CN103737946B - A kind of forming method of two-ply foam sandwich structure polymer matrix composites - Google Patents
A kind of forming method of two-ply foam sandwich structure polymer matrix composites Download PDFInfo
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- CN103737946B CN103737946B CN201410002892.9A CN201410002892A CN103737946B CN 103737946 B CN103737946 B CN 103737946B CN 201410002892 A CN201410002892 A CN 201410002892A CN 103737946 B CN103737946 B CN 103737946B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
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Abstract
The invention discloses a kind of forming method of two-ply foam sandwich structure polymer matrix composites, liquid molding method is adopted to realize the global formation preparation of two-ply foam sandwich structure polymer matrix composites, comprise the following steps: can on heating work mould, adopt impregnation technology step by step, utilize the lower floor's preform in Resin Film Infusion method Z-direction dipping double-layer sandwich structure preform, then adopt the upper strata preform in vacuum importing method of molding importing liquid resin infusion double-layer sandwich structure preform and middle level preform; After having flooded, it is shaping the two layers of foam sandwich that upper, middle and lower layer preform and the centre of impregnated with resin are mingled with to be carried out co-curing, obtains two-ply foam sandwich structure polymer matrix composites.The present invention has low, the functional advantage such as by force of simple to operate, environmental protection, cost, is particularly suitable for the shaping preparation of large-sized composite material component.
Description
Technical field
The invention belongs to the processing technique field that dimension strengthens polymer matrix composites, particularly relate to a kind of forming method with the polymer matrix composites of sandwich structure.
Background technology
Sandwich structure is since 20th century, the forties occurred, its main feature is that bending rigidity is large, lightweight construction, namely sandwich structure has high specific strength and specific modulus, and endurance, shock resistance are good, sound insulation, the excellent performance such as heat insulation, and can apparatus with shock absorbing effectively, simultaneously also by selecting suitable panel, core and adhesive, meet the requirement under various service condition, be therefore important in aerospace engineering " structural material " always.
The shaping general employing of sandwich structure be carry out bonding solidification again by after panel, core respectively preformed, the more and bad guarantee of bonding quality of operation.For single layer foam sandwich structure composite material, except some specialities can adopt the method for middle foaming bonding both sides panel continuously shaped except, various types of structure all can also adopt the vacuum of low cost to import molding (VIMP) technological forming, and (Vacuum infusion molding process is coated with flexible vacuum bag film in one side rigid die, sealing fibre reinforced materials, utilize the gas in negative pressure of vacuum eliminating die cavity, and drive resin flows by negative pressure of vacuum and realize resin to fiber and textile impregnation thereof, and under room temperature or heating condition direct curing molding): the fabric that lower floor's lay is dry, middle level lay fluting open celled foam core, the fabric that upper strata lay is dry, then vacuum bag film encapsulation is adopted, resin-dipping, solidification, one-shot forming, in this technique, the designability of panel laying is strong, panel is bonding with core well, product properties is excellent, the strong engineer applied (see table 1) having promoted single layer foam sandwich structure.
Table 1: several typical apply of individual layer sandwich structure
Along with individual layer sandwich structure is more and more extensive in engineer applied, people have also found the some shortcomings that it exists gradually, such as: opposing low velocity impact poor performance.When its manufacturing shaping, transport, in operation and maintenance process by the low velocity impact of exotic (as instrument drop, hail impact etc.), counter plate is caused MATRIX CRACKING and fibrous fracture, the damage of the various ways such as interfacial detachment between panel and core body, thus cause the reduction of structural-load-carrying capacity, especially appearance significantly declines by compression or shearing bearing capacity, even loses efficacy.The subsequent burst that damage causes structure is also very serious, such as, after outer panels is destroyed, has water or other materials to infiltrate core and also can cause structural failure.In addition individual layer sandwich structure also can be applicable to military equipment, as helicopter wing, but once structure is destroyed, then cannot continue to use, and need to repair immediately.
