CN104262675A - Method for recovering carbon fibers from carbon fiber composite material - Google Patents
Method for recovering carbon fibers from carbon fiber composite material Download PDFInfo
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- CN104262675A CN104262675A CN201410440667.3A CN201410440667A CN104262675A CN 104262675 A CN104262675 A CN 104262675A CN 201410440667 A CN201410440667 A CN 201410440667A CN 104262675 A CN104262675 A CN 104262675A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a method for recovering carbon fibers from a carbon fiber composite material. The method comprises the following steps: 1. putting the carbon fiber composite material in a microwave oven, carrying out radiation heating treatment on the carbon fiber composite material in a protective atmosphere to initiate degradation reaction on the carbon fiber composite in the microwave oven, wherein the protective atmosphere is an inert gas or an inert gas-oxygen gas mixture, and the oxygen content in the gas mixture is less than or equal to 20v%; and 2. after finishing the degradation reaction, obtaining the solid product which is the recovered carbon fibers. The method can obtain the regenerated carbon fiber material with uniform performance, and effectively enhances the recovery rate of the carbon fibers.
Description
Technical field
The present invention relates to a kind of method reclaiming carbon fiber, particularly relate to a kind of method reclaiming carbon fiber from carbon-fibre composite.
Background technology
Carbon fiber-reinforced resin composite materials has that specific tenacity is high, specific modulus is high, the excellent properties such as thermotolerance and erosion resistance, is thus widely used in the industrial circle such as the Leisure Sport field such as aerospace field, golf club/tennis racket and automobile/wind-power electricity generation/electronic apparatus/medicine equipment.
The problem of process is all there is at carbon fiber-reinforced resin composite materials dead meals such as the scrap stock of production phase generation or the scrap products at the end of work-ing life.Carbon fiber-reinforced resin composite materials can only burning-off resin in the mode of burning, and carbon fiber still remains as residue, and therefore carbon fiber-reinforced resin composite materials waste is usually used as non-combustible solid waste, by land-fill method process.Landfill had both caused land resources to waste, and caused again the deterioration of surrounding enviroment.In addition, the carbon fiber containing high value in carbon fiber-reinforced resin composite materials, the mode of landfill can cause the huge waste of carbon fiber resource undoubtedly.
Prior art has disclosed multiplely decomposes the resin in waste carbon fiber-resin composite, and carbon fiber is wherein separated, thus realizes the method that carbon fiber reclaims.
Prior art disclosed resin decomposition method comprises thermolysis, inorganic acid decomposes, organic solvent decomposes and Asia/supercutical fluid decomposition etc.Organic solvent recovery obtains clean carbon fiber, but use a large amount of organic solvents in removal process, may produce environment and pollute, separated from solvent (separatory, extraction, distillation etc.) operating process after using is complicated, recovery is caused to cause cost height higher, and selective to the kind of the kind of carbon fiber-reinforced resin composite materials matrix resin, even solidifying agent in the method, be not applicable to all matrix resins.Due to the acid resistance that epoxy resin is lower, utilize the severe corrosive acid such as nitric acid can to degrade to epoxy resin, the recyclable carbon fiber obtaining surface clean.But the strong acid such as nitric acid due to corrodibility strong, higher to the requirement of conversion unit, and require higher to the safety coefficient of operation, post-reaction treatment is more difficult.Although supercritical water treatment method has the feature of cleanliness without any pollution, need carry out under the reaction conditions of High Temperature High Pressure, higher to the requirement of conversion unit, and degraded after product and water mix, not easily separated.Although and the fluid reaction conditionss such as overcritical alcohols comparatively supercritical water gentleness, but still belong to high-temperature high-voltage reaction.These methods are also in laboratory stage or pilot scale stage at present, also have a segment distance from real industrialization.
