CN106631083B - A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber - Google Patents
A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
- B60L5/18—Current collectors for power supply lines of electrically-propelled vehicles using bow-type collectors in contact with trolley wire
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
The present invention discloses a kind of preparation method of pantograph pan chopped carbon fiber enhancing carbon/carbon compound material.Slurry is made in chopped carbon fiber, mesophase pitch powder and dispersing agent into the water；Slurry is poured into canister, freeze-drying in freeze drying equipment is put into, carbon fiber reinforcement is made；The carbon fiber reinforcement of preparation is pressed and molded, green body is made；Carbonization treatment is carried out to the green body of preparation；By resulting materials after carbonization treatment, mesophase pitch is impregnated；Resulting materials carry out carbonization treatment after mesophase pitch will be impregnated；Repeated impregnations-carbonization 4 ~ 6 times；Graphitization processing is to get target material.Chopped carbon fiber enhancing carbon/carbon compound material prepared by the present invention has good electric conductivity, shock resistance good, overcomes the weak defect of poorly conductive, the impact resistance of the carbon/carbon compound material pantograph pan of prior art preparation.
Description
Technical field
The invention belongs to the preparation fields of pantograph pan, and in particular to a kind of pantograph pan is enhanced with chopped carbon fiber
The preparation method of carbon/carbon compound material.
Background technique
By in September, 2016, China railways do business course more than 120,000 kilometers, and wherein high-speed railway is more than 20,000 public affairs
In, the target of country's " long-term railway network planning of China " is realized in advance.With the speed of the train to go at express speed on high-speed railway
Raising, correspondingly also bring numerous matter of science and technology.The pantograph pan of bullet train connects with contact net lines sliding
Touching, is transferred to train for the load current of 500A or so, and increasingly harsher requirement is proposed to sliding material performance.At present by electricity
The bow common material of slide plate mainly has: powder shaped charge liner, carbon slipper, metal-impregnated carbon slide.But in above-mentioned three kinds of slide plates
Find in use process: serious wear, the arc resistant ability of powder shaped charge liner contact line conducting wire are weak；The mechanical strength of carbon slipper
Low, poor impact resistance meets conducting wire hard spot and be easy to cause slide plate fracture or chip off-falling；It is sliding that metal-impregnated carbon slide combines powder metallurgy
Also the shortcomings that powder shaped charge liner and carbon slipper are remained while the advantages of plate and carbon slipper, such as: the shock resistance of carbon slipper
Ability is low, mechanical strength is relatively low, and fracture and chip off-falling are easy to appear in operation；Powder shaped charge liner is big to the abrasion of conducting wire,
It easily sticks together with conducting wire in operation.
The shortcomings that overcome metal-impregnated carbon slide, improves the performance of sliding material, reduces cost, and researcher increases to fibre
The research of dimension enhancing composite material slide plate, such as (application number: 97106646.9) " use for electric locomotive carbon ~ carbon is multiple for patent of invention
Condensation material pantograph pan " discloses a kind of use to plate copper powders as basis material, using short carbon fiber as reinforcing agent, with heat
Thermosetting resin as binder, using hygrometric state or dry state mixed-forming preparation by electrician's slide plate method.Using this method,
(1) it needs to carry out copper plating treatment to carbon dust (graphite powder or coke powder), increases equipment investment, and carbon dust copper coating
Unevenly, it is unfavorable for improving the electrical conduction performance of sliding material；(2) preparation method highest only at 180 DEG C to blank at
Reason, treatment temperature is low, cannot give full play to the wear-resisting and good mechanical performance of carbon material slide plate；(3) this method production cycle
Length, higher cost, mass production ability are poor.(application number: 201310308748.3) " one kind is for high speed for patent of invention
Train pantograph slide plate carbon/carbon ~ graphite composite material preparation method " discloses a kind of composite material slide plate preparation method.
