CN105729828A - Carbon fiber composite material heating and curing process - Google Patents

Carbon fiber composite material heating and curing process Download PDF

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Publication number
CN105729828A
CN105729828A CN201610138728.XA CN201610138728A CN105729828A CN 105729828 A CN105729828 A CN 105729828A CN 201610138728 A CN201610138728 A CN 201610138728A CN 105729828 A CN105729828 A CN 105729828A
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CN
China
Prior art keywords
composite
heating
carbon fibre
curing
temperature
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CN201610138728.XA
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Chinese (zh)
Inventor
梁禹鑫
路强
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安徽佳力奇航天碳纤维有限公司
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Priority to CN201610138728.XA priority Critical patent/CN105729828A/en
Publication of CN105729828A publication Critical patent/CN105729828A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/40Shaping or impregnating by compression not applied
    • B29C70/42Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44Shaping 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/54Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing

Abstract

The invention relates to a carbon fiber composite material heating and curing process, and belongs to the technical field of carbon fiber composite material forming processes. The carbon fiber composite material heating and curing process comprises the following steps: (1) vacuumizing: a carbon fiber composite material is put in a curing device for vacuumizing to reach a vacuum degree of below -0.8 bar and keeping by 2-10 min; (2) pressurization and heating: the environmental temperature in the curing device rises to 120-170 DEG C at a speed of 1.0-2.0 DEGC/min; and meanwhile, the pressure rises to 1.0-2.0 bar; (3) insulation and pressurization: under the pressure condition in the step (2), the pressure continuously rises to 3.0-4.0 bar, and is kept by 100-150 min; and (4) cooling and pressure reduction: the environmental temperature is slowly reduced according to the temperature gradient of 8-12 DEG C; each temperature gradient is kept by 5-15 min; and when the environmental temperature is lower than 80 DEG C, the pressure is slowly reduced. The carbon fiber composite material, obtained by the technical scheme, is higher in product pass percent compared with a traditional process; the production cost is effectively controlled; and the beneficial effects are prominent.

Description

A kind of carbon fibre composite is heating and curing technique

Technical field

The present invention relates to a kind of carbon fibre composite be heating and curing technique, belong to carbon fibre composite molding technology thereof field.

Background technology

Carbon fibre composite is as the composite of a kind of advanced person, there is lightweight, the series of advantages such as modulus is high, specific strength is big, thermal coefficient of expansion is low, high temperature resistant, heat shock resistance, corrosion-resistant, absorbing is good, be widely used in fields such as Aero-Space, automobile, strategic weapons (guided missile etc.).Such as use it on aerospace structure, than conventional metal structure loss of weight 20%~30%, and can obviously improve its aeroelastic characteristic, apply to space industry and can be effectively improved flying quality, cannot or be difficult to reach for other materials.At civil area, the weight of carbon fibre composite is equal to 1/4th of same volume steel, but intensity is equal to ten times of same volume aluminium, thus high-end sports equipment, sports goods such as bicycle, racket, bow and arrow etc., mostly use carbon fiber to make.Carbon fiber product can also be applied to CT bed, artificial limb, orthopedic instrument etc. simultaneously.

Along with the progress of science and technology, the yield of carbon fiber constantly increases, and quality gradually steps up, and production cost declines steadily.The carbon fibre composite of various excellent performances will be increasingly being applied in daily productive life.But owing to carbon fiber manufacturing technique requirent is strict, the country (U.S., Germany, Japan, Korea S) that Carbon Fiber Technology is flourishing the most in the world, for China's output carbon fiber product and technology, remain the most careful attitude.Even if at present, China's carbon fiber and the import of carbon fiber product, also by the strict control of developed country.On the other hand domestic carbon fibre is in quality and in production capacity, the high-quality carbon fibre composite of the market demand, especially civil area can not be met the most far away, be difficult to especially reach world standard, therefore a kind of stable carbon fiber production technology is provided, significant.