Prior art disclosed in what have commercial viability most is the method for thermal decomposition process waste carbon fiber-resin composite, thermolysis process comprises fluidized bed process and cracking process.Fluidized bed process wherein waste carbon fiber-resin composite is placed in warm air decompose, and the method is better to heterogeneous carbon fiber-reinforced resin composite materials waste effects such as process doping metals, and can operate continuously.But reclaim the carbon fiber that obtains because of oxidizing reaction serious, and because of at reactor, separator Deng Zhong strenuous exercise shock.So mechanical properties decrease is relatively more serious, and the method operation is comparatively complicated.Cracking process is method waste carbon fiber-resin composite being placed in the thermolysis of the atmosphere of inert gases such as nitrogen, helium, technological operation is simple, but reclaim the carbon fiber surface obtained and easily tie carbon, and the mode of traditional process furnace heating, cause the performance heterogeneity of the carbon fiber of acquisition because inside and outside reaction is asynchronous, the carbon fiber performance reclaimed also can reduce greatly.
Summary of the invention
Technical problem to be solved by this invention provides a kind of carbon-fibre composite that can obtain the homogeneous carbon fibre material of performance to reclaim the method for carbon fiber for the state of the art.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of carbon-fibre composite reclaims the method for carbon fiber, comprises the steps:
Step 1, carbon-fibre composite is positioned in microwave oven, in protective atmosphere, carry out irradiated heat process to described carbon-fibre composite, there is DeR in described carbon-fibre composite in microwave oven, and described protective atmosphere is the mixed gas of rare gas element or rare gas element and oxygen, in described mixed gas, oxygen content is less than or equal to 20v%, and wherein v% is volume percent, and such as oxygen content is 5v%, 10v%, 15v%;
Step 2, after DeR completes, the solid product of gained is the carbon fiber after recovery.
After there is scission reaction in carbon-fibre composite in microwave oven, the matrix resin cracking completely of carbon-fibre composite, product is divided into splitting gas compound (if the DeR time is shorter, the degraded product of matrix resin is liquid) and solid product, wherein, solid product is the carbon fiber after recovery.
Preferably, the microwave power of described microwave oven is 1KW ~ 100KW, such as 2KW, 10KW, 20KW, 50KW, 70KW.Under this microwave power, carbon-fibre composite can cracking completely.
Further preferably, the microwave power of described microwave oven is 1KW ~ 50KW, such as 5KW, 10KW, 20KW, 30KW, 40KW, and preferred microwave power is 2KW ~ 20KW.Under this microwave power, carbon-fibre composite can cracking obtain more abundant, makes the carbon fiber purity of recovery higher.
Preferably, in step 2, the time of DeR is less than or equal to 1 hour, and the preferred DeR time is 5s ~ 30min, such as 10s, 60s, 5min, 10min, 20min, and preferably the DeR time is 10s ~ 10min further.If the thermo-cracking time is greater than 1 hour, by exceeding resin completely by the time of thermo-cracking, causes the operational cycle long, losing time and heat energy, cause processing cost to increase.
Carbon-fibre composite directly can put into microwave oven, and the form that can obtain whole bundle is like this long stapled carbon fiber (i.e. long carbon fiber).
Irradiated area is connect in order to increase carbon-fibre composite, thus make cracking more abundant, also comprise step 1a before step 1, the pre-treatment of carbon-fibre composite, blocks is divided into by carbon-fibre composite, preferably being divided into rib long is 1cm ~ 50cm, the cubes of such as 5cm, 10cm, 20cm, 30cm, 40cm.Carbon-fibre composite is divided into fritter and can adopts crush method, cutting method, patterning method etc., after carbon-fibre composite is divided into fritter, be easy to be heated evenly, thus it is consistent to be conducive to scission reaction degree.This step is conducive to obtaining the carbon fiber (i.e. short carbon fiber) that form is staple fibre.
Wherein, the matrix resin in described carbon-fibre composite is one or more in thermoplastic resin or thermosetting resin.