Specific step is as follows for this method: preparing graphite suspension impregnated graphite suspension into carbon felt and prepares graphite precast body pair
Impregnation carbonization obtains carbon/carbon ~ graphite composite material to graphite precast body repeatedly.Graphite particle in this method, in suspension
Or graphite powder is not easy to be impregnated into carbon felt, and the graphite being impregnated into causes it to be distributed uneven there is also gradient distribution, so that
Slide plate poor mechanical property.
Summary of the invention
To overcome poorly conductive, the impact resistance of the carbon/carbon compound material pantograph pan of prior art preparation weak
Defect, the purpose of the present invention are intended to provide a kind of preparation side of pantograph pan chopped carbon fiber enhancing carbon/carbon compound material
Method, the carbon/carbon compound material electric conductivity of this method preparation is excellent, shock resistance is good.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber, and steps are as follows:
(1) slurry is made in chopped carbon fiber, mesophase pitch powder and dispersing agent into the water；Wherein, the chopped carbon
Fiber accounts for 20 ~ 70wt% of both chopped carbon fiber and mesophase pitch powder gross mass, chopped carbon fiber and mesophase pitch powder
The two gross mass accounts for the 40 ~ 60% of water quality, and the dispersing agent accounts for 0.5 ~ 2.0wt% of water quality；
(2) slurry prepared by step (1) is poured into canister, is put into freeze-drying in freeze drying equipment, is made
Carbon fiber reinforcement；
(3) carbon fiber reinforcement of step (2) preparation is pressed and molded, green body is made；
(4) carbonization treatment is carried out to the green body of step (3) preparation；
(5) take mesophase pitch powder, after thawing, then by after step (4) carbonization treatment resulting materials dipping liquid phase centre
Asphalt phase；
(6) resulting materials carry out carbon under treatment conditions identical with step (4) after step (5) being impregnated mesophase pitch
Change processing；
(7) step (5) and (6) 4 ~ 6 times are repeated；
(8) graphitization processing is to get target material.
Most preferably, the chopped carbon fiber accounts for the 30wt% of both chopped carbon fiber and mesophase pitch powder gross mass, is chopped
Both carbon fiber and mesophase pitch powder gross mass account for the 50wt% of water quality, and the dispersing agent accounts for the 1.5wt% of water quality.
Further, step (2) specifically: slurry prepared by step (1) is poured into canister, freeze-drying is put into
In machine, it is refrigerated to -50 ~ -30 DEG C under vacuum, keeps the temperature 20 ~ 40 min；- 20 ~ -10 DEG C are warming up to, heat preservation 20 ~ 40
min；- 10 ~ -5 DEG C are continuously heating to, 20 ~ 40 min are kept the temperature；It is continuously heating to -1 ~ 0 DEG C, heat preservation is to being completely dried；It lets out
Vacuum is taken out to get carbon fiber reinforcement；During the entire process of step (2), heated up with the heating rate of 2 ~ 5 DEG C/h.This hair
Bright freeze-drying takes substep to heat up and control heating rate, can preferably control the rate of moisture evaporation, reach control carbon fiber
The effect of hole in reinforcement is tieed up, while carbon fiber may be implemented along xy and z to being uniformly distributed, to obtain the preferable mesh of performance
Mark material.
Preferably, the chopped carbon fiber is the mesophase pitch-based carbon fibers that are chopped, and the length is 1 ~ 50 mm.
Preferably, in step (1) and (5), the granularity of the mesophase pitch powder is 100 ~ 500 mesh.
Preferably, the dispersing agent is polyacrylamide, Sodium Polyacrylate or hydroxyethyl cellulose.
Preferably, in step (3), compression molding temperature is 200 ~ 300 DEG C, and briquetting pressure is 5 ~ 30 MPa, pressure maintaining
2 ~ 6 h of time.
Preferably, step (4) specifically: green body prepared by step (3) is placed in carbide furnace, with 15 ~ 25 DEG C/h
Heating rate be warming up to 300 ~ 400 DEG C；600 ~ 700 DEG C are continuously heating to again with the heating rate of 2 ~ 5 DEG C/h；Again with 5
The heating rate of ~ 15 DEG C/h is continuously heating to 900 ~ 1000 DEG C, keeps the temperature 1 ~ 3h；Cooling.
