CN104651982A - Preparation method of high-intensity carbon fibers and special device - Google Patents
Preparation method of high-intensity carbon fibers and special device Download PDFInfo
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- CN104651982A CN104651982A CN201310601501.0A CN201310601501A CN104651982A CN 104651982 A CN104651982 A CN 104651982A CN 201310601501 A CN201310601501 A CN 201310601501A CN 104651982 A CN104651982 A CN 104651982A
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Abstract
The invention discloses a preparation method of high-intensity carbon fibers and a special device. The preparation method comprises the following steps that CH4 and Ar are introduced into a plasma generator at a certain ratio; the plasma generator generates high temperature of 2500 DEG C-3500 DEG C in a local region under controlled pressure and current, and the carbon fibers pass through the plasma high-temperature region with the retention time of 10-20 seconds, thereby obtaining the graphitization carbon fibers with high intensity and high modulus. According to the invention, graphitization and fiber surface and interior carburization are achieved in the same equipment, and the technology is simple, and the graphitization carbon fibers with high intensity and modulus are obtained.
Description
Technical field
The invention belongs to a kind of manufacture method and special purpose device of high-strength carbon fiber, relate in particular to a kind of use heat plasma technology to prepare high-strength and high-modulus graphite fibre method and special purpose device.
Background technology
Carbon fiber one emerges, namely with high-strength, high-modulus, the resistance to ablation of its uniqueness, can weave, the excellent properties such as can to conduct electricity enjoys favor, to become in the material world a brilliant nova.High-modulus carbon (graphite) fiber is an important kind in carbon fiber family, is the most important reinforcing material of advanced composite material.In China's construction and the development of the national economy, there is purposes widely, can be used for the fields such as Aeronautics and Astronautics, infrastructure, the vehicles.Therefore, development speed is surprising especially, and the economic scale estimate of International Carbon fiber is 1000t/p.Except output increases substantially, and kind also constantly increases and forms series of products.External high mould carbon (graphite) fiber has reached economic scale hundred tonnes of commercial production levels, and performance improves constantly, and product specification is complete.Its development characteristic is used for non-bearing part, secondary bearing member from the beginning of the sixties, has marched toward the practical stage of main load-bearing part now; Develop many reinforcements used for advanced composite material newly in addition, however come out top in numerous reinforcements still belong to carbon (graphite) fibre reinforcement.Although there has been significant progress in China in the development of carbon fiber field decades, the development work of high-performance carbon fibre has been made slow progress generally, can not meet the demand of national defence high-tech and the national economic development far away.
Celion prepares through graphitization processing on the basis of carbon fiber.Carbon fiber is at 2000 ~ 3000 DEG C and heat under applying traction condition, to make in carbon fiber graphite microcrystal vertically the degree of orientation increase, graphite microcrystal size increases, and interlamellar spacing reduces, and substantially increases degree of graphitization.Carbon fiber stretch modulus through graphitization processing is improved, and evaporate at graphitizable high temperature district fiber surface carbon, make original blemish more obvious, and the intensity of the fault of construction of carbon fiber on carbon fiber have conclusive impact, causes TENSILE STRENGTH to decrease.
Summary of the invention
The object of this invention is to provide a kind of manufacture method and special purpose device of high-strength carbon fiber,
To achieve these goals, technical scheme of the present invention is as follows:
By working media
plasma generator is passed into Ar, at certain pressure, under current condition, plasma generator produces the high temperature of 2500 DEG C ~ 3500 DEG C of regional areas, and by carbon fiber by plasma high-temperature district, methane cracking under high-temperature electric arc action of plasma produces ion carbon steam; By carbon fiber by plasma high-temperature district, ion carbon infiltrates in the hole of carbon fiber after graphitization and surface, reaches surface densification process, improves the object of strength and modulus.
The manufacture method of high-strength carbon fiber of the present invention comprises the steps:
(1), will
with Ar with
the proportioning accounting for 1-10% of Ar volume passes into plasma generator;
(2) be, 0.3-0.5MPa at controlled pressure, when electric current is 80-100A, plasma generator produces the high temperature of 2500 DEG C ~ 3500 DEG C of regional areas, be room temperature beyond this region, methane cracking under high-temperature electric arc action of plasma produces ion carbon steam;
(3) by carbon fiber by plasma high-temperature district, by time the time of staying be 10-20 seconds, thus obtain the graphitized carbon fibre of high strength and high-modulus.
In order to realize foregoing invention, devise plasma generator special purpose device, it is connected by insulating flange by between negative electrode and anode; Cooling water pipe and methane ingress pipe connect with anode, and with Flange joint between anode and reaction tube, argon gas wireway is connected with negative electrode.
The present invention compared with prior art tool has the following advantages: owing to adopting such scheme, realize the carburizing of graphitization and fiber surface and inside in a set of equipment simultaneously, solve carbon fiber and graphite rear surface defect and cause intensity to reduce this great difficult problem, technique is simple, obtains the graphitized carbon fibre of high strength and high-modulus.
Accompanying drawing explanation
Accompanying drawing is the vertical section structure figure of plasma reactor of the present invention.
Detailed description of the invention
Embodiment 1:
As shown in the figure, connected by insulating flange 7 between negative electrode 4 and anode 3; Cooling water pipe entrance 2 and hydrocarbon feed ingress pipe 1 connect with anode 3 with welding manner; Molybdenum liner anode 3 inlays connection, and connect with flange 8 between anode 3 and reaction tube 9, argon gas wireway 5 is connected with negative electrode 4.Cooling water is passed into from cooling water pipe entrance 2, pass into argon gas by argon gas wireway 5, methane is passed into by methane ingress pipe 1 with the amount accounting for argon gas volume 1% simultaneously, and makes pressure apply the direct current of 80A to negative electrode 4 and anode 3 the two poles of the earth at 0.3MPa simultaneously, make gas continuous discharge, form electric arc.From reaction tube 9 by carbon fiber, controlling the time of staying of carbon fiber in stove is 20 seconds.Reaction terminates its tensile modulus of rear test and tensile strength, and the results are shown in Table 1 for it.
Embodiment 2:
Methane together passes into continuously with the proportioning and argon gas that account for argon gas volume 5%, and adjustment electric current is 90A, and reaction overpressure is 0.4MPa.Controlling the time of staying of carbon fiber in stove is 15 seconds.Other is all undertaken by embodiment 1 same method and condition, and reaction terminates its tensile modulus of rear test and tensile strength, and the results are shown in Table 1 for it.
Embodiment 3:
Methane together passes into continuously with the proportioning and argon gas that account for argon gas volume 10%, and adjustment electric current is 100A, and reaction overpressure is 0.5MPa.Controlling the time of staying of carbon fiber in stove is 10 seconds.Other is all undertaken by embodiment 1 same method and condition, and reaction terminates its tensile modulus of rear test and tensile strength, and the results are shown in Table 1 for it.
Table 1
| Condition, result/example number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Methane/argon gas (%) | 1 | 5 | 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) | 375 | 382 | 390 |
| Tensile strength (MPa) | 4528 | 4531 | 4550 |
As can be seen from the above table: adopt above-mentioned embodiment, the tensile modulus and the tensile strength that produce graphite fibre reach
m60Jthe level of (377GPa, 4410 MPa).
Claims (2)
1. a manufacture method for high-strength carbon fiber, is characterized in that comprising the steps:
(1), will
with Ar with
the proportioning accounting for 1-10% of Ar volume passes into plasma generator;
(2) be 0.3-0.5MPa at controlled pressure, when electric current is 80-100A, plasma generator produces the high temperature of 2500 DEG C ~ 3500 DEG C of regional areas, is room temperature beyond this region, and methane cracking under high-temperature electric arc action of plasma produces ion carbon steam;
(3) by carbon fiber by plasma high-temperature district, by time the time of staying be 10-20 seconds, thus obtain the graphitized carbon fibre of high strength and high-modulus.
2. the device that a kind of manufacture method of high-strength carbon fiber is used according to claim 1, is characterized in that it is connected by insulating flange (7) by between negative electrode (4) and anode (3); Cooling water pipe (2) and methane ingress pipe (1) connect with anode (3), and connect with flange (8) between anode (3) and reaction tube (9), argon gas ingress pipe (5) is connected with negative electrode (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310601501.0A CN104651982A (en) | 2013-11-25 | 2013-11-25 | Preparation method of high-intensity carbon fibers and special device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310601501.0A CN104651982A (en) | 2013-11-25 | 2013-11-25 | Preparation method of high-intensity carbon fibers and special device |
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| Publication Number | Publication Date |
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| CN104651982A true CN104651982A (en) | 2015-05-27 |
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| CN201310601501.0A Pending CN104651982A (en) | 2013-11-25 | 2013-11-25 | Preparation method of high-intensity carbon fibers and special device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962287A (en) * | 2020-07-29 | 2020-11-20 | 孙世超 | Process for preparing high-performance low-cost graphitized carbon fiber by using joule heating technology |
-
2013
- 2013-11-25 CN CN201310601501.0A patent/CN104651982A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111962287A (en) * | 2020-07-29 | 2020-11-20 | 孙世超 | Process for preparing high-performance low-cost graphitized carbon fiber by using joule heating technology |
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Application publication date: 20150527 |