Wherein, described thermoplastic resin comprises polypropylene, polyethylene, PC/ABS alloy (namely polycarbonate and acrylonitrile-butadiene-styrene copolymer and mixture, be the thermoplastic plastic rubber by polycarbonate (Polycarbonate) and polyacrylonitrile (ABS) alloy), polyester (the polymkeric substance general name obtained by polyvalent alcohol and polyprotonic acid polycondensation), nylon; Described thermosetting resin comprises epoxy resin, resol, Vinylite, unsaturated polyester resin.
In addition, thermoplastic resin can also be selected from other kinds, such as polyphenylene sulfide, polyether-ether-ketone, polysulfones, thermoplastic polyimide, polyarylester, liquid crystalline polymers, tetrafluoroethylene, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyoxymethylene, polymeric amide, polyphenylene oxide, polyethylene, polyvinyl chloride or polystyrene and acrylonitrile-butadiene-styrene copolymer.Thermosetting resin can also be selected from unsaturated polyester resin, urethane resin, polyimide resin, urea-formaldehyde resin, terpolycyantoamino-formaldehyde resin, silicone resin or furane resin.
Wherein, the carbon fiber in described carbon-fibre composite is asphalt base carbon fiber and/or acrylic carbon fibre.
Wherein, the form of the carbon fiber in described carbon-fibre composite is macrofiber and/or staple fibre.
Compared with prior art, the invention has the advantages that: the recovery method of this carbon fiber mainly utilizes microwave degradation to reclaim carbon fiber from carbon-fibre composite, utilize microwave radiation method, carbon-fibre composite inside can be made to be heated more even, and then the simultaneous object of the inside and outside DeR of carbon-fibre composite can be reached, thus the recycling carbon fibre material that availability is homogeneous, the carbon fibre material performance namely obtained is more excellent.
In addition, the recovery method of this carbon fiber improves the carbon fiber rate of recovery effectively; And, because significantly shortening the time of DeR, thus avoid the carbon fiber performance that carbon fiber long-term exposure causes under high temperature and be badly damaged, also greatly reduce energy consumption simultaneously.The method of this recovery carbon fiber is more efficient, energy-conservation, utilize present method reclaim from carbon-fibre composite the laboratory of carbon fiber the rate of recovery can up to 99.5% and more than, and be applied in actual production, the rate of recovery of carbon fiber also can reach 99% and more than.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope display figure that the embodiment of the present invention 1 reclaims the carbon fiber obtained.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Can reclaim in the carbon-fibre composite of carbon fiber containing matrix resin, carbon fiber, matrix resin is one or more in thermoplastic resin or thermosetting resin, such as, described thermoplastic resin comprises polypropylene, polyethylene, PC/ABS alloy, polyester, nylon, polyphenylene sulfide, polyether-ether-ketone, polysulfones, thermoplastic polyimide, polyarylester, liquid crystalline polymers, tetrafluoroethylene, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyoxymethylene, polymeric amide, polyphenylene oxide, polyethylene, polyvinyl chloride or polystyrene, one or more in acrylonitrile-butadiene-styrene copolymer, thermosetting resin comprise in epoxy resin, resol, Vinylite, unsaturated polyester resin, urethane resin, polyimide resin, urea-formaldehyde resin, terpolycyantoamino-formaldehyde resin, silicone resin or furane resin one or more.
Carbon fiber is asphalt base carbon fiber and/or acrylic carbon fibre, and the form of carbon fiber is macrofiber and/or staple fibre.
Embodiment 1
In the present embodiment, matrix resin is polypropylene, and carbon fiber is asphalt-based carbon fiber, and its form is macrofiber.
The carbon-fibre composite of the present embodiment reclaims the method for carbon fiber, comprises the steps:
Step 1: be positioned over by carbon-fibre composite in microwave oven, in protective atmosphere, carry out irradiated heat process to carbon-fibre composite, there is DeR in carbon-fibre composite in microwave oven.
In this step, protective atmosphere is the mixed gas of rare gas element or rare gas element and oxygen, and in mixed gas, oxygen content is less than or equal to 20v%.In the present embodiment, protective atmosphere is specially rare gas element---helium; The microwave power of microwave oven is 1KW ~ 100KW, is specially 5KW in the present embodiment.