In order to solve the problem, there has been proposed double-layer sandwich structure.Double-layer sandwich structure as shown in Figure 1, forms primarily of top panel 1, lower panel 2, upper foam sandwich 3, lower floor's foam core 4 and wainscot 5.Double-layer sandwich structure not only has the general characteristic of individual layer sandwich structure, also has special advantage, is mainly reflected in following three aspects:
(1) double-layer sandwich structure introduces wainscot 5, improves its hardness in crash direction, and effect of impact can also be disperseed to whole sandwich structure by wainscot 5 simultaneously, and therefore double-layer sandwich structure has better anti-collision performance.Result of study both domestic and external shows: under higher impact velocity, and the degree of injury of multilayer sandwich structure is less than individual layer sandwich structure; After impact, multilayer sandwich structure has higher remnant compressive strengths than individual layer sandwich structure.
(2) there is transition state in the damage type of double-layer sandwich structure, is not that outer panels will lose efficacy once damage total.Therefore, in emergency circumstances do not need to repair immediately at some, still can continue to use.
(3) because core upper and lower in double-layer sandwich structure can be the same or different, so can design according to various demand, reach the object of Appropriate application material, thus greatly extend the scope of application of sandwich structure.
With regard to manufacture craft, single layer foam sandwich structure can adopt the Vacuum infusion molding process of low cost shaping, in actual forming process, slotted by core perforate (leading glue hole), the upper and lower preform in individual layer sandwich structure can be soaked into based on traditional VIMP technique of flooding in face, and then integral solidifying goods; But for two-ply foam sandwich structure, due to the isolation of two-ply foam core, this class formation can not adopt traditional VIMP technique to realize the preparation of low cost entirety, the same with individual layer sandwich structure, perforate in foam core material (leading glue hole) is slotted, upper strata in double-layer sandwich structure and middle level preform can be soaked into based on traditional VIMP technique of flooding in face, but lower floor's preform can not be soaked into completely, cannot the qualified double-layer sandwich composite structure of preparation quality.Particularly after resin system adds solid fireproof filler, resin flows performance declines, and is more difficult to soak into lower floor's preform, can not the good large scale double-layer sandwich composite structure of global formation anti-collision performance.
Visible, though double-layer sandwich structural behaviour is good, its manufacturing process is remarkable, need bonding, curing molding after three deck panels, two-layer sandwich respectively preformed, operation is many, process costs is high, and bonding quality is difficult to ensure, these shortcomings limit applying of double-layer sandwich structure.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, provides a kind of simple to operate, environmental protection, cost low, functional strong, the forming method that is particularly suitable for the two-ply foam sandwich structure polymer matrix composites of large-sized composite material component.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of forming method of two-ply foam sandwich structure polymer matrix composites, it is characterized in that, liquid molding method is adopted to realize the global formation preparation of two-ply foam sandwich structure polymer matrix composites, comprise the following steps: can on heating work mould, adopt impregnation technology step by step, utilize lower floor's (bottom) preform in Resin Film Infusion method (RFI) Z-direction dipping double-layer sandwich structure preform, adopt vacuum to import method of molding (VIMP) again and import upper strata preform in liquid resin infusion double-layer sandwich structure preform and middle level preform, after having flooded, it is shaping the two layers of foam sandwich that upper, middle and lower layer preform and the centre of impregnated with resin are mingled with to be carried out co-curing, obtains two-ply foam sandwich structure polymer matrix composites.
In above-mentioned forming method, preferably, described double-layer sandwich structure preform is seated in a resin molding (resin molding preferably has functional form resin molding that is fire-retardant or anti-ultraviolet ageing function) surface, and described double-layer sandwich structure preform comprises lower floor's reinforcing material, lower floor's foam core, middle level reinforcing material, upper foam sandwich and upper strata reinforcing material from the bottom to top successively.
In above-mentioned forming method, preferably, the described vacuum vacuum leading device imported in method of molding is arranged on the top of described double-layer sandwich structure preform, and utilizes vacuum bag film described double-layer sandwich structure preform and resin molding to be encapsulated in the lump in vacuum importing method of molding.
In above-mentioned forming method, preferably, before utilizing Resin Film Infusion method Z-direction to flood double-layer sandwich structure preform, first by vacuumize make work mould keep vacuum state (preferred relative vacuum degree is not less than 0.95 atmospheric pressure/atm, namely absolute vacuum is not more than 0.05 atmospheric pressure), then after making Resin Film Infusion by heating work mould, Z-direction floods double-layer sandwich structure preform (preferred temperature control 60 DEG C ~ 70 DEG C).
