CN108839359A - Composite element curing process and composite product - Google Patents
Composite element curing process and composite product Download PDFInfo
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- CN108839359A CN108839359A CN201810639024.XA CN201810639024A CN108839359A CN 108839359 A CN108839359 A CN 108839359A CN 201810639024 A CN201810639024 A CN 201810639024A CN 108839359 A CN108839359 A CN 108839359A
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- composite
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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
- B29C70/30—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
-
- 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
Abstract
The invention belongs to Material Field, it is related to a kind of composite element curing process and composite product, the curing process includes the following steps：1) composite product to be processed heated in vibration experiment platform and isothermal holding；2) it during heating and heat preservation, is vibrated by vibration experiment platform to composite product to be processed；3) after vibrating, low pressure is applied to composite product to be processed by vibration experiment platform；4) during applying low pressure, secondary temperature elevation is carried out to composite product to be processed and completes the subsequent cure of composite product to be processed.The present invention provides a kind of porosity that can obviously reduce composite product under low solidifying pressure, improves composite product performance, can be achieved that large-scale composite material product is safe and efficient and the composite product curing process of energy saving ground forming and hardening.
Description
Technical field
The invention belongs to Material Field, it is related to a kind of composite element curing process and composite product, especially relates to
And it a kind of composite element curing process under vibration pretreatment and environment under low pressure and is prepared based on the curing process
Composite product.
Background technique
Composite product is widely used in the high frontier such as aerospace, but the presence of hole because of its plurality of advantages
The safety and reliability that composite product uses in practical projects will be seriously affected.Therefore, it is required in air standard
Porosity inside composite product is lower than 1%, requires porosity lower than 5% in other industry.Currently, reducing composite material
The mode of product porosity mainly utilizes autoclave high-pressure process, and the composite material system of low porosity is completed in hyperbaric environment
Part molding.However, the technique, which still exists, manufactures this height, using dangerous, energy consumption height and solidifying pressure and its uniformity requirement
The engineering problems such as molding manufacture difficulty caused by high is big.
Summary of the invention
In order to solve the above technical problems in background technology, the present invention provides one kind can under low solidifying pressure
Be substantially reduced composite product porosity, improve composite product performance, can be achieved large-scale composite material product safety,
Efficient and energy conservation ground forming and hardening composite product curing process.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of composite element curing process, it is characterised in that：The composite element curing process includes following
Step：
1) composite product to be processed heated in vibration experiment platform and isothermal holding；
2) during heating and heat preservation, vibration is provided to composite product to be processed by vibration experiment platform
It is dynamic；
3) after vibrating, low pressure is applied to composite product to be processed by vibration experiment platform；
4) during applying low pressure, secondary temperature elevation is carried out to composite product to be processed and is completed to be processed
The subsequent cure of composite product.
Preferably, the specific implementation of heating and isothermal holding in step 1) of the present invention is：It will be to
The composite product of processing is heated to 80 DEG C in vibration experiment platform from 30 DEG C, keeps the temperature 30min.
Preferably, in step 1) of the present invention by composite product to be processed in vibration experiment platform
80 DEG C are heated to from 30 DEG C with the heating rate of 1.5 DEG C/min.
Preferably, the vibration in step 2) of the present invention is 5g-20g, g=9.8m/s.
Preferably, the low pressure in step 3) of the present invention is 0MPa-0.2MPa.
Preferably, the secondary temperature elevation in step 4) of the present invention be to composite product to be processed from
80 ° are heated to 180 °, keep the temperature 120min.
Preferably, the secondary temperature elevation in step 4) of the present invention be to composite product to be processed with
The heating rate of 1.5 DEG C/min is heated to 180 ° from 80 °.
Preferably, heating of the present invention, heat preservation and secondary temperature elevation are all made of nichrome strip heater
It is heated or is kept the temperature.
Preferably, the vibration frequency section 10HZ-2000HZ of vibration experiment platform of the present invention；The vibration
- 70 DEG C -200 DEG C of the temperature range of experiment porch；The vibration acceleration of the vibration experiment platform is not more than 50g, g=9.8m/
s。
A kind of composite product being prepared based on composite element curing process as described above.
