CN110981482A - Preparation method of metal-impregnated current collector material for subway - Google Patents
Preparation method of metal-impregnated current collector material for subway Download PDFInfo
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- CN110981482A CN110981482A CN201911153653.2A CN201911153653A CN110981482A CN 110981482 A CN110981482 A CN 110981482A CN 201911153653 A CN201911153653 A CN 201911153653A CN 110981482 A CN110981482 A CN 110981482A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/524—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from polymer precursors, e.g. glass-like carbon material
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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
- B60L5/38—Current collectors for power supply lines of electrically-propelled vehicles for collecting current from conductor rails
- B60L5/39—Current collectors for power supply lines of electrically-propelled vehicles for collecting current from conductor rails from third rail
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
Abstract
The invention relates to the field of preparation of current collectors, in particular to a preparation method of a metal-impregnated current collector material for subways. Secondly, preparing the metal impregnated carbon material by using a new technical process, namely putting the sintered carbon material primary blank into a sealed impregnation tank, vacuumizing, injecting high-temperature copper water, and performing pressure impregnation treatment to obtain the metal impregnated carbon material. Thereby increasing the bulk density of the carbon material and improving the mechanical strength, corrosion resistance and oxidation resistance.
Description
Technical Field
The invention relates to the field of preparation of current collectors, in particular to a preparation method of a metal-impregnated current collector material for subways.
Background
The current collector is also called a collector shoe, and is a set of dynamic current collecting equipment which is arranged on a train bogie and is used for dynamically collecting current from a rigid power supply rail (a third rail) for a train so as to meet the power requirement of the train. On the basis of systematic research on the operation posture of an urban rail train, the arrangement mode and characteristics of steel-aluminum composite power supply rails, the technical requirements of dynamic current collection, the electrical insulation requirements, the matching requirements of friction pairs of dynamic current collection and the like, the motion range of a swing rod piece, the contact positive pressure of the current collection friction pairs and the materials of current collection sliding shoes are scientifically and reasonably selected, the structure and the insulation structure of a current collection assembly are scientifically and reasonably designed, the working condition requirements of dynamic current collection of the train are met, the maintenance requirements of a current collector are reduced, the dynamic stability and reliable current collection of the train are realized, and the power supply guarantee is provided for the stable operation of the train.
The current collectors are power receiving devices for connecting trains and subway contact rails, and are generally arranged below doors on two sides of the trains, and two current collectors are arranged on one side of each train. The voltage of the rail power supply system is lower than that of a contact network system, and the contact network can generally provide alternating current of 25000 volts or more.
At present, the subway current collector mostly uses iron and copper sliding blocks, the main components are copper, iron, silicon, zinc and the like, the better conductivity of the sliding blocks is only utilized, but the friction coefficient of the sliding blocks with three rails is larger, and because the manufacturing process of the iron and copper blocks is not complex, the sliding blocks are mostly produced by small enterprises, the change of internal components is larger, so that the sliding blocks have the defects of unstable quality, unsatisfactory safety and reliability, short service life and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a preparation method of a metal-impregnated current collector material for a subway.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a metal-impregnated current collector material for a subway comprises the following steps:
s1, aggregate: mixing asphalt coke, calcined petroleum coke, a nano carbon material, special graphite powder and carbon fiber through crushing, grinding, screening and batching to obtain aggregate;