In above-mentioned forming method, preferably, before adopting vacuum to import method of molding importing liquid resin infusion double-layer sandwich structure preform, the heating system of described work mould is closed.
In above-mentioned forming method, preferably, carry out described co-curing by heating work mould again shaping, temperature when co-curing is shaping controls at 60 DEG C ~ 70 DEG C, and vacuum degree control is not less than 0.95 atmospheric pressure/atm in relative vacuum.
Compared with prior art, the invention has the advantages that:
(1) the present invention adopts timesharing impregnation technology in Z-direction/face to prepare double-layer sandwich composite structure, belongs to liquid phase global formation, its processing step and VIMP technique similar, not only easy and simple to handle, and preparation cost is low;
(2) in Resin Film Infusion method of the present invention can lay all in functional form resin moldings such as fire-retardant, anti-ultraviolet ageings, thus make the lower surface of double-layer sandwich composite have the function such as fire-retardant, anti-ultraviolet ageing accordingly, enable double-layer sandwich composite structure meet varying environment instructions for use;
(3) the present invention's entirety adopts vacuum bag molded, the fiber volume fraction of each deck panels is higher, in addition double-layer sandwich structural rate individual layer sandwich structure has higher shock resistance, and the composite element that thus prepared by technique can be used for the main force support structures such as spacecraft, track traffic, boats and ships;
(4) appearance and size, the form and position tolerance of the double-layer sandwich composite structure adopting the present invention's entirety to prepare ensure by rigidity former, easily meet design requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing double-layer sandwich structure.
Fig. 2 is the impregnation technology schematic diagram of forming method of the present invention.
Fig. 3 is the photo of the shaping bilayer that obtains and individual layer core filled composite material slab construction sample in the embodiment of the present invention 1; Be followed successively by upper and lower foam core aspect ratio from left to right at 5:15,10:10,15:5 two-ply foam core filled composite material sample and single layer foam core filled composite material.
Marginal data:
1, top panel (after shaping); 2, lower panel (after shaping); 3, upper foam sandwich; 4, lower floor's foam core; 5, wainscot (after shaping); 6, glue hole is led; 7, middle level preform (before shaping); 8, resin molding; 9, upper strata preform (before shaping); 10, permeable medium; 111, gluing nozzle; 112, injected rubber hose; 121, overflow Jiao Zui; 122, overflow sebific duct; 13, vacuum bag film; 14, lower floor's preform (before shaping); 15, sealing joint strip.
Detailed description of the invention
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection domain not thereby limiting the invention.
embodiment 1: prepare two-ply foam sandwich structure polymer matrix composites dull and stereotyped.
A forming method for two-ply foam sandwich structure polymer matrix composites of the present invention as shown in Figure 2, specifically comprises the following steps:
1. mould prepares:
On metal plate mould (the embedded Resistant heating system) working face of 500mm*500mm, after carrying out polishing, clear up, processing, coating releasing agent, for subsequent use.
2. material prepares:
Requirement is prepared according to product, get out corresponding reinforcing material, RFI resin molding, liquid impregnating resin respectively, and flow-guiding screen, release cloth, suction collodion, vacuum bag film 13, sealing joint strip 15, vacuum slot needed for Vacuum infusion molding process, walk the auxiliary material such as sebific duct, injected rubber hose, collection glue tank.
2.1RFI resin molding prepares:
By 500g epoxy resin E-44 (a kind of light yellow viscous liquid, purchased from Epoxy Resin of Yueyang Petro-Chemical Industry General Plant) and 500g epoxy resin CYD-011(white clear solid, purchased from Epoxy Resin of Yueyang Petro-Chemical Industry General Plant) after mixture is good, add 40g704 curing agent (a kind of brownish black liquid, main component is glyoxal ethyline and expoxy propane iso-octyl ether addition product, purchased from Tianjin chemical reagent Co., Ltd), stir, flat plate mold spreads to the resin molding that thickness is about 0.5mm.After room temperature is dried, cutting with a paper cutter, it is for subsequent use to cut 400mm*400mm resin molding.