It is an advantage of the invention that：
The present invention provides a kind of composite element curing process and composite product, this method includes 1) will be to be added
The composite product of work heats in vibration experiment platform and isothermal holding；2) during heating and heat preservation, pass through vibration
Dynamic experiment porch is vibrated to composite product to be processed；3) after vibrating, by vibration experiment platform to be processed
Composite product applies low pressure；4) during applying low pressure, secondary temperature elevation is carried out to composite product to be processed
And complete the subsequent cure of composite product to be processed.The present invention for high-performance large-scale answer material product to solidifying pressure and
The big problem of molding manufacture difficulty caused by its uniformity requirement is high, proposing composite product, " vibration pretreatment+low pressure is solid
The forming process of change ".For in terms of the porosity, composite product is handled by the random vibration of 5g, 10g, 15g, 20g
And after the solidification of 0PMa pressure range, porosity is respectively：0.67%, 0.48%, 0.85%, 1.51%.By random vibration
The composite product of processing is after 0PMa pressure-cure, internal porosity 1%.When random vibration acceleration is 10g,
Relative to the 0MPa product of processing without friction, lamination is eliminated inside product, porosity drops to 0.48% from 5.17%.When
Porosity is respectively when the external pressure of subsequent technique reaches 0.1MPa：0.62%, 0.26%, 0.73%, 0.88%.Through over vibration
Dynamic processing and after the solidification of 0.1PMa pressure range, product interior porosity is integrally less than 1%, and wherein random vibration acceleration is
Porosity when 10g inside product reaches minimum 0.26%, can reach the effect of autoclave 0.6MPa solidified forming product.When
Porosity is respectively when the external pressure of subsequent technique reaches 0.2MPa：0.6%, 0.28%, 0.66%, 0.67%, relative to
The 0.2MPa product of processing without friction, product interior porosity can drop to 0.25% from 2.2%, decrease by 87.2%.From
Interlaminar shear strengths comparative analysis, 0.6MPa pretreated product without friction are averaged interlaminar shear strength as 79.9MPa.5g,
The product that tetra- vibration accelerations of 10g, 15g, 20g shape at 0.2 mpa, the variation tendency of interlaminar shear strength are：
77.1MPa,81.69MPa,76.91MPa,76.7MPa；It is only 4% relative to the 0.6MPa maximum range of decrease.Add by four vibrations
The product that speed is pre-processed and shaped at 0.1MPa, the variation tendency of interlaminar shear strength are：78.37MPa,82.43MPa,
75.71MPa, 71.91MPa are 8.7% relative to the 0.6MPa maximum range of decrease.By the pretreatment of four vibration accelerations and
The variation tendency of the product shaped under 0.0MPa, interlaminar shear strength is：71.13MPa,73.12MPa,68.57MPa,
60.91MPa, by the Interlaminar shear strengths of vibration pretreatment 0MPa product relative to pretreated 0MPa product interlayer without friction
The average amplification of cutting performance is up to 41.6%.By vibrating the composite product of preprocessing low-pressure power section forming, at
Porosity after shape decreased significantly relative to the porosity of low pressure pretreated product without friction；Also, the interlayer of product is cut
Performance is cut to significantly improve.The present invention uses T800/X850 aviation composite, and the principle based on standard aviation laying uses
Multidirectional laying obtains porosity in the low pressure zone 0MPa, 0.1MPa and 0.2MPa using random vibration pretreatment and is lower than
0.3%, interlaminar shear strength is higher than the composite product of 80MPa.The present invention is mentioned relative to traditional autoclave high-pressure process
Go out a kind of to obtain the vibration pretreatment of composite material under low-pressure using random vibration pre-conditioning stage and combine low pressure curing type
Novel forming technology can obviously reduce the porosity of composite product, improve composite product performance, large size can be achieved again
Condensation material product is safe and efficient and energy saving ground forming and hardening.
Detailed description of the invention
Fig. 1 is porosity figure of the composite product in vibration processing combination low pressure curing type product；
Fig. 2 is that composite product in autoclave process solidifies the porosity of product to figure；
Fig. 3 is the interlaminar shear strength comparison diagram of composite product different vibration processings under the pressure of 0.2MPa；
Fig. 4 is the interlaminar shear strength comparison diagram of composite product different vibration processings under the pressure of 0.1MPa.
Specific embodiment
The present invention provides a kind of composite element curing process, which includes following step
Suddenly：
1) composite product to be processed heated in vibration experiment platform and isothermal holding, wherein heating and protect
Temperature processing is to heat composite product to be processed from 30 DEG C with the heating rate of 1.5 DEG C/min in vibration experiment platform
To 80 DEG C, 30min is kept the temperature；Heating and heat preservation are heated or are kept the temperature using nichrome strip heater；Vibration experiment is flat
The vibration frequency section 10HZ-2000HZ of platform；- 70 DEG C -200 DEG C of the temperature range of vibration experiment platform；Vibration experiment platform
Vibration acceleration is not more than 50g, g=9.8m/s.