Step 2: after DeR completes, the product that matrix resin degraded produces is gaseous state, and the solid product of gained is the carbon fiber after recovery.In this step, the DeR time is no more than 1 hour, and the present embodiment is specially 5min.
After DeR completes, solid product is pencil, and solid product is taken out microwave oven, trembles out gently, can obtain the long carbon fiber of a whole bundle, and in the present embodiment, the rate of recovery of carbon fiber is up to 99.8%.As shown in Figure 1, as shown in Figure 1, it is homogeneous that the present embodiment reclaims the carbon fiber performance obtained to the scanning electron microscope (SEM) photograph of the carbon fiber that the present embodiment obtains.
Embodiment 2
The present embodiment difference from Example 1 is: also comprise step 1a before step 1, the pre-treatment of carbon-fibre composite, be divided into blocks by carbon-fibre composite, in the present embodiment, specifically carbon-fibre composite cut into the long cubes for 50cm of rib.
The usage quantity of carbon-fibre composite before treatment and other steps are as embodiment 1, and after DeR completes, solid product is carbon fiber, and the rate of recovery is 99.7%, and the carbon fiber performance obtained is homogeneous.
Embodiment 3
The present embodiment difference from Example 1 is: in step 1, and the microwave power of microwave oven is 1KW, and in step 2, the DeR time is 1 hour.
The usage quantity of carbon-fibre composite before treatment and other steps are as embodiment 1, and the rate of recovery of the carbon fiber of the present embodiment is 99.5%, and the carbon fiber performance obtained is homogeneous.
Embodiment 4
The present embodiment difference from Example 1 is: in step 1; protective atmosphere is rare gas element---the mixed gas of helium and oxygen; in this mixed gas; oxygen content is 10v%; because there being the existence of oxygen, carbon fiber is easily oxidized, causes the rate of recovery lower than embodiment 1; be specially 99.2%, and the carbon fiber performance obtained is homogeneous.
In the present embodiment, the usage quantity of carbon-fibre composite before treatment and other steps are as embodiment 1.
Comparative example
The present embodiment difference from Example 1 is: use pyrolyzer to reclaim carbon fiber from carbon-fibre composite.
Specific practice is: the carbon-fibre composite with embodiment 1 equivalent is put into pyrolyzer, passes into nitrogen 5-10 minute after closing fire door tight, is discharged completely by air in burner hearth and forms inert environment.Be warming up to 350 DEG C to pyrolyzer, make the resin in carbon fiber-reinforced resin composite materials that heat scission reaction 2.0hr occur at such a temperature, split product discharges burner hearth with air-flow.Stop heating, treat that pyrolyzer temperature takes out cracking bottom product after being down to normal temperature.
The product that the present embodiment pyrolyzer carries out cracking is unordered block state of aggregation, the carbon residue that its remained on surface is formed after having resin pyrolysis gasification.To obtain pure carbon fiber, also need carbon residue to separate; And after high temperature, carbon fiber is unordered block state of aggregation, its form heterogeneity.
In addition, the carbon fiber performance heterogeneity that the present embodiment obtains, cannot obtain the carbon fiber of the excellent performance shown in Fig. 1.
Above content is only preferred embodiment of the present invention, and for those of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, this description should not be construed as limitation of the present invention.
Claims (9)
1. carbon-fibre composite reclaims a method for carbon fiber, it is characterized in that, comprises the steps:
Step 1, carbon-fibre composite is positioned in microwave oven, in protective atmosphere, irradiated heat process is carried out to described carbon-fibre composite, DeR is there is in described carbon-fibre composite in microwave oven, described protective atmosphere is the mixed gas of rare gas element or rare gas element and oxygen, and in described mixed gas, oxygen content is less than or equal to 20v%;
Step 2, after DeR completes, gained solid product is the carbon fiber after recovery.
2. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: the microwave power of described microwave oven is 1KW ~ 100KW.
3. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: the microwave power of described microwave oven is 1KW ~ 50KW, and preferred microwave power is 2KW ~ 20KW.
4. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: in step 2, the time of DeR is less than or equal to 1 hour, and the preferred DeR time is 5s ~ 30min, and preferably the DeR time is 10s ~ 10min further.
5. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: also comprise step 1a before step 1, the pre-treatment of carbon-fibre composite, is divided into blocks by carbon-fibre composite, is preferably divided into the long cubes for 1cm ~ 50cm of rib.
6. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: the matrix resin in described carbon-fibre composite is one or more in thermoplastic resin or thermosetting resin.
7. carbon-fibre composite according to claim 6 reclaims the method for carbon fiber, it is characterized in that: described thermoplastic resin comprises polypropylene, polyethylene, PC/ABS alloy, polyester, nylon, polyphenylene sulfide, polyether-ether-ketone, polysulfones, thermoplastic polyimide, polyarylester, liquid crystalline polymers, tetrafluoroethylene, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyoxymethylene, polymeric amide, polyphenylene oxide, polyethylene, polyvinyl chloride or polystyrene, acrylonitrile-butadiene-styrene copolymer;
Described thermosetting resin comprises epoxy resin, resol, Vinylite, unsaturated polyester resin, urethane resin, polyimide resin, urea-formaldehyde resin, terpolycyantoamino-formaldehyde resin, silicone resin or furane resin.
8. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: the carbon fiber in described carbon-fibre composite is asphalt base carbon fiber and/or acrylic carbon fibre.
9. carbon-fibre composite according to claim 1 reclaims the method for carbon fiber, it is characterized in that: the form of the carbon fiber in described carbon-fibre composite is macrofiber and/or staple fibre.
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| CN201410440667.3A CN104262675A (en) | 2014-09-01 | 2014-09-01 | Method for recovering carbon fibers from carbon fiber composite material |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105482154A (en) * | 2015-12-16 | 2016-04-13 | 华东理工大学 | Method for recycling carbon fibers from carbon-fiber-enhanced high polymer material based on induction heating effect |
| CN106750506A (en) * | 2016-12-29 | 2017-05-31 | 青海大学 | A kind of method that two-step thermal processing reclaims carbon fiber |
| CN108430724A (en) * | 2015-12-18 | 2018-08-21 | 康廷南拓结构塑料有限公司 | Recycle carbon fiber-based material |
| CN108610507A (en) * | 2018-04-19 | 2018-10-02 | 宁波诺丁汉新材料研究院有限公司 | A kind of method of high efficiente callback carbon fiber |
| CN108642882A (en) * | 2018-05-09 | 2018-10-12 | 东华大学 | A kind of method of carbon fiber surface modification |
| CN108640699A (en) * | 2018-04-28 | 2018-10-12 | 中国人民解放军国防科技大学 | Method for preparing carbon/carbon preformed body by recycling carbon fiber reinforced resin matrix composite material |
| CN108690218A (en) * | 2018-05-04 | 2018-10-23 | 宁波诺丁汉新材料研究院有限公司 | A kind of recovery method for the carbon fiber that can be directly recycled with high efficiente callback |
| TWI663192B (en) * | 2018-01-12 | 2019-06-21 | 永虹先進材料股份有限公司 | Carbon fiber recycling method |
| US10633535B2 (en) | 2017-02-06 | 2020-04-28 | Ticona Llc | Polyester polymer compositions |
| TWI719595B (en) * | 2019-08-20 | 2021-02-21 | 國立勤益科技大學 | Method for preparing composite material by using recycled carbon fiber |