In carbon fibre composite production technology, owing to heat exchange and the chemical reaction of complexity can be there is in the technique that is heating and curing of composite, thermograde will be produced in theory in composite inner, particularly when composite volume is bigger, thermograde difference is crossed senior general and is caused composite element internal residual stress excessive, the problem causing the deformation of member.Generally in the technique that is heating and curing, need to assist material in carbon fibre composite outer cladding vacuum bag and airfelt etc., these auxiliary materials are while playing heat insulating function, Temperature Distribution on the surface near mould and the surface near vacuum bag is the most different, in this also results in hot-press arrangement, temperature field is complex, this is also to being heating and curing in technical process, the conduct monitoring at all levels of temperature in hot-press arrangement, it is proposed that requirements at the higher level.

Summary of the invention

For solving problems of the prior art, the invention provides a kind of carbon fibre composite and be heating and curing technique, concrete technical scheme is as follows:

A kind of carbon fibre composite is heating and curing technique, comprises the following steps, step one, evacuation;Step 2, pressurization heats up;Step 3, heat-insulating pressurizing;Step 4, decrease temperature and pressure;

In described step one, carbon fibre composite being put into solidification equipment, be evacuated to less than-0.8bar, hold time 2min~10min;

In described step 2, ambient temperature in solidification equipment rising to 120 DEG C~170 DEG C, programming rate is 1.0 DEG C/min~2.0 DEG C/min, and is pressurized to 1.0bar~2.0bar simultaneously;

In described step 3, under the pressure condition of step 2, continue to be pressurized to 3.0bar~4.0bar, constant voltage 100min~150min;

In described step 4, slowly reducing ambient temperature according to the thermograde of 8 DEG C~12 DEG C, each thermograde insulation 5min~15min, until starting slow blood pressure lowering when ambient temperature is less than 80 DEG C.

As the improvement of technique scheme, in described step 2, when electric thermo-couple temperature reaches 120 DEG C~125 DEG C on composite, ambient temperature is maintained to be consistently greater than electric thermo-couple temperature 2 DEG C~5 DEG C.

As the improvement of technique scheme, when electric thermo-couple temperature rises to 140 DEG C on the composite in step 2, open step 3.

As the improvement of technique scheme, in described step 4, when electric thermo-couple temperature is down to 60 DEG C on composite, complete blood pressure lowering.

The more existing technique of carbon fibre composite conforming product rate that technique scheme obtains is higher, and production cost is effectively controlled, and beneficial effect is notable.

Detailed description of the invention

The invention provides a kind of carbon fibre composite to be heating and curing technique, comprise the following steps, step one, evacuation;Step 2, pressurization heats up;Step 3, heat-insulating pressurizing;Step 4, decrease temperature and pressure;

Step one, evacuation, carbon fibre composite is put into solidification equipment, is evacuated to less than-0.8bar, hold time 2min~10min, the air-tightness in the purpose of evacuation is inspection hot-press arrangement in this step;

Step 2, pressurization heats up, ambient temperature in solidification equipment is risen to 120 DEG C~170 DEG C, programming rate is 1.0 DEG C/min~2.0 DEG C/min, and it is pressurized to 1.0bar~2.0bar simultaneously, the purpose of this step is to be pressed on mould by carbon fibre composite by pressurization, with certain ramp in hot-press arrangement, by the way of convection current, surface and vacuum bagging skin with mould carry out heat exchange, temperature is by the way of conduction of heat, and the following table with vacuum bag upper surface and mould template carries out heat transmission inside composite element respectively;In this step, can control when on composite, electric thermo-couple temperature reaches 120 DEG C~125 DEG C further, ambient temperature is maintained to be consistently greater than electric thermo-couple temperature 2 DEG C~5 DEG C, owing to having started to curing reaction inside carbon fibre composite in this temperature range, curing reaction liberated heat will improve the temperature of composite itself, this temperature can be monitored by the thermocouple being arranged on composite element, now control the temperature of slightly above composite element itself, be conducive to reasonably controlling the uniformity of ambient temperature and component own temperature field, both superpositions are avoided to form the temperature field of complexity, cause component inside solidification gradient different, cause interiors of products stress big, control rational heating rate, it is beneficial to reduce this inhomogeneities;

Step 3, heat-insulating pressurizing, under the pressure condition of step 2, continuing to be pressurized to 3.0bar~4.0bar, constant voltage 100min~150min, the purpose of this step is to maintain certain pressure, guarantee the formed precision of Carbon-fiber Reinforced Plastics Component, in order to improve the uniformity after material molding, when electric thermo-couple temperature rises to 140 DEG C on the composite in step 2, it is then turned on step 3.