2) during heating and heat preservation, vibration is provided to composite product to be processed by vibration experiment platform
It is dynamic；Vibration is 5g-20g, g=9.8m/s；
3) after vibrating, low pressure is applied to composite product to be processed by vibration experiment platform, low pressure is
0MPa-0.2MPa；
4) during applying low pressure, secondary temperature elevation is carried out to composite product to be processed and is completed to be processed
The subsequent cure of composite product, secondary temperature elevation are to composite product to be processed with the heating rate of 1.5 DEG C/min
It is heated to 180 ° from 80 °, keeps the temperature 120min；Secondary temperature elevation is heated or is kept the temperature using nichrome strip heater.
Meanwhile the present invention also provides a kind of based on being prepared into according to composite element curing process noted before
The composite product arrived.
Specifically, vibration experiment platform of the present invention is designed by the Chinese National University of Defense technology, vibration frequency
Section [10,2000] HZ, temperature range [- 70 DEG C, 200 DEG C], maximum vibration acceleration 50g.Shaking platform utilizes external pneumatics
Machine provides stable vibration source as power source, sustainable utilization pneumatic hammer for mounting platform, and vibration is from mounting platform under in vibration processes
Composite wood material is transferred on and.
The screenshot technological parameter of composite element curing process provided by the present invention is：Product is flat in vibration in experiment
It is heated to 80 DEG C (heating rate is 1.5 DEG C/min, using nichrome strip heater) from 30 DEG C in platform, and keeps the temperature
30min provides grouping to 5g, 10g, 15g, 20g (g=9.8m/s) vibration acceleration in heating and holding stage shaking platform.
After heat preservation (this process does not cool down), difference organizes other vibration product will be in two pressure of vibrationless 0.1MPa, 0.2MPa
Section is heated to 180 ° of heat preservation 120min (heating rate is 1.5 DEG C/min, using nichrome strip heater) from 80 °,
Complete subsequent curing reaction.
Referring to Fig. 1 and Fig. 2, composite product is in vibration pretreatment and autoclave hot-press solidifying product interior porosity
Comparative analysis, wherein：Composite product is by the random vibration processing of 5g, 10g, 15g, 20g and solid in 0PMa pressure range
After change, porosity is respectively：0.67%, 0.48%, 0.85%, 1.51%.The composite product handled by random vibration
After 0PMa pressure-cure, internal porosity 1%.When random vibration acceleration is 10g, relative to processing without friction
0MPa product eliminates lamination inside product, and porosity drops to 0.48% from 5.17%.When the external pressure of subsequent technique
Porosity is respectively when reaching 0.1MPa：0.62%, 0.26%, 0.73%, 0.88%.It is pressed by vibration processing and in 0.1PMa
After the solidification of power section, hole of the product interior porosity integrally less than 1%, when wherein random vibration acceleration is 10g inside product
Gap rate reaches minimum 0.26%, can reach the effect of autoclave 0.6MPa solidified forming product.When the external pressure of subsequent technique
Porosity is respectively when power reaches 0.2MPa：0.6%, 0.28%, 0.66%, 0.67%, relative to processing without friction
0.2MPa product, product interior porosity can drop to 0.25% from 2.2%, decrease by 87.2%.
Referring to Fig. 3 and Fig. 4, from Interlaminar shear strengths comparative analysis, 0.6MPa pretreated product average layer without friction
Between shear strength be 79.9MPa.The product that tetra- vibration accelerations of 5g, 10g, 15g, 20g shape at 0.2 mpa, interlayer shear
The variation tendency of intensity is：77.1MPa,81.69MPa,76.91MPa,76.7MPa；It is only relative to the 0.6MPa maximum range of decrease
4%.The product for pre-processing by four vibration accelerations and shaping at 0.1MPa, the variation tendency of interlaminar shear strength are：
78.37MPa, 82.43MPa, 75.71MPa, 71.91MPa are 8.7% relative to the 0.6MPa maximum range of decrease.Add by four vibrations
The product that speed is pre-processed and shaped at 0.0MPa, the variation tendency of interlaminar shear strength are：71.13MPa,73.12MPa,
68.57MPa, 60.91MPa, by the Interlaminar shear strengths of vibration pretreatment 0MPa product relative to without friction pretreated
The average amplification of 0MPa product Interlaminar shear strengths is up to 41.6%.By the composite wood of vibration preprocessing low-pressure power section forming
Expect product, the porosity after forming decreased significantly relative to the porosity of low pressure pretreated product without friction；Also, it makes
The Interlaminar shear strengths of part significantly improve.
