CN105479768B - The resistance electrical heating curing certainly of resin-based carbon fiber composite - Google Patents
The resistance electrical heating curing certainly of resin-based carbon fiber composite Download PDFInfo
- Publication number
- CN105479768B CN105479768B CN201510817586.5A CN201510817586A CN105479768B CN 105479768 B CN105479768 B CN 105479768B CN 201510817586 A CN201510817586 A CN 201510817586A CN 105479768 B CN105479768 B CN 105479768B
- Authority
- CN
- China
- Prior art keywords
- carbon fiber
- resin
- preform
- based carbon
- mrow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- 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
-
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A kind of resistance electrical heating curing certainly of resin-based carbon fiber composite, provides the heat needed for resin solidification by the way of electrified regulation carbon fiber, and the pressure forming provided in combination with pressurized tank is final to obtain required part.Electrically heated mode is applied in fiber-reinforced composites by the present invention, to resin-based carbon fiber composite preform electrified regulation, the temperature of preform is controlled by way of controlling source current, the temperature of this mode of heating is easily controllable, heat time is short, the efficiency of heating surface is high, and can improve the profiling temperatures of preform when being heating and curing, the final resin-based carbon fiber composite part for obtaining quality and meeting to require.
Description
Technical field
The present invention relates to the research field that is heating and curing of composite, specifically a kind of resin-based carbon fiber composite
From resistance electrical heating curing.
Background technology
Advanced composite material is widely used in because it has the series of advantages such as specific strength, specific stiffness height and light weight
Aero-Space, the energy, traffic and biomedical sector.In general advanced composite material be by high-volume fractional fiber and
High temperature resin system is combined, and fiber is the component for strengthening composite material rigidity and intensity, and the content of fiber is higher, structure
Strength and stiffness it is bigger.Resin-based carbon fiber composite is referred to using carbon or graphite fibre as reinforcement, and and resin
It is combined, wherein the performance of carbon fiber is good, fiber type and specification are more, moderate cost, while carbon fiber is also one
The preferable conductive filler of kind, can be issued to very high electric conductivity, therefore resin-based carbon fiber composite wood in the loading of very little
Material has higher electric conductivity, can be using this characteristic to composite preform in being heating and curing of composite
Carry out electrified regulation solidification.
Because carbon fiber is conductive material, resin is insulator, therefore the resin completed by the way of being powered to laying
Base carbon fibre prepreg overlay is carried out from during resistance heating, and electric current can only produce joule from carbon fiber by and by self-resistance
Heat, then transfer heat to the resin of surrounding.For resin-based carbon fiber composite, its process solidified is exactly to shape
Process, this process can be divided into three phases, and first stage is the temperature rise period, and second stage is holding stage, the 3rd
Stage is temperature-fall period.In the temperature rise period, the temperature of resin-based carbon fiber preform is gradually increasing, with the rising tree of temperature
The mobility enhancing of fat, now the carbon fiber in resin-based carbon fiber preform is sufficiently wet by the resin, and resin base carbon is fine
The pressure on dimension prepreg surface keeps the pressure value of maximum constant after then rapidly rising to maximum in a short time；In insulation rank
Section, the maximum that the pressure holding temperature rise period reaches is constant, and the pressure now applied to composite can extrude out preform
In air, remove space and realize being uniformly distributed for fiber；In temperature-fall period, closing power supply makes resin-based carbon fiber prepreg
Temperature be gradually brought to room temperature, finally give satisfactory resin-based carbon fiber composite part.
Chinese patent CN 1730203A (metal-based composite material by electric current direct heating dynamic sinter hot pressing method for preparing and dress
Put) the electric current direct heating dynamic sinter hot pressing preparation facilities of metal-base composites a kind of is described, it includes specimen current heating hot press sintering
Dynamic sinter hot pressing furnace, hot pressed sintering mould, hot pressed sintering mould are made up of straight carbon steel housing, mould, ceramic insulating layer.The hair
It is bright to make electric current by product without by mould, causing material self-resistance to generate heat by high current, utilizing electricity in sintering process
The feature of stream and the relation for being sintered material temperature, and complete sintering process in the feature short time for passing through control electric current.So
And this device is only applicable to powder sintered mode and shapes metal-base composites, and it is not applied for carbon fiber composite
Material is heating and curing.Generally for carbon fibre composite, traditional mode of being heating and curing is mainly heat transfer and heat radiation, this
The heat time length of kind mode of heating, heat transfer speed are slow.Therefore, it is necessary to which one kind is suitable for resin-based carbon fiber composite
The method that is heating and curing, grown to solve in traditional heating mode the heat time, the problems such as heat transfer speed is slow and cost is high,
Solidified forming mass meets desired resin-based carbon fiber composite by the way of electrified regulation.
The content of the invention
Existing deficiency during for conventional curing formed composite material, solves heat time length in traditional heating mode, heat
The problem of amount transmission speed is slow, and cost is high, the present invention propose a kind of adding from resistance electricity for resin-based carbon fiber composite
Thermal curing methods.
The present invention detailed process be：
Step 1, surface clean；By the tree at the both ends for cleaning the resin-based carbon fiber prepreg long side for removing each rectangle
Fat, the carbon fiber at the resin-based carbon fiber prepreg both ends is exposed, for burying electrode.The length of cleaning is 10~
15mm；The quantity of the resin-based carbon fiber prepreg is even number.
