma generator; and under pressure of 0.3-0.5 MPa and current of 80-100 A, the plasma generator produces local high temperature of 2500-3500 deg.c. Carbon fiber is made to pass through the high temperature area with the stay time being 10-20 sec, so as to obtain graphitized carbon fiber. It has simple technological process, low cost, and low power consumption and the plasma can be heated and cooled instantaneously and this results in high comprehensive material performance and environment friendly technological process.

Description

One sharp method and the isolated plant thereof of producing graphitized carbon fibre

Technical field:

The invention belongs to a kind of method of producing graphitized carbon fibre, relate in particular to a kind of characteristics of utilizing hot plasma high temperature, high reaction activity, the production method of graphitized carbon fibre and isolated plant under oxygen-free environment.

Background technology:

Carbon fiber one emerges, and promptly gains great popularity with high-strength, high-modulus, the anti-ablation of its uniqueness, excellent properties such as can weave, can conduct electricity, and becomes a brilliant star in the material world.High-modulus charcoal (graphite) fiber is an important kind in the charcoal fiber family, is the most important reinforcing material of advanced composite material, and purposes is widely arranged in the national defense construction and the development of the national economy.Carbon fiber is at 2000-3000 ℃ and apply under the traction condition and heat, and makes that graphite microcrystal axial orientation degree increases in the fiber, and size increases, and degree of perfection increases, and promptly obtains high mould graphite fibre.Graphite fibre is to prepare through graphitization processing on the basis of carbon fiber, thereby the key of development graphite fibre is high-temperature technology and high-temperature service, i.e. graphitizing furnace.General in the world graphitization technique all adopts the tubular graphene stove at present.This method for graphitizing is the equipment manufacturing cost costliness not only, and energy consumption is big, and the thermal efficiency is low.

Summary of the invention;

The purpose of this invention is to provide a kind of technology is simple, product cost is low, energy consumption is low method for preparing the high-performance graphite fibre and isolated plant.

The method that the present invention prepares the high-performance graphite fibre comprises the steps:

One, at first cooling water and working media argon gas are fed plasma generator;

Two, when pressure P=0.3-0.5MPa, plasma generator produced the high temperature of 2500 ℃～3500 ℃ of regional areas when electric current was 80-100A, beyond this zone is room temperature, with carbon fiber by the plasma high-temperature district, by the time the time of staying be 10-20 second, thereby obtain graphitized carbon fibre.

In order to realize foregoing invention, designed the plasma generator isolated plant, it is by connecting by insulating flange between negative electrode and the anode; Cooling water pipe links to each other with anode.Connect with flange between anode and the reacting furnace, the argon gas ingress pipe links to each other with negative electrode

The present invention compared with prior art has following advantage: technology is simple, product cost is low, energy consumption is low.Hot plasma can be realized moment high temperature and rapid quench, has ensured the combination property of material.Not only whole technical process environmental friendliness, and can change the degree of graphitization that technological parameter is controlled the gained carbon fiber.

The specific embodiment:

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the vertical section structural map of plasma reactor.

Embodiment 1 connects by insulating flange 7 between negative electrode 4 and the anode 3 as shown in the figure, and cooling water pipe inlet 2 links to each other with anode 3 with welding manner, and with flange 8 connections, argon gas ingress pipe 5 links to each other with negative electrode 4 between anode 3 and the reacting furnace 1.Just cooling water feeds from cooling water pipe inlet 2, feeds argon gas by argon gas ingress pipe 5, and makes pressure apply the direct current of 80A simultaneously to negative electrode 4 and anode 3 the two poles of the earth at 0.3MPa, makes the gas continuous discharge, forms electric arc.By carbon fiber, the control time of staying of carbon fiber in stove is 20 seconds from reacting furnace 1.Reaction finishes its tensile modulus of back test, and the results are shown in Table 1 for it.

Embodiment 2

The adjustment electric current is 90A, and the reacting furnace internal pressure is 0.4MPa.The control time of staying of carbon fiber in stove is 15 seconds.Other all carries out with quadrat method and condition by embodiment 1, and reaction finishes its tensile modulus of back test, and the results are shown in Table 1 for these.

Embodiment 3

The adjustment electric current is 100A, and the reacting furnace internal pressure is 0.5MPa.The control time of staying of carbon fiber in stove is 10 seconds.Other all carries out with quadrat method and condition by embodiment 1, and reaction finishes its tensile modulus of back test, and the results are shown in Table 1 for these.

Table 1

Condition, result/example number	Embodiment 1	Embodiment 2	Embodiment 3
Condition, result/example number	Embodiment 1	Embodiment 2	Embodiment 3	Pressure (MPa)	????0.3	????0.4	????0.5
The time of staying (s)	????20	????15	????10	Pressure (MPa)	????0.3	????0.4	????0.5
The time of staying (s)	????20	????15	????10	Electric current (A)	????80	????90	????100
Tensile modulus (GPa)	????377	????382	????390	Electric current (A)	????80	????90	????100

As can be seen from the above table: adopt above-mentioned embodiment, the tensile modulus of the graphite fibre that produces has reached the level of M40J (377GPa).

Claims

1. A method for producing graphitized carbon fibers, characterized in that it may further comprise the steps:

(1), first pass the cooling water and the working medium argon into the plasma generator;

(2) When the pressure P=0.3-0.5MPa and the current is 80-100A, the plasma generator generates a high temperature in a local area of 2500 ° C ~ 3500 ° C, and the room temperature is outside this area, and the carbon fiber passes through the plasma high temperature area, The residence time during passage is 10-20 seconds, thereby obtaining graphitized carbon fibers.

2. a kind of device producing graphitized carbon fiber as claimed in claim 1 is characterized in that it is connected by insulating flange (7) between cathode (4) and anode (3); Cooling water pipe (2) and The anode (3) is connected. The anode (3) and the reaction furnace (1) are connected by a flange (8), and the argon gas introduction pipe (5) is connected with the cathode (4).