s2, dry mixing: putting the S1 into a kneading pot, stirring at the speed of 45r/min for 30-40min, and dry mixing at the temperature of 160 ℃ and 180 ℃;
s3, wet mixing: injecting medium-temperature asphalt into a kneading pot in S2 through an asphalt pipeline to be fully and uniformly stirred with aggregate to obtain paste;
s4, granulating: placing the paste obtained in the step S3 in a sheet rolling machine for rolling, and after the rolling and airing, preparing the paste into particles with the particle size of 2mm by a Raymond mill;
s5, extrusion: feeding the particles in the S4 into a preheating cylinder of a screw extruder through a pipeline, carrying out preheating treatment at 180 ℃, and then carrying out screw extrusion to obtain a green product, wherein the volume density of the green product is more than or equal to 1.77g/cm3(ii) a Pre-pressing under 6-8MPa before extrusion; the extrusion pressure is 10-15MPa, and the inside is ensuredWhile the structure is realized, the pores are reduced, and the tissue compactness is improved;
s6, roasting: carrying out heat treatment on the green product in S5 in an electric furnace in nitrogen atmosphere under the condition of air isolation to obtain a primary roasted product with the required volume density of more than or equal to 1.75g/cm3；
S7, dipping: placing the primary roasted product in S6 into a graphite tank for preheating treatment, then placing the graphite tank into a sealed impregnation tank, vacuumizing the impregnation tank, injecting high-temperature copper water into the impregnation tank when the vacuum degree is 0.05Mpa, then pressurizing the impregnation tank, and performing pressurized impregnation treatment to obtain the metal-impregnated carbon material, wherein the pressure of the pressurized impregnation treatment is 0.5Mpa, the time of the pressurized impregnation treatment is 5-10min, and the weight gain of the primary roasted product is 5-7%;
s8, machining the carbon material impregnated in the S7 into a required shape;
and S9, uniformly coating conductive adhesive on the periphery of the processed metal-impregnated carbon material of S8 under a sealed condition, and then carrying out heating and curing treatment to prepare the metal-impregnated current collector material for the subway.
Further, the true density of the asphalt coke is more than or equal to 2.0g/cm3Ash content is less than 0.5 percent, and volatile matter is less than 0.8 percent; the true density of the calcined petroleum coke is more than or equal to 2.13g/cm3Ash content is less than or equal to 0.20 percent, volatile matter is less than or equal to 0.25 percent, and sulfur content is less than or equal to 0.40 percent. The tensile modulus of the nano carbon material is less than or equal to 1.01TPa, and the ultimate strength is less than or equal to 116 Gpa; the volume density of the special graphite powder is more than or equal to 1.75g/cm3Resistivity is less than or equal to 6.0 mu omega m, breaking strength is more than or equal to 28Mpa, compressive strength is more than or equal to 32Mpa, porosity is less than or equal to 12%, ash content is less than or equal to 0.10%, and thermal expansion coefficient is less than or equal to 2 x 10-6/° c; the volume density of the carbon fiber is more than or equal to 1.85g/cm3(ii) a The softening point of the medium-temperature pitch is 83-86 ℃, the coking value is more than or equal to 58%, the ash content is less than or equal to 0.25%, and the quinoline insoluble substance is less than or equal to 0.30%; volume density of molten copper is 8.92g/cm3Melting point 1100 ℃ and boiling point 2600 ℃.
Furthermore, the particle size of the asphalt coke is more than 0.5 mu m and less than or equal to 2 mu m and is 55-60 percent; 40-45% of the particles with the particle size less than or equal to 0.15 mu m; the nano carbon material has a particle size of 0.3-0.8 μm, a tensile modulus of less than or equal to 1.01TPa and an ultimate strength of less than or equal to 116 Gpa; the particle size of the special graphite powder is 0.5-1 μm; the particle size of the carbon fiber is 0.1-0.5 μm;
the crushed grain size range and the content of the calcined petroleum coke are as follows:
0.45 mu m < the particle size is less than or equal to 0.33 mu m and 5-15 wt%;
0.33 mu m < 15-25 wt% with the particle size less than or equal to 0.10 mu m;
0.10 mu m < 25-30 wt% with the particle size less than or equal to 0.70 mu m;
0< particle size <0.70 μm 40-45 wt%;
preferably: the crushed grain size range and the content of the calcined petroleum coke are as follows according to the weight percentage:
0.45 μm < particle size less than or equal to 0.33 μm 5 wt%;
0.33 μm < particle size less than or equal to 0.10 μm 15 wt%;
0.10 μm < 30wt% with particle size less than or equal to 0.70 μm;
0< particle size <0.70 μm 40 wt%.