Step 2, laying resin-based carbon fiber prepreg.Each resin-based carbon fiber prepreg through over cleaning is spread
It is folded, and make laying in 90 ° between adjacent two layers of resin base carbon fibre prepreg, until by all resin-based carbon fiber prepregs
Laying is complete, obtains resin-based carbon fiber prepreg preform.When pawnshop is stacked to laying in the middle part of preform, in two layers of resin base
Two are placed between carbon fiber prepreg and scribbles the electrode of conductive paste, and it is pre- described two electrodes is respectively positioned on resin-based carbon fiber
The both ends of leaching material long side.The wire of the electrode is drawn.The preform is spread using resin-based carbon fiber prepreg
It is folded.
Step 3, frock prepares.One layer of insulating materials is laid in the die surface of " C " the shape part；Electricity is laid by above-mentioned
The resin-based carbon fiber prepreg preform of pole is placed on the insulating materials；In resin-based carbon fiber prepreg preform
Upper surface is equidistantly placed with three thermocouples, and each thermocouple is connected with temperature controller respectively.
Using vacuum bag assembled unit by above-mentioned resin-based carbon fiber preform, electrode, mould and the thermoelectricity laid
It is even to be sealed according to prior art, the air in bag is extracted until being put into after vacuum state in pressurized tank, and power supply is positioned at pressure
The outside of power tank, it is connected by wire with the electrode in pressurized tank inner vacuum bag.
The vacuum bag assembled unit includes vacuum bag, airfelt, inhales glue material and have hole barrier film.Mould is placed in very
Bottom in empty bag, insulating materials and airfelt are laid successively in the upper surface of the mould；By resin-based carbon fiber prepreg in advance into
Body is placed on the upper surface of airfelt.In the upper surface of the airfelt, glue material is inhaled in laying；In the upper of the suction glue material
Surface re-lays second layer airfelt.By the upper surface for thering is hole barrier film to be laid on second layer airfelt.Complete above-mentioned paving
If after, vacuum bag is sealed with fluid sealant.
Step 4, it is determined that the parameter that is heating and curing.The parameter that is heating and curing includes resin-based carbon fiber prepreg preform
Resistance and the intensity by resin-based carbon fiber prepreg preform electric current.
The resistance R of resin-based carbon fiber prepreg preform is determined by formula 1：
The intensity I of resin-based carbon fiber prepreg preform electric current is determined by formula 2 and 3
∵I2R=ε A1·σ·(T1 4-T2 4)=ε Lx·Ly·σ·(T1 4-T2 4) (2)
∴
Wherein, R is the resistance of resin-based carbon fiber preform, ρfIt is the resistivity of carbon fiber, LxIt is the length of preform
Degree, VfIt is the volume fraction of carbon fiber, LyIt is the width of preform, e0It is the gross thickness of preform laying, I is to need to set
The fixed current strength by resin-based carbon fiber preform, ε are the emissivity of resin-based carbon fiber preform, A1It is pre-
The cooling surface area of formed body, σ are this special fence-Bo Erciman constants, T1It is that preform is expected holding temperature, T2It is laboratory
Room temperature.Step 5, electrified regulation solidifies.According to the parameter that is heating and curing of determination, resin-based carbon fiber prepreg preform is led to
Enter the DC current of determination, resin-based carbon fiber prepreg preform is warming up to 170 with 2~5 DEG C/min heating rate
~190 DEG C；Start to be incubated when being heated up to 170~190 DEG C.It is alive simultaneously, vacuumize and be forced into 0.4 to pressurized tank~
0.6MPa, pressure is applied to resin-based carbon fiber prepreg preform.Closed after the pressure of pressurized tank reaches 0.4~0.6MPa
Gas valve pressurize is closed, makes the pressure on preform surface keep the pressure constant until completing being solidified into for composite
Shape.
The temperature of preform is monitored and recorded with temperature controller simultaneously.
Step 6, resin-based carbon fiber composite part is taken out.Power supply is closed, the pressure in unloading pressure tank, with 2~5
DEG C/min rate of temperature fall is to the greenhouse cooling for treating preform to room temperature.After discharge degree, pressurized tank is opened, from
The resin-based carbon fiber composite part of solidification is taken out in vacuum bag.
The present invention provides the heat needed for resin solidification by the way of electrified regulation carbon fiber, is carried in combination with pressurized tank
The pressure forming of confession, it is final to obtain required part.
Electrically heated mode is applied in fiber-reinforced composites by the present invention, to resin-based carbon fiber composite wood
Expect preform electrified regulation, the temperature of preform is controlled by way of controlling source current, this mode of heating
Temperature is easily controllable, and the heat time is short, and the efficiency of heating surface is high, and can improve the Temperature Distribution feelings of preform when being heating and curing
Condition, the final resin-based carbon fiber composite part for obtaining quality and meeting to require.
The process of resin-based carbon fiber composite solidification is the forming process of material, is answered preparing resin-based carbon fiber
Laying is first carried out using resin-based carbon fiber prepreg during condensation material, then the resin-based carbon fiber prepreg that laying is completed spread
Layer carries out compacting solidification, and process of this compacting solidification mainly includes three phases, and first stage is the temperature rise period, second
Stage is holding stage, and three phases are temperature-fall period.In the temperature rise period, the temperature of resin-based carbon fiber preform is gradual
Rise, the mobility with the rising resin of temperature strengthens, and now the carbon fiber in preform is sufficiently wet by the resin, and is set
The pressure on aliphatic radical carbon fiber prepreg surface keeps the pressure value of maximum constant after then rapidly rising to maximum in a short time；
In holding stage, the maximum that the pressure holding temperature rise period reaches is constant, and now resin-based carbon fiber composite is applied
Pressure can extrude out air in preform, remove space and realizes being uniformly distributed for fiber；In temperature-fall period, power supply is closed
The temperature of resin-based carbon fiber prepreg is gradually brought to room temperature, finally give the resin-based carbon fiber composite zero of requirement
Part.