2.2 reinforcing materials prepare:
Alkali-free glass fibre 04 plain (purchased from Jiangsu Danyang Zhongya Glass Fiber Co., Ltd.) is cut into 400mm*400mm square and amounts to 18 pieces, in 105 DEG C of baking ovens, dry 10h, for subsequent use.
2.3PVC foam core material prepares:
By commercial 40kg/m
3pVC foam profile plate (purchased from Tianjin Sa Weisi chemical industry composite Co., Ltd) cut into the 400mm*400mm square that 2 pieces of thickness are 10mm, for subsequent use.
3. resin molding lay:
At the resin molding 8 that ready die surface lay 0.5mm is thick, the lay amount of resin molding 8 is that the amount of resin needed for lower floor's composite material face of two-ply foam core filled composite material target product carries out controlling (see Fig. 2).
4. fibre bed lay:
On resin molding 8 surface of lay, the lower floor's reinforcing material (6 layer of 04 plain) successively needed for lay two-ply foam core filled composite material target product, lower floor foam core 4(1 layer PVC foam), middle level reinforcing material (6 layer of 04 plain), upper foam sandwich 3(1 layer PVC foam) and upper strata reinforcing material (6 layer of 04 plain).
5. vacuum bag film encapsulation:
According to VIMP technological requirement, in the good fibre bed of lay (comprising the RFI resin molding of lay successively, lower floor's reinforcing material, lower floor's foam core, middle level reinforcing material, upper foam sandwich and upper strata reinforcing material), lay release cloth and permeable medium 10 successively, after arranging that gluing nozzle 111 and excessive glue chew 121, be about 70mm ~ 100mm external pasting sealing joint strip 15 at die edge apart from fibre bed, and by vacuum bag film 13, all former, auxiliary material be sealed in vacuum bag.
6. vacuum line connects:
Connection glue injection pipe 112 on gluing nozzle 111, chews on 121 at excessive glue and connects the sebific duct 122 that overflows, and after the sebific duct 122 that overflows connecting collection glue tank, then is connected with vavuum pump, checks vacuum.After blocking injected rubber hose, start vavuum pump, check the sealing of whole die cavity (vacuum bag film packaging area).After die cavity sealing is qualified, next operating procedure can be started.
7. resin molding melting infiltration:
Start and maintain mold cavity vacuum state, starting mold heating device, make mould be warming up to 60 DEG C, after resin molding melting, under the vacuum pressures, making to be laid in the resin molding dipping lower floor preform 14(of die surface and lower floor's plain fabric of fibre bed).
8. liquid resin vacuum imports:
By epoxy resin LT-5078A(purchased from exhibitions electronic material (Shanghai) Co., Ltd.) and corresponding curing agent LT-5078-2 in 100:30 ratio mixing after, injected rubber hose 11 is inserted in glue bucket, open injecting glue valve, glue is made to import in sealing die cavity under vacuum pressure effect, by walking sebific duct, lead the upper strata preform 9 rapidly in shunting, impregnated fiber bed such as glue hole 6, permeable medium 10 and middle level preform 7 after, close injecting glue valve.
9. integrally curing:
Maintain system vacuum, and mold system (composite together with also uncured) is sent into baking oven, baking oven is warming up to 70 DEG C, and insulation 4h, makes the two-ply foam core filled composite material preform integrally curing be sealed in vacuum bag film.After fibre bed solidification, closing molding heating system, makes mould and products temperature be reduced to room temperature.
10. the demoulding and post processing:
Remove vacuum bag film and release cloth, permeable medium, gluing nozzle, walk the auxiliary material such as sebific duct and excessive Jiao Zui, knock gently, two-ply foam core filled composite material flat board is removed from metal plate, removes overlap, obtain two-ply foam sandwich structure polymer matrix composites dull and stereotyped.
Adopt same technique, prepared upper and lower foam core height respectively and be respectively: two-ply foam core filled composite material sample and the single layer foam core filled composite material plane plate specimen of 5:15,10:10,15:5 are shown in Fig. 3.
embodiment 2: prepare double-layer sandwich structural composite material subway head-shield.