Preferably, in step (5), dipping temperature is 300 ~ 400 DEG C, and impregnation pressure is 1 ~ 15MPa, and the dwell time is
2 ~ 6 h。
Preferably, in step (8), graphitization processing temperature is 2100 ~ 2700 DEG C, and soaking time is 2 ~ 6 h.
The utility model has the advantages that
1, the present invention using intermediate phase pitch-based chopped carbon fiber as reinforcement, using mesophase pitch powder as bonding agent with
Impregnating agent has been prepared pantograph chopped carbon fiber using freeze-drying, compression molding, pressure impregnation-carbonization method and has been increased
Strong carbon/carbon compound material overcomes poorly conductive, the shock resistance of the carbon/carbon compound material pantograph pan of prior art preparation
The weak defect of ability；
2, according to the difference of pantograph pan structure, the canister of Shi Keyong different shape and size, tool are freeze-dried
Structured controllability；
3, chopped carbon fiber enhancing carbon/carbon compound material prepared by the present invention has good electric conductivity, shock resistance
It is good, it can be used for high-speed train pantograph slide plate and brush.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is described further.It should be understood that following embodiment is merely to illustrate
The range of the present invention and is not intended to limit the present invention.
Embodiment 1
A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber, and steps are as follows:
(1) by chopped mesophase pitch-based carbon fibers (length 1mm), mesophase pitch powder (100 mesh of granularity) and dispersion
Slurry is made in agent into the water；Wherein, both chopped carbon fiber and mesophase pitch powder account for the 50wt% of water quality, described to be chopped
The mass ratio of carbon fiber and mesophase pitch powder is 7:3, and the dispersing agent accounts for the 1.5wt% of water quality；The dispersing agent is poly- third
Acrylamide；
(2) slurry prepared by step (1) is poured into canister, is put into freeze drier, is refrigerated to -30 under vacuum
DEG C, keep the temperature 30min；- 20 DEG C are continuously heating to the heating rate of 5 DEG C/h, keeps the temperature 30min；Again with the heating rate of 5 DEG C/h after
It is continuous to be warming up to -5 DEG C, keep the temperature 30min；- 1 DEG C is continuously heating to the heating rate of 5 DEG C/h again, and heat preservation is to being completely dried；It lets out true
Sky takes out to get carbon fiber along xy and z to equally distributed carbon fiber reinforcement；
(3) carbon fiber reinforcement of step (2) preparation is pressed and molded, compression molding temperature is 200 DEG C, molding pressure
Power is 10MPa, dwell time 2h, and green body is made；
(4) carbonization treatment: green body prepared by step (3) is placed in carbide furnace, is heated up with the heating rate of 20 DEG C/h
To 350 DEG C；650 DEG C are continuously heating to again with the heating rate of 5 DEG C/h；950 are continuously heating to again with the heating rate of 10 DEG C/h
DEG C, keep the temperature 2 h；Power-off is cooled to room temperature；
(5) it takes mesophase pitch powder (100 mesh of granularity) to be put into high-pressure impregnation tank, after heating is melted, step (4) is carbonized
Resulting materials are put into high-pressure impregnation tank after processing, impregnate liquid phase mesophase pitch, and dipping temperature is 300 DEG C, and impregnation pressure is
5MPa, dwell time 2h；
(6) resulting materials carry out carbon under treatment conditions identical with step (4) after step (5) being impregnated mesophase pitch
Change processing；
(7) step (5) and (6) 5 times are repeated；
(8) graphitization processing, graphitization processing temperature are 2500 DEG C, and soaking time is 2h to get target material.
Chopped carbon fiber obtained enhancing carbon/carbon compound material performance is tested: density of material 1.78g/cm3,
Impact flexibility 0.51J/cm2, resistivity is 6.6 μ Ω m.