Preform carries out laying using resin-based carbon fiber prepreg in the present invention, while cleans this using acetone soln
The both ends of a little prepregs, because resin is dissolved in acetone soln, therefore acetone soln can be by resin-based carbon fiber prepreg long side two
The resin at end washes away, and the length for often holding cleaning is 10mm, and this 10mm carbon fiber is exposed.With this treated preimpregnation
Material carries out laying, and the prepreg completed is laid as the preform in the present embodiment according to above-mentioned requirements.Meanwhile in intermediate layer
Prepreg between bury electrode, the electrode for scribbling conductive paste is embedded in the both ends of prepreg long side respectively, exposed to preimpregnation
Electrode on the outside of material laying is connected by wire with power supply.In the burial place of electrode, electrode directly contacts with carbon fiber, and will
Electric current passes to carbon fiber, and carbon fiber produces Joule heat in the presence of electric current and self-resistance, while will be hot caused by itself
Amount passes to the resin of surrounding, promotes resin-based carbon fiber that a series of reaction occurs.
The preform carries out laying using resin-based carbon fiber prepreg, and these prepregs are cleaned using acetone soln
Both ends, because resin is dissolved in acetone soln, therefore resin-based carbon fiber prepreg can be located at long side both ends by acetone soln
Resin washes away, and carbon fiber is exposed.Laying is carried out with this treated prepreg, obtains required preform.
When in use, the prepreg completed is laid as the preform in the present embodiment using according to above-mentioned requirements.Pre-
The both ends of formed body are embedded with two electrodes respectively, and the positive pole of power supply, negative pole are connected with two electrodes in preform respectively.
Above-mentioned preform is laid on mould together with embedded electrode, wherein, one layer is equipped between mould and preform
Insulating materials, to prevent from electric current in preform from causing by mould being heating and curing result undesirable.Preform upper berth
There is thermocouple to be connected to monitor temperature change with temperature controller.Above-mentioned preform, electrode, mould and thermocouple are sealed
In vacuum bag assembled unit, the air in bag is extracted until being put into after vacuum in pressurized tank, is pressurizeed by pressure pot equipment, with
And power supply is to the electrified regulation of composite.During heating, the temperature of preform is monitored using temperature controller, with
The parameter of power supply is conveniently adjusted, required shape is obtained and meets the part of quality requirement.
Carbon fiber in the preform is conductive material, and resin is insulator, therefore to paving by the way of being powered
If the preform completed is carried out from during resistance heating, electric current only from carbon fiber by and produce Joule heat, while carbon fiber will
Joule heat caused by itself passes to the resin of surrounding.
Compared with prior art, the present invention has the following effects that：
It is fine using carbon present approach provides a kind of method that is heating and curing for being suitable for resin-based carbon fiber composite
The electric conductivity of dimension, the both ends of composite preform being powered, carbon fiber produces Joule heat in the presence of electric current, and by heat
Amount passes to the resin of surrounding, and the heat time of this electrified regulation mode is short, and the sensitivity of heating-up temperature is high, and can lead to
Cross and change the size of electric current and change the heating-up temperature of composite preform.In resin-based carbon fiber composite preform
In the solidification process of body, temperature curve is easily controllable, so as to control the solidified forming effect of composite, shapes mass
Meet desired resin-based carbon fiber part.
The inventive method heats carbon fiber by the way of being powered, and the elevated carbon fiber of temperature passes to the temperature of itself
The resin of surrounding, the annulus temperature gradient that the resin around carbon fiber is formed centered on carbon fiber cross section are fine close to carbon
The resin of dimension first solidifies, while also improves carbon fiber and the solidification quality at resin-bonded, what this curing mode shaped
The fracture toughness of resin-based carbon fiber composite is higher.
The inventive method uses the mode of electrified regulation to provide heat for the solidification of composite, with hot pressing can shaping phase
Than this electrically heated mode shortens the production cycle, and the main energy of in general hot pressing can shaping and time loss are compound
In terms of the heating of material, solidification process generally requires more than 5 hours, and when by the way of electrified regulation, resin-based carbon fiber
Only need to provide pressure in the solidified forming of composite, solidification process only needs 180 minutes, and this saves on composite
Production cycle.Simultaneously traditional mode of heating is that ecto-entad transmits heat, and heat is concentrated mainly on zero in heating process
Part upper surface, over time, the temperature difference on the upper and lower surface of part be up to 10 DEG C this result in part in thickness direction
Larger residual stress is produced, usual residual stress is in 48MPa, and it is by interior to use the mode of heating heat being powered to carbon fiber
Outwards transmit, because carbon fiber is evenly distributed in the inside of part, this each position for allowing for part is heated evenly, zero
For the temperature difference of the upper and lower surface of part and inside parts within 2 DEG C, the remnants in the resin-based carbon fiber part finally given should
Power is generally in 30MPa, so that part is not susceptible to warpage and deformation.