Further, the weight ratio of the pitch coke, the carbon fiber, the nano carbon material, the special graphite powder and the calcined petroleum coke is 15-20: 5-10: 3-5: 15-20: 60 to 65 percent; the weight ratio of the aggregate to the medium-temperature asphalt is 70-75:25-30, preferably 72: 28.
Further, the medium temperature coal tar pitch was heated to 220 ℃ before wet mixing.
Further, the heat treatment process in S6 specifically includes: heating the green product from 150 ℃ to 550 ℃ at a heating rate of 1.1-2.1 ℃/h; then raising the temperature from 550 ℃ to 900 ℃ at a temperature raising rate of 0.7-1.1 ℃/h; finally, the temperature is raised from 900 ℃ to 1400 ℃ at a heating rate of 1.1-1.5 ℃/h.
Further, the preheating temperature in the S7 is 1300 ℃, and the preheating time is 4 h.
Further, in S9, the carbon material coated with the conductive paste is attached to the bracket and fixed by a jig.
Further, the heating curing treatment in S9 specifically includes: putting the metal-impregnated carbon material fixed by the clamp and the bracket into an oven at normal temperature; the temperature of the oven is adjusted to 20-80 ℃ for the first time, and the temperature is kept for 30-70 minutes; adjusting the temperature of the oven to 80-130 ℃ for the second time, and preserving the heat for 20-60 minutes; and regulating the temperature of the oven to 130-150 ℃ for the third time, and keeping the temperature for 180 minutes to integrate the metal impregnated carbon material with the bracket.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of a metal-impregnated current collector material for a subway, which is used for producing a current collector sliding block material, is a novel carbon product, has very good physical and chemical performance indexes, obviously improves the electrical conductivity, the thermal conductivity, the friction, the wearability, the corrosion resistance and the like of the current collector sliding block material due to the addition of a copper material, has short production period, greatly improves the yield of the product, and particularly obtains the subway current collector material meeting the requirements after the carbon material is impregnated with metal. Secondly, preparing the metal impregnated carbon material by using a new technical process, namely putting the sintered carbon material primary blank into a sealed impregnation tank, vacuumizing, injecting high-temperature copper water, and performing pressure impregnation treatment to obtain the metal impregnated carbon material. Thereby increasing the bulk density of the carbon material and improving the mechanical strength, corrosion resistance and oxidation resistance. The volume density of the current collector sliding block for the subway obtained by the invention is less than or equal to 3.2g/cm3The resistivity is less than or equal to 6 mu omega.m, the breaking strength is more than or equal to 70Mpa, the Shore hardness is more than or equal to 70HS, the wear resistance is less than or equal to 15 mm/ten thousand km, and the wear to the wire is less than or equal to 0.015mm2Ten thousand bow stands.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of a metal-impregnated current collector material for a subway comprises the following steps:
s1, aggregate: mixing asphalt coke, calcined petroleum coke, a nano carbon material, special graphite powder and carbon fiber through crushing, grinding, screening and batching to obtain aggregate; the juiceThe true density of the green coke is more than or equal to 2.0g/cm3Ash content is less than 0.5 percent, and volatile matter is less than 0.8 percent; the true density of the calcined petroleum coke is more than or equal to 2.13g/cm3Ash content is less than or equal to 0.20 percent, volatile matter is less than or equal to 0.25 percent, and sulfur content is less than or equal to 0.40 percent. The tensile modulus of the nano carbon material is less than or equal to 1.01TPa, and the ultimate strength is less than or equal to 116 Gpa; the volume density of the special graphite powder is more than or equal to 1.75g/cm3Resistivity is less than or equal to 6.0 mu omega m, breaking strength is more than or equal to 28Mpa, compressive strength is more than or equal to 32Mpa, porosity is less than or equal to 12%, ash content is less than or equal to 0.10%, and thermal expansion coefficient is less than or equal to 2 x 10-6/° c; the volume density of the carbon fiber is more than