1. mould prepares:
In the composite headstock hood die face of built-in resistor silk heating system, after carrying out polishing cleaning process, coating releasing agent, for subsequent use.
2.RFI resin molding prepares:
By 5000g epoxy resin E-44 (a kind of light yellow viscous liquid, purchased from Epoxy Resin of Yueyang Petro-Chemical Industry General Plant) and 5000g epoxy resin CYD-011(white clear solid, purchased from Epoxy Resin of Yueyang Petro-Chemical Industry General Plant) after mixture is good, add the ultra-fine Al of 8000g (OH) respectively
3(white powder, Zhuzhou electric locomotive Guang Yuan scientific & technical corporation provides) and 1500g dimethyl methyl phosphonate (DMMP, water white transparency low-viscosity (mobile) liquid, purchased from Qingdao Lian Mei Chemical Co., Ltd.), 400g704 curing agent (a kind of brownish black liquid, main component is glyoxal ethyline and expoxy propane iso-octyl ether addition product, purchased from Tianjin chemical reagent Co., Ltd), stir, flat plate mold spreads to the resin molding that thickness is about 1mm.After room temperature is dried, according to headstock hood shape, the resin molding that is cut into suitable size of cutting with a paper cutter is for subsequent use.
3. reinforcing material prepares:
According to headstock hood reinforcing material consumption, alkali-free glass fibre continuous felt, alkali-free glass fibre multi-axial fabric (purchased from Jiangsu Danyang Zhongya Glass Fiber Co., Ltd.) are cut into sizeable square, in 105 DEG C of baking ovens, dry 10h, for subsequent use.
4.PVC foam core material prepares:
By commercial 60kg/m
3pVC foam profile plate (purchased from Tianjin Sa Weisi chemical industry composite Co., Ltd) according to headstock hood shape, cut into the square that thickness is the suitable shape of 30mm, for subsequent use.
5. fibre bed lay:
On ready mould, successively after lay resin molding, 2 layers of continuous felt, 6 layers of multiaxial fabric, 1 layer of PVC foam, 2 layers of multiaxial fabric, 1 layer of continuous felt, 2 layers of multiaxial fabric, 1 layer of PVC foam and 6 layers of multiaxial fabric, according to walking adhesive process design, lay release cloth and flow-guiding screen in fibre bed, arrange gluing nozzle, walk sebific duct and excessive Jiao Zui.
6. vacuum bag film encapsulation:
In mold periphery apart from fibre bed 100mm place adhesive seal adhesive tape, and by vacuum bag film, all materials such as fibre bed are all sealed in vacuum bag film, then connection glue injection and vacuum line, check vacuum.
7.RFI resin molding infiltrates:
After vacuum is qualified, starts mold heating device, make mould be warming up to 60 DEG C, after insulation makes resin molding melting, under the vacuum pressures, the layer fabric reinforcement of impregnated fiber bed.
8. liquid resin infiltration:
By unsaturated polyester resin 9001-I-1, curing agent M50, promoter 5002-M-2(purchased from Nanjing DSM) mix according to 100:1.1:1.3 ratio, after stirring evenly, injected rubber hose is inserted in glue bucket, open injecting glue valve, glue is made to import in sealing die cavity under vacuum pressure effect, after walking the upper strata rapidly in shunting, impregnated fiber bed such as sebific duct, flow-guiding screen and middle level and strengthening fabric, close injecting glue valve.
9. integrally curing:
Maintain system vacuum, and in vacuum bag film covering and heat insulating cotton-wadded quilt, start mold heating device, make mould be warming up to 70 DEG C, insulation 6h, make the double-layer sandwich composite material solidification be sealed in vacuum bag film.
10. the demoulding and post processing:
Remove vacuum bag film and other auxiliary material, knock gently, double-layer sandwich composite headstock hood is separated with composite material mould, remove overlap, obtain double-layer sandwich composite headstock hood product.