Brief description of the drawings
Fig. 1 is from resistance electrical heating solidified forming apparatus structure schematic diagram in the present invention.
Fig. 2 is the structural representation in resin-based carbon fiber section in the present invention.
Fig. 3 is the structural representation of vacuum bag assembled unit in the present invention.
Fig. 4 is the position relationship schematic diagram of material prepreg and electrode in the present invention.
Fig. 5 is that temperature changes with time matched curve composite in the curing process in the present invention.
Fig. 6 is the flow chart of the present invention.
Wherein：1. pressurized tank；2. mould；3. preform；4. thermocouple；5. vacuum bag assembled unit；6. temperature control
Device；7. electrode；8. power supply；9. carbon fiber；10. resin；11. vacuum bag；12. airfelt；13. inhale glue material；14. there is hole isolation
Film；15. fluid sealant；16. conductive paste；17. insulating materials.
Embodiment
The present embodiment is a kind of resistance electrical heating curing certainly of resin-based carbon fiber composite.Part formed thereby is
" C " shape part.The size of the resin-based carbon fiber prepreg used in the present embodiment is 1000mm × 300mm × 0.2mm, carbon fiber
Volume fraction be 0.6, the resistivity of carbon fiber is 1.7 × 10-2Ω·mm2, resin-based carbon fiber composite solidification temperature
180℃。
Described from resistance electrical heating solidification is implemented by pressurized tank to resin-based carbon fiber composite, and specific steps are such as
Under：
Step 1, surface clean.Acetone soln is used at the both ends of the resin-based carbon fiber prepreg long side of multi-disc rectangle respectively
Cleaned, wash away the resin 10 at prepreg both ends, the length for often holding cleaning is 10~15mm, makes the resin-based carbon fiber pre-
The carbon fiber 9 at leaching material both ends is exposed, to bury electrode 7.In the present embodiment, the resin-based carbon fiber prepreg both ends
Cleaning length be 10mm.
Step 2, laying resin-based carbon fiber prepreg.During to each resin-based carbon fiber prepreg overlay, it will pass through
Each resin-based carbon fiber prepreg of cleaning carries out laying, and makes in 90 ° between adjacent two layers of resin base carbon fibre prepreg
Laying, until all resin-based carbon fiber prepreg layings are complete, obtain resin-based carbon fiber prepreg preform 3.Pawnshop
When in the middle part of layer to preform, two electrodes 7 for scribbling conductive paste 16 are placed between two layers of resin base carbon fibre prepreg, and
Described two electrodes 7 are made to be respectively positioned on the both ends of resin-based carbon fiber prepreg long side；The wire of the electrode is drawn.This implementation
In example, the resin-based carbon fiber prepreg is 20 layers.Described two electrodes 7 are fine with the resin base carbon of eleventh floor positioned at the tenth layer
Between dimension prepreg.
Step 3, frock prepares.One layer of insulating materials 17 is laid on the surface of mould 2 of " C " the shape part；By above-mentioned placement
The resin-based carbon fiber prepreg preform for having electrode is placed on the insulating materials；Resin-based carbon fiber prepreg in advance into
Body upper surface is equidistantly placed with three thermocouples 4, and each thermocouple is connected with temperature controller 6 respectively.
Using vacuum bag assembled unit 5 by above-mentioned the resin-based carbon fiber preform laid, electrode 7, mould 2 and heat
Galvanic couple 4 is sealed according to prior art, extracts the air in bag until being put into after vacuum state in pressurized tank 1, power supply 8
In the outside of pressurized tank, it is connected by wire with the electrode in pressurized tank inner vacuum bag.
The vacuum bag assembled unit 5 includes vacuum bag 11, airfelt 12, inhales glue material 13 and have hole barrier film 14.Will
Mould 2 is placed in the inner bottom part of vacuum bag 11, and insulating materials 17 and airfelt 12 are laid successively in the upper surface of the mould；By resin base
Carbon fiber prepreg preform is placed on the upper surface of airfelt 12.In the upper of the resin-based carbon fiber prepreg preform
Glue material 13 is inhaled in surface laying；Second layer airfelt is re-layed in the upper surface of the suction glue material.There is hole barrier film 14 by described
It is laid on the upper surface of second layer airfelt.After completing above-mentioned laying, vacuum bag assembled unit 5 is sealed with fluid sealant 15.
Step 4, it is determined that the parameter that is heating and curing.The parameter that is heating and curing includes resin-based carbon fiber prepreg preform
Resistance and the intensity by resin-based carbon fiber prepreg preform electric current.
Before electrified regulation, it is necessary to calculate preform resistance size and set by resin-based carbon fiber in advance into
The intensity of body electric current.The size of resistance can be according to the resistivity of carbon fiber, the volume fraction of carbon fiber and preform
Size determine.According to Thermodynamics Formulas, the intensity of electric current can be according to the resistance of preform, emissivity, this special fence-Bo Er
The graceful constant of thatch, geomery and expected holding temperature determine that physical relationship formula is seen below shown in formula.
∵I2R=ε A1·σ·(T1 4-T2 4)=ε Lx·Ly·σ·(T1 4-T2 4) (2)
∴
Wherein, R is the resistance of resin-based carbon fiber preform, ρfIt is the resistivity of carbon fiber, LxIt is the length of preform
Degree, VfIt is the volume fraction of carbon fiber, LyIt is the width of preform, e0It is the gross thickness of preform laying, I is to need to set
The fixed current strength by resin-based carbon fiber preform, ε are the emissivity of resin-based carbon fiber preform, A1It is pre-
The cooling surface area of formed body, σ are this special fence-Bo Erciman constants, T1It is that preform is expected holding temperature, T2It is laboratory
Room temperature.