Embodiment 2
A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber, and steps are as follows:
(1) by chopped mesophase pitch-based carbon fibers (length 25mm), mesophase pitch powder (250 mesh of granularity) and dispersion
Slurry is made in agent into the water；Wherein, both chopped carbon fiber and mesophase pitch powder account for the 50wt% of water quality, described to be chopped
The mass ratio of carbon fiber and mesophase pitch powder is 5:5, and the dispersing agent accounts for the 1.5wt% of water quality；The dispersing agent is poly- third
Olefin(e) acid sodium；
(2) slurry prepared by step (1) is poured into canister, is put into freeze drier, is refrigerated to -40 under vacuum
DEG C, keep the temperature 30min；- 20 DEG C are continuously heating to the heating rate of 5 DEG C/h, keeps the temperature 30min；Again with the heating rate of 5 DEG C/h after
It is continuous to be warming up to -5 DEG C, keep the temperature 30min；- 1 DEG C is continuously heating to the heating rate of 5 DEG C/h again, and heat preservation is to being completely dried；It lets out true
Sky takes out to get carbon fiber along xy and z to equally distributed carbon fiber reinforcement；
(3) carbon fiber reinforcement of step (2) preparation is pressed and molded, compression molding temperature is 250 DEG C, molding pressure
Power is 20MPa, dwell time 2h, and green body is made；
(4) carbonization treatment: green body prepared by step (3) is placed in carbide furnace, is heated up with the heating rate of 20 DEG C/h
To 350 DEG C；650 DEG C are continuously heating to again with the heating rate of 5 DEG C/h；950 are continuously heating to again with the heating rate of 10 DEG C/h
DEG C, keep the temperature 2 h；Power-off is cooled to room temperature；
(5) it takes mesophase pitch powder (250 mesh of granularity) to be put into high-pressure impregnation tank, after heating is melted, step (4) is carbonized
Resulting materials are put into high-pressure impregnation tank after processing, impregnate liquid phase mesophase pitch, and dipping temperature is 350 DEG C, and impregnation pressure is
10MPa, dwell time 2h；
(6) resulting materials carry out carbon under treatment conditions identical with step (4) after step (5) being impregnated mesophase pitch
Change processing；
(7) step (5) and (6) 5 times are repeated；
(8) graphitization processing, graphitization processing temperature are 2500 DEG C, and soaking time is 2h to get target material.
Chopped carbon fiber obtained enhancing carbon/carbon compound material performance is tested: density of material 1.81g/cm3,
Impact flexibility 0.52J/cm2, resistivity is 5.2 μ Ω m.
Embodiment 3
A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber, and steps are as follows:
(1) by chopped mesophase pitch-based carbon fibers (length 50mm), mesophase pitch powder (500 mesh of granularity) and dispersion
Slurry is made in agent into the water；Wherein, both chopped carbon fiber and mesophase pitch powder account for the 50wt% of water quality, described to be chopped
The mass ratio of carbon fiber and mesophase pitch powder is 3:7, and the dispersing agent accounts for the 1.5wt% of water quality；The dispersing agent is hydroxyl second
Base cellulose；
(2) slurry prepared by step (1) is poured into canister, is put into freeze drier, is refrigerated to -50 under vacuum
DEG C, keep the temperature 30min；- 20 DEG C are continuously heating to the heating rate of 5 DEG C/h, keeps the temperature 30min；Again with the heating rate of 5 DEG C/h after
It is continuous to be warming up to -5 DEG C, keep the temperature 30min；- 1 DEG C is continuously heating to the heating rate of 5 DEG C/h again, and heat preservation is to being completely dried；It lets out true
Sky takes out to get carbon fiber along xy and z to equally distributed carbon fiber reinforcement；
(3) carbon fiber reinforcement of step (2) preparation is pressed and molded, compression molding temperature is 300 DEG C, molding pressure
Power is 30MPa, dwell time 2h, and green body is made；
(4) carbonization treatment: green body prepared by step (3) is placed in carbide furnace, is heated up with the heating rate of 20 DEG C/h
To 350 DEG C；650 DEG C are continuously heating to again with the heating rate of 5 DEG C/h；950 are continuously heating to again with the heating rate of 10 DEG C/h
DEG C, keep the temperature 2 h；Power-off is cooled to room temperature；
(5) it takes mesophase pitch powder (500 mesh of granularity) to be put into high-pressure impregnation tank, after heating is melted, step (4) is carbonized
Resulting materials are put into high-pressure impregnation tank after processing, impregnate liquid phase mesophase pitch, and dipping temperature is 375 DEG C, and impregnation pressure is
15MPa, dwell time 2h；
(6) resulting materials carry out carbon under treatment conditions identical with step (4) after step (5) being impregnated mesophase pitch
Change processing；
(7) step (5) and (6) 5 times are repeated；
(8) graphitization processing, graphitization processing temperature are 2500 DEG C, and soaking time is 2h to get target material.