It is big that material product caused molding manufacture difficulty high to solidifying pressure and its uniformity requirement is answered for high-performance large-scale
The problem of, propose the forming process of composite product " vibration pretreatment+low pressure curing type ".Use T800/X850 aviation
Composite material, the principle based on standard aviation laying use multidirectional laying, using random vibration pretreatment in 0MPa, 0.1MPa and
The composite product that porosity is higher than 80MPa lower than 0.3%, interlaminar shear strength is obtained in the low pressure zone 0.2MPa.
Claims (10)
1. a kind of composite element curing process, it is characterised in that：The composite element curing process includes following step
Suddenly：
1) composite product to be processed heated in vibration experiment platform and isothermal holding；
2) during heating and heat preservation, vibration is provided to composite product to be processed by vibration experiment platform；
3) after vibrating, low pressure is applied to composite product to be processed by vibration experiment platform；
4) during applying low pressure, secondary temperature elevation is carried out to composite product to be processed and is completed to be processed compound
The subsequent cure of material.
2. composite element curing process according to claim 1, it is characterised in that：Heating in the step 1) and
The specific implementation of isothermal holding is：Composite product to be processed is heated to 80 from 30 DEG C in vibration experiment platform
DEG C, keep the temperature 30min.
3. composite element curing process according to claim 2, it is characterised in that：It will be to be processed in the step 1)
Composite product be heated to 80 DEG C from 30 DEG C with the heating rate of 1.5 DEG C/min in vibration experiment platform.
4. composite element curing process according to claim 3, it is characterised in that：Vibration in the step 2) is
5g-20g, g=9.8m/s.
5. composite element curing process according to claim 4, it is characterised in that：Low pressure in the step 3) is
0MPa-0.2MPa。
6. composite element curing process according to claim 5, it is characterised in that：Secondary liter in the step 4)
Temperature is to be heated to 180 ° from 80 ° to composite product to be processed, keeps the temperature 120min.
7. composite element curing process according to claim 6, it is characterised in that：Secondary liter in the step 4)
Temperature is to be heated to 180 ° from 80 ° with the heating rate of 1.5 DEG C/min to composite product to be processed.
8. composite element curing process described in -7 any claims according to claim 1, it is characterised in that：It is described to add
Heat, heat preservation and secondary temperature elevation are all made of nichrome strip heater and are heated or kept the temperature.
9. composite element curing process according to claim 8, it is characterised in that：The vibration of the vibration experiment platform
Dynamic frequency section 10HZ-2000HZ；- 70 DEG C -200 DEG C of the temperature range of the vibration experiment platform；The vibration experiment platform
Vibration acceleration be not more than 50g, g=9.8m/s.
10. a kind of composite product being prepared based on composite element curing process as claimed in claim 9.
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| CN109353033A (en) * | 2018-12-11 | 2019-02-19 | 中南大学 | A kind of composite formed manufacturing device of the microwave cavity containing cooling-part |
| CN109367062A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite formed manufacturing device of microwave homogeneous radiation |
| CN109367060A (en) * | 2018-12-10 | 2019-02-22 | 中南大学 | A kind of microwave heating curing method of pair of composite material |
| CN109367064A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite material solidification equipment of the prismatic microwave cavity containing equilateral polygon section |
| CN109367066A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite formed manufacturing device uniformly receiving microwave radiation |
| CN109367058A (en) * | 2018-12-07 | 2019-02-22 | 中南大学 | A kind of automatic control microwave heating solidification equipment of carbon fibre composite |
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| CN109367061A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite formed manufacturing device |
| CN109367066A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite formed manufacturing device uniformly receiving microwave radiation |
| CN109367064A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite material solidification equipment of the prismatic microwave cavity containing equilateral polygon section |
| CN109367062A (en) * | 2018-12-11 | 2019-02-22 | 中南大学 | A kind of composite formed manufacturing device of microwave homogeneous radiation |
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