By above-mentioned formula calculate can obtain, in the present embodiment the resistance of preform be 0.024 Ω, it is necessary to electricity
Stream size is 152A.
Step 5, electrified regulation solidifies.According to the parameter that is heating and curing of determination, to resin-based carbon fiber prepreg preform
Body is passed through the DC current of determination, resin-based carbon fiber prepreg preform is warming up to 2~5 DEG C/min heating rate
170~190 DEG C；Start to be incubated when being heated up to 170~190 DEG C.It is alive simultaneously, vacuumize and pressurized tank be forced into
0.4~0.6MPa, pressure is applied to resin-based carbon fiber prepreg preform.When the pressure of pressurized tank reaches 0.4~
Gas valve pressurize is closed after 0.6MPa, makes the pressure on preform surface keep the pressure constant until completing composite
Solidified forming.In the present embodiment, resin-based carbon fiber prepreg preform is warming up to 2.5 DEG C/min heating rate
180 DEG C, vacuumize and 0.5MPa is forced into pressurized tank.
The temperature of resin-based carbon fiber prepreg preform is monitored and recorded with temperature controller simultaneously.
Step 6, resin-based carbon fiber composite part is taken out.Power supply is closed, the pressure in unloading pressure tank, is made described
Resin-based carbon fiber prepreg preform is cooled to room temperature with 2~5 DEG C/min rate of temperature fall.After discharge degree, beat
Pressurized tank is driven, the resin-based carbon fiber composite part of solidification is taken out from vacuum bag.In the present embodiment, described cooling speed
Rate is 2.5 DEG C/min.
Laying is carried out using resin-based carbon fiber prepreg in the present embodiment, resin-based carbon fiber prepreg is referred to carbon
In the neat immersion resin solution of fiber alignment, through semi-finished product made of drying after dipping.The resin base used in the present embodiment
The size of carbon fiber prepreg is 1000mm × 300mm × 0.2mm, and the both ends of prepreg long side are cleaned using acetone soln, by
Acetone soln is dissolved in resin, therefore acetone soln can wash away the resin at resin-based carbon fiber prepreg long side both ends, often hold
The length of cleaning is 10mm, and laying is carried out with this treated prepreg, lays 20 layers altogether, lays and completes according to above-mentioned requirements
Resin-based carbon fiber prepreg as the preform in the present embodiment.Meanwhile at the tenth layer between eleventh floor prepreg
Laying scribbles the electrode of conductive paste, and the both ends that positive pole and negative electrode are laid on to prepreg long side respectively are connected by wire and power supply
Connect.In the paving location of electrode, electrode is directly contacted with carbon fiber, and electric current passed into carbon fiber, carbon fiber in electric current and
Produce Joule heat in the presence of self-resistance, while by resin of the heat transfer to surrounding caused by itself, promote resin base carbon
Fibrous composite solidified forming.
The above-mentioned resin-based carbon fiber preform laid and electrode are laid on mould, for using electrically heated
Mode solidified forming composite, one layer of insulating materials need to be laid between resin-based carbon fiber prepreg and mould, with to prevent
Only the electric current in preform passes through mould.The thermode of three thermocouples is laid on mould and fixed at equal intervals,
Its other end is drawn and is connected on temperature controller, temperature controller is connected with power supply again, is adjusted by the change of monitoring temperature
The parameter of power supply.Above-mentioned preform, electrode, mould, thermocouple are sealed using vacuum bag assembled unit, extract bag
In air until being put into after vacuum state in pressurized tank, power supply be located at the outside of pressurized tank, by inside wire and pressurized tank
Electrode connection in vacuum bag, preform pressurize by pressure pot equipment, and power supply heating, at the same time, using thermoelectricity
Even summation temperature controller monitors temperature change of the preform in galvanization, adjusts the parameter of power supply in time, completes material
Curing reaction, obtain needed for shape and meet the component of quality requirement.
The pressurized tank 1 is prior art.
The mould 2 is rectangular parallelepiped structure, primarily serves the effect of support preform, is made of No. 45 steel, its chi
Very little size is 1020mm × 320mm × 8mm.
The preform 3 carries out laying using resin-based carbon fiber prepreg, the prepreg used in the present embodiment
Size is 1000mm × 300mm × 0.2mm, and because resin is dissolved in acetone soln, therefore acetone soln can be by resin-based carbon fiber
The resin at prepreg long side both ends washes away, and the length for often holding cleaning is 10mm, and this 10mm carbon fiber is exposed.Passed through with this
The prepreg for crossing processing carries out laying, lays 20 layers altogether, and it is in the present embodiment that the prepreg completed is laid according to above-mentioned requirements
Preform 3, the size for being apparent from preform 3 in the present embodiment is 1000mm × 300mm × 4mm.
The thermocouple 4 is K-type thermocouple, and it is a kind of temperature sensor.