Chopped carbon fiber obtained enhancing carbon/carbon compound material performance is tested: density of material 1.86g/cm3,
Impact flexibility 0.57J/cm2, resistivity is 3.5 μ Ω m.
Reference examples 3 '
With embodiment 3 the difference is that: step (2) be freeze-dried when take single step to heat up, detailed process are as follows:
Slurry prepared by step (1) is poured into canister, is put into freeze drier, -50 DEG C are refrigerated under vacuum, heat preservation
30min；- 1 DEG C is directly warming up to the heating rate of 5 DEG C/h, and heat preservation is to being completely dried；Vacuum is let out, is taken out to get carbon fiber increasing
Qiang Ti.
Chopped carbon fiber obtained enhancing carbon/carbon compound material performance is tested: density of material 1.76g/cm3,
Impact flexibility 0.37J/cm2, resistivity is 5.2 μ Ω m.
Conclusion:
1, through the foregoing embodiment known to 1 ~ 3: the chopped carbon fiber enhancing of the preparation of method provided by according to the present invention
Density, impact flexibility, the electric conductivity of carbon/carbon compound material are all satisfied the requirement as High Speed Railway Trains pantograph pan, only
The chopped carbon fiber of preparation enhancing carbon/carbon compound material need to be carried out processing according to the mechanical drawing of pantograph pan can be obtained
Pantograph pan.In the above three embodiments, when especially the mass ratio of chopped carbon fiber and mesophase pitch powder is 3:7,
Density and shock resistance is best, resistivity is minimum；
2, by embodiment 3 is with reference examples 3 ': under conditions of other conditions are identical, this hair is pressed in freeze-drying
Density, impact flexibility, the electric conductivity of the chopped carbon fiber enhancing carbon/carbon compound material of bright substep heating mechanism preparation are significant excellent
In single step heating mechanism.This is because being heated up using multiple step format, and control heating rate and can control the rate of water volatilization, reaches
Control the effect of hole in carbon fiber reinforcement, at the same realize carbon fiber along xy and z to being uniformly distributed, the performance of the material of acquisition
More preferably.
Embodiment described above, only presently preferred embodiments of the present invention, the range being not intended to limit the invention, the present invention
Above-described embodiment can also make a variety of changes.I.e. all claims applied according to the present invention and description institute
Simple, the equivalent changes and modifications made, fall within the claims of the invention patent.The not detailed description of the present invention
It is routine techniques content.
Claims (9)
1. the preparation method that a kind of pantograph pan enhances carbon/carbon compound material with chopped carbon fiber, which is characterized in that step is such as
Under:
(1) slurry is made in chopped carbon fiber, mesophase pitch powder and dispersing agent into the water；Wherein, the chopped carbon fiber
Account for 20 ~ 70wt% of both chopped carbon fiber and mesophase pitch powder gross mass, both chopped carbon fiber and mesophase pitch powder
Gross mass accounts for 40 ~ 60 wt% of water quality, and the dispersing agent accounts for 0.5 ~ 2.0wt% of water quality；
(2) slurry prepared by step (1) is poured into canister, is put into freeze drier, it is refrigerated to -50 under vacuum ~ -
30 DEG C, keep the temperature 20 ~ 40 min；- 20 ~ -10 DEG C are warming up to, 20 ~ 40 min are kept the temperature；- 10 ~ -5 DEG C are continuously heating to,
Keep the temperature 20 ~ 40 min；It is continuously heating to -1 ~ 0 DEG C, heat preservation is to being completely dried；Vacuum is let out, is taken out, fibre reinforced is made
Body；
(3) carbon fiber reinforcement of step (2) preparation is pressed and molded, green body is made；
(4) carbonization treatment is carried out to the green body of step (3) preparation；
(5) take mesophase pitch powder, after thawing, then by after step (4) carbonization treatment resulting materials dipping liquid phase interphase drip
It is green；
(6) resulting materials carry out at carbonization under treatment conditions identical with step (4) after step (5) being impregnated mesophase pitch
Reason；
(7) step (5) and (6) 4 ~ 6 times are repeated；
(8) graphitization processing is to get target material.
2. preparation method according to claim 1, it is characterised in that: the chopped carbon fiber accounts for chopped carbon fiber and centre
The 30wt% of both asphalt phase powder gross mass, both chopped carbon fiber and mesophase pitch powder gross mass account for the 50wt% of water quality,
The dispersing agent accounts for the 1.5wt% of water quality.
3. preparation method according to claim 1, it is characterised in that: the chopped carbon fiber is the intermediate phase pitch-based that is chopped
Carbon fiber, the length is 1 ~ 50 mm.
4. preparation method according to claim 1, it is characterised in that: in step (1) and (5), the mesophase pitch powder
Granularity be 100 ~ 500 mesh.
5. preparation method according to claim 1, it is characterised in that: the dispersing agent is polyacrylamide, polyacrylic acid
Sodium or hydroxyethyl cellulose.
6. preparation method according to claim 1, it is characterised in that: in step (3), compression molding temperature be 200 ~
300 DEG C, briquetting pressure is 5 ~ 30 MPa, 2 ~ 6 h of dwell time.
7. preparation method according to claim 1, which is characterized in that step (4) specifically: the base for preparing step (3)
Body is placed in carbide furnace, is warming up to 300 ~ 400 DEG C with the heating rate of 15 ~ 25 DEG C/h；Again with the heating of 2 ~ 5 DEG C/h
Rate is continuously heating to 600 ~ 700 DEG C；900 ~ 1000 DEG C are continuously heating to the heating rate of 5 ~ 15 DEG C/h again, heat preservation 1
~ 3h；Cooling.
8. preparation method according to claim 1, it is characterised in that: in step (5), dipping temperature is 300 ~ 400 DEG C,
Impregnation pressure is 1 ~ 15MPa, and the dwell time is 2 ~ 6 h.
9. preparation method according to claim 1, it is characterised in that: in step (8), graphitization processing temperature be 2100 ~
2700 DEG C, soaking time is 2 ~ 6 h.
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| CN201610868451.6A CN106631083B (en) | 2016-09-30 | 2016-09-30 | A kind of pantograph pan enhances the preparation method of carbon/carbon compound material with chopped carbon fiber |
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| CN107916466A (en) * | 2017-11-28 | 2018-04-17 | 株洲科威铁路配件有限公司 | Carbon fibre material and preparation method and application, the method for preparation pantograph sliding block |
| CN110436950B (en) * | 2019-08-15 | 2022-02-08 | 合肥工业大学 | Preparation method of carbon/carbon composite pantograph sliding plate material with high-component carbon fibers |
| CN111675547B (en) * | 2020-07-07 | 2022-12-13 | 湖南东映碳材料科技有限公司 | Quasi-isotropic high-thermal-conductivity C/C composite material and preparation method thereof |
| CN113584940A (en) * | 2021-06-24 | 2021-11-02 | 浙江超探碳纤维科技有限公司 | Preparation method of carbon fiber paper |
| CN114039256B (en) * | 2021-12-23 | 2024-01-09 | 捷和电机制品(深圳)有限公司 | Asphalt-based carbon fiber reinforced copper-based graphite motor carbon brush and preparation method thereof |
| CN115894062A (en) * | 2022-12-26 | 2023-04-04 | 内蒙古航天红岗机械有限公司 | Low-cost carbon/graphite throat lining material and preparation method thereof |
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