The present embodiment adopts timesharing impregnation technology in Z-direction/face, manufacture experimently two-ply foam core filled composite material locomotive head cover structure, product surface and inner no significant defect, the composite headstock hood excellent performance made, under the condition of bearing equal load, than former individual layer Sandwich glass fibrous composite headstock hood loss of weight more than 40%.The various double-layer sandwich composite structure of trial-production all have passed load-carrying properties test, meets the requirement of design objective completely.
Claims (9)
1. the forming method of two-ply foam sandwich structure polymer matrix composites, it is characterized in that, liquid molding method is adopted to realize the global formation preparation of two-ply foam sandwich structure polymer matrix composites, comprise the following steps: can on heating work mould, adopt impregnation technology step by step, utilize the lower floor's preform in Resin Film Infusion method Z-direction dipping double-layer sandwich structure preform, then adopt the upper strata preform in vacuum importing method of molding importing liquid resin infusion double-layer sandwich structure preform and middle level preform; After having flooded, it is shaping the two layers of foam sandwich that upper, middle and lower layer preform and the centre of impregnated with resin are mingled with to be carried out co-curing, obtains two-ply foam sandwich structure polymer matrix composites.
2. forming method according to claim 1, it is characterized in that: described double-layer sandwich structure preform is seated in a surface resin film, described double-layer sandwich structure preform comprises lower floor's reinforcing material, lower floor's foam core, middle level reinforcing material, upper foam sandwich and upper strata reinforcing material from the bottom to top successively.
3. forming method according to claim 2, it is characterized in that: the described vacuum vacuum leading device imported in method of molding is arranged on the top of described double-layer sandwich structure preform, and utilize vacuum bag film described double-layer sandwich structure preform and resin molding to be encapsulated in the lump in vacuum importing method of molding.
4. forming method according to claim 2, is characterized in that: described resin molding is have functional form resin molding that is fire-retardant or anti-ultraviolet ageing function.
5. the forming method according to any one of Claims 1 to 4, it is characterized in that: before utilizing Resin Film Infusion method Z-direction to flood double-layer sandwich structure preform, first make work mould keep vacuum state by vacuumizing, then after making Resin Film Infusion by heating work mould, Z-direction flood double-layer sandwich structure preform.
6. forming method according to claim 5, is characterized in that: described vacuum state refers to that relative vacuum degree is not less than 0.95 atmospheric pressure/atm.
7. forming method according to claim 5, is characterized in that: describedly make the heating and temperature control of Resin Film Infusion at 60 DEG C ~ 70 DEG C by heating work mould.
8. forming method according to claim 5, is characterized in that: before adopting vacuum to import method of molding importing liquid resin infusion double-layer sandwich structure preform, close the heating system of described work mould.
9. forming method according to claim 6, it is characterized in that: carry out described co-curing by heating work mould again shaping, temperature when co-curing is shaping controls at 60 DEG C ~ 70 DEG C, and vacuum degree control is not less than 0.95 atmospheric pressure/atm at relative vacuum degree.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105216344B (en) * | 2015-09-15 | 2018-07-27 | 江苏金风科技有限公司 | Vacuum infusion molding process for compound |
| CN106426981A (en) * | 2016-09-30 | 2017-02-22 | 咸宁海威复合材料制品有限公司 | Method for gluing hard foam blocks by vacuum resin filling |
| CN106853707B (en) * | 2016-12-22 | 2018-12-18 | 长沙晶优新材料科技有限公司 | A kind of wave transparent component of multi-layered foamed sandwich and preparation method thereof can be applied to radome or satellite antenna cover |
| CN108819270A (en) * | 2018-05-03 | 2018-11-16 | 上海晋飞碳纤科技股份有限公司 | A kind of core material bonded structure and technique suitable for complex profile |
| CN109094058B (en) * | 2018-07-12 | 2021-06-08 | 湖北三江航天江北机械工程有限公司 | Light composite material bullet holder and its manufacturing method |
| CN110885534A (en) * | 2019-10-16 | 2020-03-17 | 浙江林境新材料科技有限公司 | Preparation method of antistatic composite material packing box |
| CN111570765A (en) * | 2020-06-23 | 2020-08-25 | 西安汇创贵金属新材料研究院有限公司 | Method for improving surface defects of double-layer mold cast ingot |
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