The vacuum bag assembled unit 5 is prior art.Including vacuum bag 11, airfelt 12, inhale glue material 13, have
Hole barrier film 14, fluid sealant 15 etc..Specific operating procedure is that insulating materials paving 17 is placed on mould first, then successively will
Airfelt 12, preform 3, inhale glue material 13, there is hole barrier film 14, vacuum bag 11 to be laid on insulating materials 17, simultaneously will
Four sides of vacuum bag use the good seal of fluid sealant 15, after the completion of extract vacuum bag in air, it is basically reached vacuum shape
State, the solidified forming for composite product.
The working power of temperature controller 6 is 220V/50Hz, 0~1300 DEG C of temperature-measuring range.
The electrode 7 is made of red copper, is rectangle laminated structure, and the length of the electrode 7 is more than the width of prepreg,
In order to which electric current to be transmitted to the carbon fiber in prepreg.In the present embodiment, the distance between described two electrodes are 980mm, electricity
The length of pole is 320mm, width 10mm, thickness 1mm.
The power supply 8 is 12V/200A Switching Power Supplies, power output 2400W.
The carbon fiber 9 and resin 10 use prior art.The vacuum bag 11 uses nylon vacuum bag, for sealing
Resin-based carbon fiber preform and mould form vacuum.
The airfelt 12 and glue material 13 are using felt and the mixed goods of glass fibre.
It is described to there is hole barrier film 14 to use teflon fabric.
The fluid sealant 15 uses silicon rubber sealant.
The conductive paste 16 uses high-efficient electrical contacts conductive paste.
The insulating materials 17 uses polytetrafluoroethylene (PTFE).
When in use, the resin-based carbon fiber prepreg completed is laid as pre- in the present embodiment using according to above-mentioned requirements
Formed body 3.Two electrodes for scribbling conductive paste 16 7 are covered with the both ends of the long side of preform 3, by the positive pole of power supply 8 and are born
Pole is connected with two electrodes 7 in preform 3 by wire respectively.Above-mentioned preform 3 is spread together with the electrode 7 of laying
It is placed on mould 2, wherein, one layer of insulating materials 17 is covered between mould 2 and preform 3, to prevent in preform 3
Electric current passes through mould 2, and the result that causes to be heating and curing is undesirable.Three thermocouples 4 are covered with preform 3 at equal intervals, are adopted
Above-mentioned preform 3, electrode 5, mould 2, thermocouple 4 are sealed according to prior art with vacuum bag assembled unit 5, taken out
The air in vacuum bag is taken until being put into after vacuum in pressurized tank 1, is pressurizeed by pressure pot equipment, and power supply is to resin base carbon
Fibrous composite hinders electrical heating certainly.During heating, the temperature of preform is monitored using temperature controller 6, so as to
In the parameter of adjustment power supply, obtain required shape and meet the resin-based carbon fiber composite part of quality requirement.
Carbon fiber in the preform 3 is conductive material, and resin is insulator, therefore to paving by the way of being powered
If the preform completed is carried out from during resistance heating, electric current only from carbon fiber by and produce Joule heat, while carbon fiber will
Resin of the heat transfer to surrounding caused by itself.
Claims (2)
1. a kind of resin-based carbon fiber composite from resistance electrical heating curing, it is characterised in that detailed process is：
Step 1, surface clean；By the resin at the both ends for cleaning the resin-based carbon fiber prepreg long side for removing each rectangle, make
The carbon fiber at the resin-based carbon fiber prepreg both ends is exposed, for burying electrode；The length of cleaning is 10~15mm；
The quantity of the resin-based carbon fiber prepreg is even number；
Step 2, laying resin-based carbon fiber prepreg；Each resin-based carbon fiber prepreg through over cleaning is subjected to laying, and
Make laying in 90 ° between adjacent two layers of resin base carbon fibre prepreg, until by all resin-based carbon fiber prepreg layings
It is complete, obtain resin-based carbon fiber prepreg preform；It is fine in two layers of resin base carbon when pawnshop is stacked to laying in the middle part of preform
Two are placed between dimension prepreg and scribbles the electrode of conductive paste, and described two electrodes is respectively positioned on resin-based carbon fiber prepreg
The both ends of long side；The wire of the electrode is drawn；The preform carries out laying using resin-based carbon fiber prepreg；
Step 3, frock prepares；One layer of insulating materials is laid in the die surface of workpiece；By the above-mentioned resin base for laying electrode
Carbon fiber prepreg preform is placed on the insulating materials；It is equidistant in resin-based carbon fiber prepreg preform upper surface
Three thermocouples are placed with, each thermocouple is connected with temperature controller respectively；
Using vacuum bag assembled unit by above-mentioned resin-based carbon fiber preform, electrode, mould and the thermocouple laid by
It is sealed according to prior art, extracts the air in bag until being put into after vacuum state in pressurized tank, power supply is located at pressurized tank
Outside, be connected by wire with the electrode in pressurized tank inner vacuum bag；
Step 4, it is determined that the parameter that is heating and curing；The parameter that is heating and curing includes the electricity of resin-based carbon fiber prepreg preform
Resistance and the intensity by resin-based carbon fiber prepreg preform electric current；
Step 5, electrified regulation solidifies；According to the parameter that is heating and curing of determination, resin-based carbon fiber prepreg preform is led to
Enter the DC current of determination, resin-based carbon fiber prepreg preform is warming up to 170 with 2~5 DEG C/min heating rate
~190 DEG C；Start to be incubated when being heated up to 170~190 DEG C；It is alive simultaneously, vacuumize and be forced into 0.4 to pressurized tank~
0.6MPa, pressure is applied to resin-based carbon fiber prepreg preform；Closed after the pressure of pressurized tank reaches 0.4~0.6MPa
Gas valve pressurize is closed, makes the pressure on preform surface keep the pressure constant until completing being solidified into for composite
Shape；
The temperature of preform is monitored and recorded with temperature controller simultaneously；
Step 6, resin-based carbon fiber composite part is taken out；Close power supply, the pressure in unloading pressure tank, with 2~5 DEG C/
Min rate of temperature fall is to the greenhouse cooling of the resin-based carbon fiber prepreg preform to room temperature；After discharge degree,
Pressurized tank is opened, the resin-based carbon fiber composite part of solidification is taken out from vacuum bag.