| CN113021680A (en) * | 2021-03-12 | 2021-06-25 | 昆明理工大学 | Method for separating and recovering all components of waste sucker rod |
| CN113174086A (en) * | 2020-06-22 | 2021-07-27 | 中国石化集团胜利石油管理局有限公司电力分公司 | Low-cost recycling method for carbon fiber composite material |
| US11384238B2 (en) | 2018-02-08 | 2022-07-12 | Celanese Sales Germany Gmbh | Polymer composite containing recycled carbon fibers |
| CN116277616A (en) * | 2023-03-03 | 2023-06-23 | 南京航空航天大学 | Space recycling remanufacturing method |
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2014
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| EDWARD LESTER ET AL.: ""Microwave heating as a means for carbon fibre recovery from polymer composites: a technical feasibility study"", 《MATERIALS RESEARCH BULLETIN》 * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105482154A (en) * | 2015-12-16 | 2016-04-13 | 华东理工大学 | Method for recycling carbon fibers from carbon-fiber-enhanced high polymer material based on induction heating effect |
| CN108430724A (en) * | 2015-12-18 | 2018-08-21 | 康廷南拓结构塑料有限公司 | Recycle carbon fiber-based material |
| CN106750506A (en) * | 2016-12-29 | 2017-05-31 | 青海大学 | A kind of method that two-step thermal processing reclaims carbon fiber |
| CN106750506B (en) * | 2016-12-29 | 2019-07-12 | 青海大学 | A kind of method of two-step thermal processing recycling carbon fiber |
| US10633535B2 (en) | 2017-02-06 | 2020-04-28 | Ticona Llc | Polyester polymer compositions |
| TWI663192B (en) * | 2018-01-12 | 2019-06-21 | 永虹先進材料股份有限公司 | Carbon fiber recycling method |
| US11384238B2 (en) | 2018-02-08 | 2022-07-12 | Celanese Sales Germany Gmbh | Polymer composite containing recycled carbon fibers |
| US11993707B2 (en) | 2018-02-08 | 2024-05-28 | Celanese Sales Germany Gmbh | Polymer composite containing recycled carbon fibers |
| CN108610507A (en) * | 2018-04-19 | 2018-10-02 | 宁波诺丁汉新材料研究院有限公司 | A kind of method of high efficiente callback carbon fiber |
| CN108640699A (en) * | 2018-04-28 | 2018-10-12 | 中国人民解放军国防科技大学 | Method for preparing carbon/carbon preformed body by recycling carbon fiber reinforced resin matrix composite material |
| CN108640699B (en) * | 2018-04-28 | 2020-10-27 | 中国人民解放军国防科技大学 | Method for preparing carbon/carbon preformed body by recycling carbon fiber reinforced resin matrix composite material |
| CN108690218A (en) * | 2018-05-04 | 2018-10-23 | 宁波诺丁汉新材料研究院有限公司 | A kind of recovery method for the carbon fiber that can be directly recycled with high efficiente callback |
| CN108642882B (en) * | 2018-05-09 | 2020-02-11 | 东华大学 | Method for modifying surface of carbon fiber |
| CN108642882A (en) * | 2018-05-09 | 2018-10-12 | 东华大学 | A kind of method of carbon fiber surface modification |
| TWI719595B (en) * | 2019-08-20 | 2021-02-21 | 國立勤益科技大學 | Method for preparing composite material by using recycled carbon fiber |
| CN113174086B (en) * | 2020-06-22 | 2022-07-29 | 中国石化集团胜利石油管理局有限公司电力分公司 | Low-cost recycling method for carbon fiber composite material |
| CN113174086A (en) * | 2020-06-22 | 2021-07-27 | 中国石化集团胜利石油管理局有限公司电力分公司 | Low-cost recycling method for carbon fiber composite material |
| CN113021680A (en) * | 2021-03-12 | 2021-06-25 | 昆明理工大学 | Method for separating and recovering all components of waste sucker rod |
| CN116277616A (en) * | 2023-03-03 | 2023-06-23 | 南京航空航天大学 | Space recycling remanufacturing method |
| CN116277616B (en) * | 2023-03-03 | 2024-05-17 | 南京航空航天大学 | Space recycling remanufacturing method |
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Application publication date: 20150107 |