Step 4, decrease temperature and pressure, ambient temperature is slowly reduced according to the thermograde of 8 DEG C~12 DEG C, each thermograde insulation 5min~15min, until starting slow blood pressure lowering when ambient temperature is less than 80 DEG C, take first to lower the temperature the technique of blood pressure lowering again, and the technique using point gradient cooling, can be prevented effectively from that rate of temperature fall is too fast will cause the shear stress between component inside residual stress and mould and component, cause component quality problem, when electric thermo-couple temperature is down to 60 DEG C on composite, complete blood pressure lowering.

Below in conjunction with detailed description of the invention, the present invention will be described in detail.

Embodiment one

Follow the steps below carbon fibre composite to be heating and curing technique:

Step one, evacuation, carbon fibre composite is put into solidification equipment, is evacuated to less than-0.8bar, hold time 2min;

Step 2, pressurization heats up, ambient temperature in solidification equipment is risen to 122 DEG C, and programming rate is 1.0 DEG C/min, and is pressurized to 1.2bar simultaneously, when electric thermo-couple temperature reaches 122 DEG C on composite, maintains ambient temperature to be consistently greater than electric thermo-couple temperature 5 DEG C;

Step 3, when on the composite in step 2, electric thermo-couple temperature rises to 140 DEG C, heat-insulating pressurizing, under the pressure condition of step 2, continues to be pressurized to 3.5bar, constant voltage 120min;

Step 4, decrease temperature and pressure, slowly reduces ambient temperature according to the thermogrades of 10 DEG C, each thermograde insulation 10min, until starting slow blood pressure lowering, when electric thermo-couple temperature is down to 60 DEG C on composite when ambient temperature is less than 80 DEG C, complete blood pressure lowering, the carbon fibre composite product obtained.

Embodiment two

Follow the steps below carbon fibre composite to be heating and curing technique:

Step one, evacuation, carbon fibre composite is put into solidification equipment, is evacuated to less than-0.8bar, hold time 5min;

Step 2, pressurization heats up, ambient temperature in solidification equipment is risen to 125 DEG C, and programming rate is 2.0 DEG C/min, and is pressurized to 1.2bar simultaneously, when electric thermo-couple temperature reaches 122 DEG C on composite, maintains ambient temperature to be consistently greater than electric thermo-couple temperature 4 DEG C;

Step 3, when on the composite in step 2, electric thermo-couple temperature rises to 140 DEG C, heat-insulating pressurizing, under the pressure condition of step 2, continues to be pressurized to 3.8bar, constant voltage 100min;

Step 4, decrease temperature and pressure, slowly reduces ambient temperature according to the thermogrades of 12 DEG C, each thermograde insulation 15min, until starting slow blood pressure lowering, when electric thermo-couple temperature is down to 60 DEG C on composite when ambient temperature is less than 80 DEG C, complete blood pressure lowering, the carbon fibre composite product obtained.

Embodiment three

Follow the steps below carbon fibre composite to be heating and curing technique:

Step one, evacuation, carbon fibre composite is put into solidification equipment, is evacuated to less than-0.8bar, hold time 10min;

Step 2, pressurization heats up, ambient temperature in solidification equipment is risen to 127 DEG C, and programming rate is 2.0 DEG C/min, and is pressurized to 2.0bar simultaneously, when electric thermo-couple temperature reaches 125 DEG C on composite, maintains ambient temperature to be consistently greater than electric thermo-couple temperature 2 DEG C;

Step 3, when on the composite in step 2, electric thermo-couple temperature rises to 140 DEG C, heat-insulating pressurizing, under the pressure condition of step 2, continues to be pressurized to 4.0bar, constant voltage 130min;

Step 4, decrease temperature and pressure, slowly reduces ambient temperature according to the thermogrades of 8 DEG C, each thermograde insulation 6min, until starting slow blood pressure lowering, when electric thermo-couple temperature is down to 60 DEG C on composite when ambient temperature is less than 80 DEG C, complete blood pressure lowering, the carbon fibre composite product obtained.