2. the resistance electrical heating curing certainly of resin-based carbon fiber composite as claimed in claim 1, it is characterised in that pass through
Formula 1 determines the resistance R of resin-based carbon fiber prepreg preform：
<mrow>
<mi>R</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>&rho;</mi>
<mi>f</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>L</mi>
<mi>x</mi>
</msub>
</mrow>
<mrow>
<msub>
<mi>V</mi>
<mi>f</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>L</mi>
<mi>y</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>e</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
The intensity I of resin-based carbon fiber prepreg preform electric current is determined by formula 2 and 3
∵I2R=ε A1·σ·(T1 4-T2 4)=ε Lx·Ly·σ·(T1 4-T2 4) (2)
<mrow>
<mover>
<mrow>
<mo>&CenterDot;</mo>
<mo>&CenterDot;</mo>
</mrow>
<mo>&CenterDot;</mo>
</mover>
<mi>I</mi>
<mo>=</mo>
<msqrt>
<mfrac>
<mrow>
<mi>&epsiv;</mi>
<mo>&CenterDot;</mo>
<msub>
<mi>L</mi>
<mi>x</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>L</mi>
<mi>y</mi>
</msub>
<mo>&CenterDot;</mo>
<mi>&sigma;</mi>
<mo>&CenterDot;</mo>
<mrow>
<mo>(</mo>
<mrow>
<msup>
<msub>
<mi>T</mi>
<mn>1</mn>
</msub>
<mn>4</mn>
</msup>
<mo>-</mo>
<msup>
<msub>
<mi>T</mi>
<mn>2</mn>
</msub>
<mn>4</mn>
</msup>
</mrow>
<mo>)</mo>
</mrow>
</mrow>
<mi>R</mi>
</mfrac>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, R is the resistance of resin-based carbon fiber preform, ρfIt is the resistivity of carbon fiber, LxIt is the length of preform,
VfIt is the volume fraction of carbon fiber, LyIt is the width of preform, e0It is the gross thickness of preform laying, I needs to set
By the current strength of resin-based carbon fiber preform, ε is the emissivity of resin-based carbon fiber preform, A1It is preform
The cooling surface area of body, σ are this special fence-Bo Erciman constants, T1It is that preform is expected holding temperature, T2It is laboratory room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510817586.5A CN105479768B (en) | 2015-11-23 | 2015-11-23 | The resistance electrical heating curing certainly of resin-based carbon fiber composite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510817586.5A CN105479768B (en) | 2015-11-23 | 2015-11-23 | The resistance electrical heating curing certainly of resin-based carbon fiber composite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105479768A CN105479768A (en) | 2016-04-13 |
| CN105479768B true CN105479768B (en) | 2018-03-27 |
Family
ID=55667199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510817586.5A Active CN105479768B (en) | 2015-11-23 | 2015-11-23 | The resistance electrical heating curing certainly of resin-based carbon fiber composite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105479768B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716964A (en) * | 2016-04-28 | 2016-06-29 | 中南大学 | Sealed electric conduction device capable of guiding pulse current into autoclave and sealed electronic conduction method capable of guiding pulse current into autoclave |
| CN106671451B (en) * | 2016-06-08 | 2019-08-23 | 中国科学院苏州纳米技术与纳米仿生研究所 | Fibre reinforced composites, preparation method and application |
| CN107584779A (en) * | 2016-07-08 | 2018-01-16 | 深圳光启高等理工研究院 | The female mould forming method of composite product |
| CN106738523B (en) * | 2016-12-27 | 2018-09-11 | 北京航空航天大学 | The resistance heating quick molding method of long fibre and continuous fiber reinforced thermoplastic composite material |
| CN106863846B (en) * | 2016-12-30 | 2019-04-02 | 中国科学院长春光学精密机械与物理研究所 | A kind of high pressure temperature equalization system being used to prepare carbon fiber part |
| CN107116810A (en) * | 2017-05-18 | 2017-09-01 | 张彤 | A kind of carbon fibre composite self-curing forming technique |
| CN110757831A (en) * | 2018-09-27 | 2020-02-07 | 山东非金属材料研究所 | Resistance heating forming method of carbon fiber reinforced high-performance thermoplastic composite material |
| CN109760337A (en) * | 2018-12-27 | 2019-05-17 | 西安交通大学 | A kind of electrical heating type thermoplastic composite fiber placement molding machine and method |
| CN109827995B (en) * | 2019-01-17 | 2021-07-16 | 南京航空航天大学 | Online self-monitoring method for curing degree of resin-based composite material |
| CN109648895B (en) * | 2019-01-25 | 2020-10-02 | 南京航空航天大学 | Rapid in-situ forming method of conductive fiber reinforced composite material |
| CN109822910A (en) * | 2019-01-30 | 2019-05-31 | 江苏集萃先进高分子材料研究所有限公司 | A kind of composite material connection unit |
| CN109725060A (en) * | 2019-01-31 | 2019-05-07 | 中国民用航空飞行学院 | One kind being based on the cured real time monitoring ultrasound wave system of Joule heat and monitoring method |