or equal to 1.85g/cm3(ii) a The particle size of the asphalt coke is more than 0.5 mu m and less than or equal to 2 mu m and is 55-60 percent; 40-45% of the particles with the particle size less than or equal to 0.15 mu m; the nano carbon material has a particle size of 0.3-0.8 μm, a tensile modulus of less than or equal to 1.01TPa and an ultimate strength of less than or equal to 116 Gpa; the particle size of the special graphite powder is 0.5-1 μm; the particle size of the carbon fiber is 0.1-0.5 μm; the crushed grain size range and the content of the calcined petroleum coke are as follows: 0.45 μm<5 to 15wt% of particles with the particle diameter less than or equal to 0.33 mu m; 0.33 μm<15-25 wt% of particles with the particle size of less than or equal to 0.10 mu m; 0.10 μm<25-30 wt% of particles with the particle size of less than or equal to 0.70 mu m; 0<Particle size<The 0.70 mu m is 40-45 wt%; preferably, the crushed particle size range and content of the calcined petroleum coke are as follows by weight percentage: 0.45 μm<5wt% of particle size less than or equal to 0.33 μm; 0.33 μm<15wt% of particles with the particle diameter less than or equal to 0.10 mu m; 0.10 μm<30wt% of particle size less than or equal to 0.70 μm; 0<Particle size<0.70 μm is 40 wt%; the weight ratio of the pitch coke, the carbon fiber, the nano-carbon material, the special graphite powder and the calcined petroleum coke is 15-20: 5-10: 3-5: 15-20: 60 to 65 percent;
s2, dry mixing: putting the S1 into a kneading pot, stirring at the speed of 45r/min for 30-40min, and dry mixing at the temperature of 160 ℃ and 180 ℃;
s3, wet mixing: injecting medium-temperature asphalt serving as a binder into an S2 kneading pot through an asphalt pipeline to be fully and uniformly stirred with the aggregate to obtain a paste; the softening point of the medium-temperature pitch is 83-86 ℃, the coking value is more than or equal to 58%, the ash content is less than or equal to 0.25%, and the quinoline insoluble substance is less than or equal to 0.30%; volume density of molten copper is 8.92g/cm3Melting point 1100 ℃, boiling point 2600 ℃; the weight ratio of the aggregate to the binder is 70-75:25-30, preferably 72: 28; the medium temperature coal tar pitch is heated to 220 ℃ before wet mixing;
s4, granulating: placing the paste obtained in the step S3 in a sheet rolling machine for rolling, and after the rolling and airing, preparing the paste into particles with the particle size of 2mm by a Raymond mill;
s5, extrusion: feeding the particles in S4 into a preheating cylinder of a screw extruder through a pipeline for preheating treatment at the temperature of 180 ℃ at most, and then performing screw extrusion to obtain a green product, wherein the volume density of the green product is more than or equal to 1.77g/cm3；
S6, roasting: carrying out heat treatment on the green product in S5 in an electric furnace in nitrogen atmosphere under the condition of air isolation to obtain a primary roasted product with the required volume density of more than or equal to 1.75g/cm3(ii) a The heat treatment process specifically comprises the following steps: heating the green product from 150 ℃ to 550 ℃ at a heating rate of 1.1-2.1 ℃/h; then raising the temperature from 550 ℃ to 900 ℃ at a temperature raising rate of 0.7-1.1 ℃/h; finally, heating up from 900 ℃ to 1400 ℃ at a heating rate of 1.1-1.5 ℃/h;
s7, dipping: placing the primary roasted product in S6 into a graphite tank for preheating treatment at 1300 ℃ for 4h, placing the product into a sealed impregnation tank, vacuumizing the impregnation tank, injecting high-temperature copper water into the impregnation tank when the vacuum degree is 0.05Mpa, pressurizing the impregnation tank, and performing pressurized impregnation treatment to obtain the metal-impregnated carbon material, wherein the pressure of the pressurized impregnation treatment is 0.5Mpa, the time of the pressurized impregnation treatment is 5-10min, and the weight gain of the primary roasted product is 5-7%;
s8, machining the carbon material impregnated in the S7 into a required shape;
s9, uniformly coating conductive adhesive on the periphery of the processed metal-impregnated carbon material of S8 under a sealed condition, then adhering the metal-impregnated carbon material and a bracket together, fixing the metal-impregnated carbon material and the bracket by using a clamp, carrying out heating and curing treatment, and putting the metal-impregnated carbon material into an oven at normal temperature; the temperature of the oven is adjusted to 20-80 ℃ for the first time, and the temperature is kept for 30-70 minutes; adjusting the temperature of the oven to 80-130 ℃ for the second time, and preserving the heat for 20-60 minutes; and regulating the temperature of the oven to 130-150 ℃ for the third time, and preserving the heat for 180 minutes to combine the metal impregnated carbon material and the bracket into a whole to prepare the metal impregnated current collector material for the subway.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
1. A preparation method of a metal-impregnated current collector material for a subway is characterized by comprising the following steps:
s1, aggregate: mixing asphalt coke, calcined petroleum coke, a nano carbon material, special graphite powder and carbon fiber through crushing, grinding, screening and batching to obtain aggregate;
s2, dry mixing: putting the aggregate in the S1 into a kneading pot, stirring at the speed of 45r/min for 30-40min, and dry mixing at the temperature of 160-180 ℃;
s3, wet mixing: injecting medium-temperature asphalt into a kneading pot in S2 through an asphalt pipeline to be fully and uniformly stirred with aggregate to obtain paste;
s4, granulating: placing the paste obtained in the step S3 in a sheet rolling machine for rolling, and after the rolling and airing, preparing the paste into particles with the particle size of 2mm by a Raymond mill;
s5, extrusion: feeding the particles in the S4 into a preheating cylinder of a screw extruder through a pipeline, carrying out preheating treatment at 180 ℃, and then carrying out screw extrusion to obtain a green product, wherein the volume density of the green product is more than or equal to 1.77g/cm3；
S6, roasting: carrying out heat treatment on the green product in S5 in an electric furnace in nitrogen atmosphere under the condition of air isolation to obtain a primary roasted product with the required volume density of more than or equal to 1.75g/cm3；
S7, dipping: placing the primary roasted product in S6 into a graphite tank for preheating treatment, then placing the graphite tank into a sealed impregnation tank, vacuumizing the impregnation tank, injecting high-temperature copper water into the impregnation tank when the vacuum degree is 0.05Mpa, then pressurizing the impregnation tank, and performing pressurized impregnation treatment to obtain the metal-impregnated carbon material, wherein the pressure of the pressurized impregnation treatment is 0.5Mpa, the time of the pressurized impregnation treatment is 5-10min, and the weight gain of the primary roasted product is 5-7%;
s8, machining the carbon material impregnated in the S7 into a required shape;
and S9, uniformly coating conductive adhesive on the periphery of the processed metal-impregnated carbon material of S8 under a sealed condition, and then carrying out heating and curing treatment to prepare the metal-impregnated current collector material for the subway.
2. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the method comprises the following steps: the true density of the asphalt coke is more than or equal to 2.0g/cm3Ash content is less than 0.5 percent, and volatile matter is less than 0.8 percent; the true density of the calcined petroleum coke is more than or equal to 2.13g/cm3Ash content is less than or equal to 0.20 percent, volatile matter is less than or equal to 0.25 percent, and sulfur content is less than or equal to 0.40 percent.
3. The tensile modulus of the nano carbon material is less than or equal to 1.01TPa, and the ultimate strength is less than or equal to 116 Gpa; the volume density of the special graphite powder is more than or equal to 1.75g/cm3Resistivity is less than or equal to 6.0 mu omega m, breaking strength is more than or equal to 28Mpa, compressive strength is more than or equal to 32Mpa, porosity is less than or equal to 12%, ash content is less than or equal to 0.10%, and thermal expansion coefficient is less than or equal to 2 x 10-6/° c; the volume density of the carbon fiber is more than or equal to 1.85g/cm3(ii) a The softening point of the medium-temperature pitch is 83-86 ℃, the coking value is more than or equal to 58%, the ash content is less than or equal to 0.25%, and the quinoline insoluble substance is less than or equal to 0.30%; volume density of molten copper is 8.92g/cm3Melting point 1100 ℃ and boiling point 2600 ℃.
4. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the method comprises the following steps: the particle size of the asphalt coke is more than 0.5 mu m and less than or equal to 2 mu m and is 55-60 percent; 40-45% of the particles with the particle size less than or equal to 0.15 mu m; the nano carbon material has a particle size of 0.3-0.8 μm, a tensile modulus of less than or equal to 1.01TPa and an ultimate strength of less than or equal to 116 Gpa; the particle size of the special graphite powder is 0.5-1 μm; the particle size of the carbon fiber is 0.1-0.5 μm;
the crushed grain size range and the content of the calcined petroleum coke are as follows:
0.45 mu m < the particle size is less than or equal to 0.33 mu m and 5-15 wt%;
0.33 mu m < 15-25 wt% with the particle size less than or equal to 0.10 mu m;
0.10 mu m < 25-30 wt% with the particle size less than or equal to 0.70 mu m;
0< particle size <0.70 μm 40-45 wt%.
5. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the method comprises the following steps: the weight ratio of the pitch coke, the carbon fiber, the nano-carbon material, the special graphite powder and the calcined petroleum coke is 15-20: 5-10: 3-5: 15-20: 60 to 65 percent; the weight ratio of the aggregate to the medium-temperature asphalt is 70-75: 25-30.
6. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the method comprises the following steps: the medium temperature coal tar pitch was heated to 220 ℃ before wet mixing.
7. The method for preparing the metal-impregnated current collector material for the subway according to claim 1, wherein the heat treatment process in the step S6 is specifically as follows: heating the green product from 150 ℃ to 550 ℃ at a heating rate of 1.1-2.1 ℃/h; then raising the temperature from 550 ℃ to 900 ℃ at a temperature raising rate of 0.7-1.1 ℃/h; finally, the temperature is raised from 900 ℃ to 1400 ℃ at a heating rate of 1.1-1.5 ℃/h.
8. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the method comprises the following steps: the preheating temperature in the S7 is 1300 ℃, and the preheating time is 4 h.
9. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the method comprises the following steps: in S9, the carbon material coated with the conductive paste is attached to the bracket and fixed by a jig.
10. The preparation method of the metal-impregnated current collector material for the subway according to claim 1, wherein the heating curing treatment in the step S9 is specifically as follows: putting the metal-impregnated carbon material fixed by the clamp and the bracket into an oven at normal temperature; the temperature of the oven is adjusted to 20-80 ℃ for the first time, and the temperature is kept for 30-70 minutes; adjusting the temperature of the oven to 80-130 ℃ for the second time, and preserving the heat for 20-60 minutes; and regulating the temperature of the oven to 130-150 ℃ for the third time, and keeping the temperature for 180 minutes to integrate the metal impregnated carbon material with the bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153653.2A CN110981482A (en) | 2019-11-22 | 2019-11-22 | Preparation method of metal-impregnated current collector material for subway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911153653.2A CN110981482A (en) | 2019-11-22 | 2019-11-22 | Preparation method of metal-impregnated current collector material for subway |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114014662A (en) * | 2021-09-28 | 2022-02-08 | 大同新成新材料股份有限公司 | Selenium-graphene composite isostatic pressing graphite material and preparation method thereof |
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| CN106032328A (en) * | 2015-03-18 | 2016-10-19 | 苏州东南电碳科技有限公司 | Material for preparing locomotive traction motor carbon brush |
| CN107903063A (en) * | 2017-11-03 | 2018-04-13 | 大同新成新材料股份有限公司 | The method for preparing subway collector shoe sliding block using graphene metal-impregnated carbon material |
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| EP1477467A1 (en) * | 2003-05-16 | 2004-11-17 | Hitachi Metals, Ltd. | Composite material having high thermal conductivity and low thermal expansion coefficient, and heat-dissipating substrate |
| CN103482979A (en) * | 2013-09-24 | 2014-01-01 | 常州神驰轨道装备有限公司 | Preparing method for collector shoe |
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