CN1255592C - Repairing method of carbon fiber surface defect - Google Patents
Repairing method of carbon fiber surface defect Download PDFInfo
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- CN1255592C CN1255592C CN 02121070 CN02121070A CN1255592C CN 1255592 C CN1255592 C CN 1255592C CN 02121070 CN02121070 CN 02121070 CN 02121070 A CN02121070 A CN 02121070A CN 1255592 C CN1255592 C CN 1255592C
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- carbon fiber
- acetylene
- carbon
- carbon fibers
- reactor
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Abstract
The present invention relates to a method for controlling the quality of carbon fibers and graphitization carbon fibers, which is a replenishing procedure of repairing surface hole defects generated after the carbon fiber processing in a vapour deposition method. Specifically, after the carbon fibers are heated by the induction of a focused electromagnetic field, acetylene reaction environment is established. Thus, acetylene is cracked into hydrogen gas and carbon atoms beside the high temperature carbon fibers. The carbon atoms deposit on the surface of the carbon fibers, particularly the hole positions so as to the achieve the purpose of repairing the defects.
Description
Technical field
The invention belongs to the improvement of carbon fiber processing technology and replenish, particularly the method that the surface hole that forms in the existing production technology of carbon fiber is handled.
Background technology
Carbon fiber (or graphite fibre) is raw material and the carbon fiber of processing with the pdyacrylonitril precursor particularly in the processing process.Owing to uniformity reason in the defective of precursor itself and the process causes the formation of surface hole defect, the stress concentration phenomenon when these holes cause fiber stressed also is the principal element of single wire fracture.Recovery to these surface hole defects is the problem of very paying close attention in the carbon fiber production field always, but does not have good method so far, thus can only sacrifice the monofilament of existing hole at present, thus cause the obvious decline of the whole mechanical performance index of carbon fiber.
Summary of the invention
Purpose of the present invention promptly provides a kind of method of repairing the carbon fiber surface hole, and specifically the method for repairing with carbon coating to overcome cavitation, significantly improves the mechanical property of carbon fiber.
Concrete method is to utilize the radio frequency focusing device that carbon fiber induction is heated, and near established hole, can cause the magnetic line of force to compress owing to the reason of hole, and temperature obviously raises, and at this moment will build the reaction environment of an acetylene gas in the quartz ampoule reaction equation formula device.Acetylene cracking under hot environment generates hydrogen and free carbon atom, and carbon atom is deposited on the carbon fiber surface of high temperature.Owing to hole place temperature high carbon atom deposition velocity realizes repair to hole soon, thereby can eliminate or slacken the stress concentration phenomenon effectively, improve the mechanical performance index of carbon fiber greatly.
The structural representation of specially putting below in conjunction with the heating of the radio frequency that provides is as protecting the repairing task that realizes carbon fiber surface defect to further specify method of the present invention.
Description of drawings
Fig. 1 promptly is the structural representation of the radio frequency heating apparatus used in this method.
Wherein 1 is high frequency electric source, and 2 is radio frequency adaptation, and 3 is radio-frequency cable, 4 for forming the symmetrical coupled chamber of line focus electromagnetic field, 5 is quartz tube reactor, and 5A is that acetylene gas charges into mouth, and 5B extracts mouth out for the hydrogen mouth, 5C, 5D are that hydrogen charges into mouth, 6 is the acetylene source of the gas, and 6A is a gas flowmeter, and 7 is carbon fiber, 8,9 are transmitting-receiving silk mechanism, and 6C is the gas buffer chamber.
The specific embodiment
Will make surface-treated carbon fiber 7 passes quartz tube reactor 5 and is arranged between the transmitting-receiving silk mechanism 8,9, under powerful focused electromagnetic induction, carbon fiber 7 is heated between 110～1300 ℃, guarantee that by the argon gas that charges between inflation inlet 5C, the 5D external oxygen can not enter reactor 5 this moment, 0.9～1.2 liter acetylene gas enters quartz reactor 5 against the carbon fiber sport direction and per hour sentence by inflation inlet 5A, and contact with carbon fiber under the high temperature and to produce cracking reaction, the free carbon atomic deposition that reaction generates is in the surface and cavity of carbon fiber.The line of travel speed of carbon fiber 7 in quartz reactor is 2～3 meters/minute, can guarantee the reparation purpose in the carbon fiber 7 surface deposition processes effectively.The flow that the two ends argon gas charges into is 0.5 liter/hour.
Can also suitably adjust temperature according to the heavy degree of carbon fiber defective, silk speed and acetylene flow effect to guarantee to repair.
Carbon fiber after process is repaired or its tensile strength of graphite fibre and modulus of elasticity all are significantly improved, and are useful replenishing to the quality control of carbon fiber production technology.
Claims (1)
1, the method for repairing and mending of carbon fiber surface defect, this method is by the special equipment of special-purpose radio-frequency line focus, carbon fiber is heated, it is characterized in that in the quartz tube reactor that carbon fiber moved through, making the reaction environment that an acetylene gas is full of simultaneously in this, generate after the acetylene cracking that carbon atom is deposited on carbon fiber surface and the place, cavity finishes defect mending, process conditions are as follows particularly:
1. use focused electromagnetic that carbon fiber is heated to 1000-1300 ℃, carry out acetylene cracking and carbon atom deposition,
2. the carbon fiber linear velocity of in focused electromagnetic, advancing be 2-3 rice/minute,
3. react required acetylene gas and charge into from the reactor carbon fiber port of export, the amount of charging into be the 0.9-1.2 liter/hour,
4. for guaranteeing that sealing effectiveness charges into 0.5 liter/hour of argon gas in the carbon fiber gateway at reactor two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121070 CN1255592C (en) | 2002-05-31 | 2002-05-31 | Repairing method of carbon fiber surface defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121070 CN1255592C (en) | 2002-05-31 | 2002-05-31 | Repairing method of carbon fiber surface defect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1461829A CN1461829A (en) | 2003-12-17 |
| CN1255592C true CN1255592C (en) | 2006-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02121070 Expired - Fee Related CN1255592C (en) | 2002-05-31 | 2002-05-31 | Repairing method of carbon fiber surface defect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1255592C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8906278B2 (en) | 2009-03-31 | 2014-12-09 | Donghua University | Process of melt-spinning polyacrylonitrile fiber |
| EP2415913B1 (en) | 2009-03-31 | 2017-09-06 | Donghua University | Processes for producing carbon fiber precursor |
| JP6365675B2 (en) * | 2015-07-14 | 2018-08-01 | 三菱ケミカル株式会社 | Carbon material manufacturing method |
| JPWO2017010509A1 (en) * | 2015-07-14 | 2018-06-07 | 三菱ケミカル株式会社 | Carbon material and manufacturing method thereof |
| JP2017020142A (en) * | 2015-07-14 | 2017-01-26 | 三菱レイヨン株式会社 | Carbon fiber and manufacturing method therefor |
| CN105421035B (en) * | 2015-12-15 | 2017-12-01 | 辽宁石油化工大学 | Using the method for sulfuric acid carbonization starch liquid phase deposition processes carbon fiber |
-
2002
- 2002-05-31 CN CN 02121070 patent/CN1255592C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1461829A (en) | 2003-12-17 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060510 |