| WO2021081888A1 (en) * | 2019-10-31 | 2021-05-06 | 深圳烯湾科技有限公司 | Fiber fabric reinforced composite material and preparation method therefor |
| CN111457211B (en) * | 2020-05-06 | 2021-06-29 | 丹阳丹金航空材料科技有限公司 | High-strength and high-conductivity carbon fiber composite board support and process method thereof |
| CN114211787B (en) * | 2021-12-15 | 2024-01-02 | 北京机科国创轻量化科学研究院有限公司 | Preparation method of carbon fiber laminated plate with multilayer space structure |
| CN114571747B (en) * | 2022-03-02 | 2024-01-16 | 哈尔滨工业大学（威海） | Forming method of pulse current solidified carbon fiber composite material |
| CN114889161A (en) * | 2022-05-18 | 2022-08-12 | 哈尔滨工业大学（威海） | Integrated forming manufacturing method of carbon fiber reinforced resin matrix composite material |
| CN117261291A (en) * | 2023-09-25 | 2023-12-22 | 山东中恒景新碳纤维科技发展有限公司 | Carbon fiber self-heating resin curing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756479A (en) * | 2012-07-27 | 2012-10-31 | 宜兴市飞舟高新科技材料有限公司 | Resin-based carbon fiber damping material and preparation method thereof |
| CN103273662A (en) * | 2013-05-24 | 2013-09-04 | 航天材料及工艺研究所 | Preparation method of low heat expansion carbon fiber reinforced resin matrix composite material mold |
| CN104249462A (en) * | 2013-06-27 | 2014-12-31 | 蓝星（北京）特种纤维技术研发中心有限公司 | Method for preparing carbon fiber reinforced thermoplastic composite material |
| CN104945854A (en) * | 2015-07-23 | 2015-09-30 | 北京化工大学 | Preparation method for short carbon fiber interlayer-reinforced fiber composite material |
-
2015
- 2015-11-23 CN CN201510817586.5A patent/CN105479768B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756479A (en) * | 2012-07-27 | 2012-10-31 | 宜兴市飞舟高新科技材料有限公司 | Resin-based carbon fiber damping material and preparation method thereof |
| CN103273662A (en) * | 2013-05-24 | 2013-09-04 | 航天材料及工艺研究所 | Preparation method of low heat expansion carbon fiber reinforced resin matrix composite material mold |
| CN104249462A (en) * | 2013-06-27 | 2014-12-31 | 蓝星（北京）特种纤维技术研发中心有限公司 | Method for preparing carbon fiber reinforced thermoplastic composite material |
| CN104945854A (en) * | 2015-07-23 | 2015-09-30 | 北京化工大学 | Preparation method for short carbon fiber interlayer-reinforced fiber composite material |
Non-Patent Citations (1)
| Title |
|---|
| 热固性碳纤维编织复合材料C形结构隔膜成型工艺;王永军，杨凯，陈森林，赵国强;《玻璃钢/复合材料》;20150331(第3期);第59-65页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105479768A (en) | 2016-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105479768B (en) | The resistance electrical heating curing certainly of resin-based carbon fiber composite | |
| JP5450584B2 (en) | Material processing apparatus using induction heating and deformable compression means | |
| CN102308667B (en) | Flexible membrane for the production of parts made from composite materials | |
| JP2011514646A5 (en) | ||
| CN106113484A (en) | A kind of thermoplastic composite and the method for attachment of metal | |
| CN106738523B (en) | The resistance heating quick molding method of long fibre and continuous fiber reinforced thermoplastic composite material | |
| CN107202495A (en) | Flash burning structure and flash burning stove | |
| CN109760337A (en) | A kind of electrical heating type thermoplastic composite fiber placement molding machine and method | |
| CN114571747B (en) | Forming method of pulse current solidified carbon fiber composite material | |
| JP2011110719A (en) | Apparatus and method for molding laminated composite material body | |
| TW201819136A (en) | Method and device for consolidating a textile preform and overmoulding | |
| CN205537096U (en) | Vacuum hotpressing aluminium oxide fritting furnace | |
| CN103968664B (en) | Induction sintering furnace for solaode | |
| CN204914389U (en) | Plastic mold press | |
| JPS5468861A (en) | Mold and method for controlling its temperature | |
| CN206310925U (en) | A kind of microwave hot-press agglomerating plant | |
| CN106738493A (en) | A kind of rotor anti-deicing heating component die assembly and pre-heating system | |
| CN1109580A (en) | Electric welding rod inner heating drying method and drying production line | |
| CN206752128U (en) | A kind of high temperature shocks fixing shape machine being heated evenly | |
| CN208846946U (en) | A kind of box roaster | |
| CN207201005U (en) | A kind of apparatus for baking of the outer heat-shrink tube of wire harness magnet ring | |
| CN206011646U (en) | A kind of fiber reinforced plastic mold heater | |
| CN207317541U (en) | Horizontal energy-saving type preheating furnace | |
| CN110116206A (en) | A kind of dedicated AC power frequency discharge sintering equipment of thermoelectric material and sintering method | |
| CN205219333U (en) | Wood -based panel hot press |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |