CN104139533B - Method for inhibiting discharge breakdown of microwave-cured carbon fiber reinforced composite material - Google Patents
Method for inhibiting discharge breakdown of microwave-cured carbon fiber reinforced composite material Download PDFInfo
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- CN104139533B CN104139533B CN201410298188.2A CN201410298188A CN104139533B CN 104139533 B CN104139533 B CN 104139533B CN 201410298188 A CN201410298188 A CN 201410298188A CN 104139533 B CN104139533 B CN 104139533B
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- Prior art keywords
- microwave
- reinforced composite
- gas
- discharge breakdown
- carbon fiber
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/88—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
- B29C70/882—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced partly or totally electrically conductive, e.g. for EMI shielding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
Abstract
The invention discloses a method for inhibiting discharge breakdown of a microwave-cured carbon fiber reinforced composite material. The method is characterized by adopting at least one of the following two methods: one is that a conductive adhesive tape or gas blocking medium is adhered to an area, in which discharge breakdown can happen easily, of the microwave-cured carbon fiber reinforced composite material, so that functions of shielding microwave, dispersing induced current and blocking gas mediums are achieved; the other one is that a vacuum bag for sealing a part made of the microwave-cured carbon fiber reinforced composite material or a sealed heating environment is filled with inert gas or electronegative gas, the pressure of the ambient environment of the part made of the microwave-cured carbon fiber reinforced composite material is reduced by using a vacuuming method, and the highest voltage value required for discharge breakdown is increased. By adopting the method, the phenomenon of carbon fiber discharge breakdown generated in the microwave curing process of the microwave-cured carbon fiber reinforced composite material can be inhibited and eliminated, and the composite material is prevented from being eroded or damaged in the forming process.
Description
Technical field
The present invention relates to a kind of composite thermosets technology, especially one kind solidify composite using heating using microwave
The technology of parts, specifically a kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown.
Background technology
Microwave is a kind of electromagnetic wave with CF, be generally used for radar, communication, environmental remote sensing, medical diagnosis and
The technical fields such as material heating.Material, in the presence of electromagnetic field, is changed into according to electromagnetic field side from original random distribution state
To carrying out orientations polarization.The polarized arrest producing after polarization lags behind one angle of external electric field, leads to and electric field phase
Same electric current produces, and constitutes the power dissipation of material internal, microwave energy is transformed into heat energy, material can be carried out inside and outside equal
Even heating.Its time that is heating and curing is short, temperature is easily controllable, energy consumption is low, is suitable to be molded high-performance composite material structural member, is one
Kind new composite is heating and curing method, has great development prospect.
Simultaneously as carbon fiber has certain conductive capability, microwave field can produce induced-current, induced-current exists
Induction field is produced around the larger carbon fiber of draw ratio.In the stronger region of induction field, it is susceptible between carbon fiber put
Electrical breakdown.Because discharge temp is up to thousands of degree, such phenomenon is directly resulting in composite and vacuum bag ablation, is seriously then making
Obtain composite to burn in former, threaten equipment and operating personnel's life security.At present, how it is showed no both at home and abroad
Solve the report of this difficult problem, as being resolved, microwave curing carbon fibre reinforced composite technique cannot be in work for this difficult problem
It is used widely in industry field.
Content of the invention
The purpose of the present invention is to produce discharge breakdown for producing induced-current in Composite Microwave solidification process,
The problem of impact solidification quality, a kind of method of invention suppression microwave curing carbon fibre reinforced composite discharge breakdown, simultaneously
A kind of structure of corresponding solidification equipment is disclosed.
One of technical scheme is:
A kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown, is characterized in that adopting conductive tape
Or gas barrier medium is pasted onto the region that carbon fibre reinforced composite parts are susceptible to discharge breakdown, play shielding micro-
Ripple, dispersion induced-current and the effect intercepting gas medium；Described conductive tape can bear carbon fibre reinforced composite zero
High temperature when part curing and do not melt or denaturation, its resistivity when 20 DEG C is 8 × 10-4Below ω m；Described gas resistance
Can be flexible high-temperature resistant synthetic rubber adhesive tape or fire resistant resin material every medium, paste or be applied to composite and easily discharge
The region puncturing, the resistivity of gas barrier medium is in more than 10 ω m.
The two of technical scheme are:
A kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown, is characterized in that using inert gas
Or electronegative gas is filled in the vacuum bag of sealing carbon fibre reinforced composite parts or in airtight heating environment, adopt
The method vacuumizing, reduces the air pressure of carbon fibre reinforced composite parts surrounding environment, improves discharge breakdown ceiling voltage
Value；Described inert gas is: one of nitrogen, helium, neon or argon gas or more than one combination, described electronegative gas
For sulfur hexafluoride；Vacuumize pressure value in rear vacuum bag or airtight heating environment between 100pa to 0.0001pa.Closed loop
When border does not vacuumize, between 0.6mpa to 0.1mpa, when vacuumizing, pressure value is between 100pa to 0.0001pa for pressure value.
A kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown, is characterized in that adopting above two
The combination of any one or two kinds of in method is carried out.
Described carbon fibre reinforced composite parts are continuous, the chopped or particle material with carbon element of resin base or ceramic base
Enhanced composite material parts.Resin base comprises: phenolic resin, epoxy resin, bimaleimide resin or polyimides
One of resin or its modified resin；Ceramic base comprises: aluminum oxide, zirconium oxide, silicon nitride, boron nitride, carborundum, zirconium boride
One of or it is modified.
Described microwave frequency is fixed frequency between 300mhz to 300ghz, change frequency, continuous power or arteries and veins
Rush the microwave form of any one or a combination thereof of power.
Beneficial effects of the present invention:
The present invention can suppress and eliminate the carbon fiber that carbon fibre reinforced composite produces during microwave curing to put
Electric breakdown phenomena, it is to avoid ablation in forming process for the composite and breaking-up, protects shaped device, is microwave curing carbon fiber
The commercial Application strengthening composite provides theory and technology to support.
The present invention solves the electric discharge ablation existing when high-performance carbon fibre enhancing composite solidifies in microwave field and asks
Topic, has broad application prospects.
Brief description
Fig. 1 is the structural representation that the present invention no punctures solidification equipment.
In figure: 1 mould, 2 vacuum bags, 3 conductive tapes, 4 material prepregs, 5 vacuumize interface, and 6 inflations connect
Mouthful.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
A kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown, exists mainly for microwave frequency
Between 300mhz to 300ghz, fixed frequency, any one or a combination thereof of change frequency, continuous power and pulse power micro-
Waveshape, carbon fibre reinforced composite parts are the continuous, chopped or granulated carbon Material reinforcement of resin base or ceramic base
Composite material parts.Resin base comprises: in phenolic resin, epoxy resin, bimaleimide resin or polyimide resin
One kind or its modified resin；Ceramic base comprises: in aluminum oxide, zirconium oxide, silicon nitride, boron nitride, carborundum, zirconium boride
Plant or it is modified；Concrete grammar can be carried out using following two any one or two kinds of simultaneously, when carrying out simultaneously general first by the
A kind of method operation is carried out using second method after terminating again.Two methods are respectively as follows:
First method:
It is pasted onto carbon fibre reinforced composite parts using conductive tape or gas barrier medium to be susceptible to discharge
The region puncturing, plays shield microwaves, dispersion induced-current and the effect intercepting gas medium；Described conductive tape can bear
The high temperature during solidification of carbon fibre reinforced composite parts and do not melt or denaturation, its resistivity when 20 DEG C is 8 × 10-4
Below ω m；Described gas barrier medium can be flexible high-temperature resistant synthetic rubber adhesive tape or fire resistant resin material, paste or apply
It is put on the region of the easy discharge breakdown of composite, the resistivity of gas barrier medium is in more than 10 ω m.When being embodied as, lead
Two methods of electric adhesive tape or gas barrier medium also can be adopted using one kind simultaneously.
Second method:
It is filled in the vacuum bag of sealing carbon fibre reinforced composite parts using inert gas or electronegative gas
Or in airtight heating environment, method using vacuumizing, reduce the air pressure of carbon fibre reinforced composite parts surrounding environment,
Improve discharge breakdown maximum voltage value；Described inert gas is: one of nitrogen, helium, neon or argon gas or more than one
Combination, described electronegative gas be sulfur hexafluoride；Vacuumize pressure value in rear vacuum bag or airtight heating environment in 100pa
To 0.0001pa.When being embodied as, inert gas or electronegative gas can individually adopt, and also can adopt simultaneously.
In sum, the present invention actually has four kinds of specific implementations, and they can individually be implemented, and also can be combined
Implement.
It is further described below in conjunction with the accompanying drawings.
As shown in Figure 1.
A kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown, first, the carbon cutting is fine
Dimension reinforced epoxy matrix composite prepreg 4 is laid in mould 1 surface and forms required carbon fiber reinforced plastic
Material parts, paste conductive tape 3 in the region being susceptible to discharge breakdown about, the present embodiment adopts aluminium glue band.Encapsulation
Vacuum bag 2, setting around vacuum bag vacuumizes interface 5 and inflatable interface 6.Vacuum bag area is 0.8 square metre, vacuumizes and connects
Mouth 5 connects high-vacuum pump, and inflatable interface 6 connects inert gas or electronegative gas bottle interface, and the present embodiment adopts nitrogen, gas flow
For 100ml/min.The air-tightness that vacuum bag tested by vavuum pump is first opened, vacuum bag pressure is in 10pa(to control during solidification
It is advisable between 100pa to 0.0001pa) about, and do not decline in 20 minutes.Secondly, gas is filled with packaged vacuum
In bag, control gas flow, after 15 minutes, be then turned on vavuum pump.Vacuumize until vacuum pressure reaches 0.01pa.Now,
Conductive tape is fully compacted the region in the easy discharge breakdown of composite, in microwave field solidify when play shield microwaves and
Faradic effect in dispersed carbon fiber.Under high vacuum and inert gas part, gas is thin, discharge breakdown electric-field strength
Degree improves, and inert gas plays ablation inhibitory action.Three kinds of conditions adopt simultaneously, effectively suppress and eliminate carbon fiber composite
The discharge breakdown of material.Parts quality after solidified forming is intact, bubble-free, through ray detection no internal flaw.
Part that the present invention does not relate to is all same as the prior art or can be realized using prior art.
Claims (2)
1. a kind of method of suppression microwave curing carbon fibre reinforced composite discharge breakdown, is characterized in that first, using conduction
Adhesive tape or gas barrier medium are pasted onto the region that carbon fibre reinforced composite parts are susceptible to discharge breakdown, play screen
Cover microwave, dispersion induced-current and the effect intercepting gas medium；Described conductive tape can bear carbon fiber reinforced plastic
High temperature during material parts solidification and do not melt or denaturation, its resistivity when 20 DEG C is 8 × 10-4Below ω m；Described gas
It can be flexible high-temperature resistant synthetic rubber adhesive tape or fire resistant resin material that body intercepts medium, paste or to be applied to composite easy
The region of discharge breakdown, the resistivity of gas barrier medium is in more than 10 ω m；Secondly, using inert gas or electronegative gas
It is filled in the vacuum bag of sealing carbon fibre reinforced composite parts or in airtight heating environment, reduce fibre reinforced multiple
The air pressure of condensation material parts surrounding environment, improves discharge breakdown maximum voltage value；Described closed environment vacuum-pumping, may not be used yet
Vacuumize；Described inert gas is: one of nitrogen, helium, neon or argon gas or more than one combination, described electronegativity
Gas is sulfur hexafluoride；Vacuumize pressure value in rear vacuum bag or airtight heating environment between 100pa to 0.0001pa；Close
When closed loop border does not vacuumize, pressure value is between 0.6mpa to 0.1mpa, when vacuumizing pressure value 100pa to 0.0001pa it
Between；Described microwave frequency is fixed frequency between 300mhz to 300ghz, change frequency, continuous power or pulse power
Any one or a combination thereof microwave form.
2. method according to claim 1, is characterized in that described carbon fibre reinforced composite parts are resin base
Or the composite material parts of continuous, the chopped or granulated carbon Material reinforcement of ceramic base；Resin base comprises: phenolic resin, epoxy
One of resin, bimaleimide resin or polyimide resin or its modified resin；Ceramic base comprises: aluminum oxide, oxygen
Change one of zirconium, silicon nitride, boron nitride, carborundum, zirconium boride or it is modified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298188.2A CN104139533B (en) | 2014-06-27 | 2014-06-27 | Method for inhibiting discharge breakdown of microwave-cured carbon fiber reinforced composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298188.2A CN104139533B (en) | 2014-06-27 | 2014-06-27 | Method for inhibiting discharge breakdown of microwave-cured carbon fiber reinforced composite material |
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| CN104139533A CN104139533A (en) | 2014-11-12 |
| CN104139533B true CN104139533B (en) | 2017-01-25 |
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| CN104494027B (en) * | 2014-12-17 | 2017-04-05 | 南京航空航天大学 | Double vacuum bag microwave solidification methods of carbon fibre composite product |
| CN104480414B (en) * | 2014-12-17 | 2016-06-01 | 南京航空航天大学 | The microwave forming method of a kind of silicon carbide fibre reinforced metal based composites |
| TWI747668B (en) * | 2020-03-25 | 2021-11-21 | 源川國際股份有限公司 | Manufacturing method of components |
| CN114536617B (en) * | 2022-02-21 | 2023-03-21 | 昆明理工大学 | Method for improving microwave curing heating uniformity of carbon fiber composite material |
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| JPH09283904A (en) * | 1996-04-18 | 1997-10-31 | Matsushita Electric Ind Co Ltd | Creation method for recognition mark in resin screen mask |
| WO2010116407A1 (en) * | 2009-04-07 | 2010-10-14 | 三菱電機株式会社 | Gas insulated device |
| US9221547B2 (en) * | 2010-06-25 | 2015-12-29 | The Boeing Company | Static dissipative fuel tank coatings and methods |
| CN102329579A (en) * | 2011-08-09 | 2012-01-25 | 常熟市长江胶带有限公司 | Polyester aluminum-coated adhesive tape |
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