After testing, the more existing technique of carbon fibre composite conforming product rate that above-described embodiment one, two, three obtains is higher, and production cost is effectively controlled, and beneficial effect is notable.

Claims (4)

1. carbon fibre composite is heating and curing a technique, comprises the following steps, step one, evacuation;Step 2, pressurization heats up;Step 3, heat-insulating pressurizing;Step 4, decrease temperature and pressure;It is characterized in that,
In described step one, carbon fibre composite being put into solidification equipment, be evacuated to less than-0.8bar, hold time 2min~10min;
In described step 2, ambient temperature in solidification equipment rising to 120 DEG C~170 DEG C, programming rate is 1.0 DEG C/min~2.0 DEG C/min, and is pressurized to 1.0bar~2.0bar simultaneously;
In described step 3, under the pressure condition of step 2, continue to be pressurized to 3.0bar~4.0bar, constant voltage 100min~150min;
In described step 4, slowly reducing ambient temperature according to the thermograde of 8 DEG C~12 DEG C, each thermograde insulation 5min~15min, until starting slow blood pressure lowering when ambient temperature is less than 80 DEG C.
2. carbon fibre composite as claimed in claim 1 a kind of is heating and curing technique, it is characterised in that in described step 2, when electric thermo-couple temperature reaches 120 DEG C~125 DEG C on composite, maintain ambient temperature to be consistently greater than electric thermo-couple temperature 2 DEG C~5 DEG C.
3. carbon fibre composite as claimed in claim 2 a kind of is heating and curing technique, it is characterised in that when electric thermo-couple temperature rises to 140 DEG C on the composite in step 2, open step 3.
4. carbon fibre composite as claimed in claim 1 a kind of is heating and curing technique, it is characterised in that in described step 4, when electric thermo-couple temperature is down to 60 DEG C on composite, complete blood pressure lowering.
CN201610138728.XA 2016-03-12 2016-03-12 Carbon fiber composite material heating and curing process CN105729828A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106916392A (en) * 2017-03-24 2017-07-04 合肥悦兰信息技术有限公司 Laminated bow material for producing the light-duty bow and arrow of high resiliency

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070108665A1 (en) * 2005-11-14 2007-05-17 Glain Michael L Bulk resin infusion system apparatus and method
CN101394979A (en) * 2006-03-08 2009-03-25 东丽株式会社 Production method of fiber-reinforced resin
CN102529121A (en) * 2010-11-26 2012-07-04 株式会社芦田制作所 Autoclave molding method and autoclave molding apparatus
CN103921450A (en) * 2014-04-28 2014-07-16 西北工业大学 Manufacturing method of wing-body integrated honeycomb sandwiched composite material skin
CN104736324A (en) * 2012-10-24 2015-06-24 三菱丽阳株式会社 Method for molding fiber-reinforced plastic

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070108665A1 (en) * 2005-11-14 2007-05-17 Glain Michael L Bulk resin infusion system apparatus and method
CN101394979A (en) * 2006-03-08 2009-03-25 东丽株式会社 Production method of fiber-reinforced resin
CN102529121A (en) * 2010-11-26 2012-07-04 株式会社芦田制作所 Autoclave molding method and autoclave molding apparatus
CN104736324A (en) * 2012-10-24 2015-06-24 三菱丽阳株式会社 Method for molding fiber-reinforced plastic
CN103921450A (en) * 2014-04-28 2014-07-16 西北工业大学 Manufacturing method of wing-body integrated honeycomb sandwiched composite material skin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106916392A (en) * 2017-03-24 2017-07-04 合肥悦兰信息技术有限公司 Laminated bow material for producing the light-duty bow and arrow of high resiliency

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Application publication date: 20160706