CN102856758B - Electric brush for ABS system and preparation method thereof - Google Patents
Electric brush for ABS system and preparation method thereof Download PDFInfo
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- CN102856758B CN102856758B CN201210354133.XA CN201210354133A CN102856758B CN 102856758 B CN102856758 B CN 102856758B CN 201210354133 A CN201210354133 A CN 201210354133A CN 102856758 B CN102856758 B CN 102856758B
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Abstract
An electric brush for ABS (Anti-skid Brake System) comprises a brush body and a lead-out wire, wherein the brush body comprises 46 to 52 parts by weight of superfine electrolytic copper powder, 52 to 46 parts by weight of cementing powder and 2 parts by weight of modifier at; the cementing powder comprises 1.0 to 3.0 parts of high-purity carbon fiber powder, 23 to 27 parts of artificial graphite powder, 25 to 35 parts of high-purity sub-nanometer graphite powder, 18 to 22 parts of crystal graphite powder, 3 to 8 parts of graphitized carbon black powder, 2.5 to 4.5 parts of rare-earth tungsten disulfide composites and 5 to 15 parts of high-temperature resistant phenolic resin; and the modifier comprises 0.20 to 1.30 parts of vulcanization silver powder, 0.20 to 1.5 parts of stibonium powder and 0.5 to 1.5 parts of zinc powder. The chemical stability, the lubricating property, the electrical conductivity, the high-temperature resistance and the abrasion resistance of the electric brush provided by the invention are much better than that of the existing products.
Description
Technical field
The present invention relates to a kind of brush, especially a kind of useful life overlength, particularly stable output power is reliable, is applicable to brush of automobile ABS brake anti-blocking system motor power delivery and preparation method thereof.
Background technology
The safety traffic of automobile brake system and automobile has relation closely.When meeting with emergency, the vehicle that ABS system is not installed has little time that segmentation is slow stops and can only step on to die at once.Due to vehicle spurt inertia, the unsafe condition such as moment may break away, driving trace skew and vehicle body direction are uncontrolled.The invention of ABS anti-lock braking system has improved the safety of automobile under emergency case greatly.It is a kind ofly can effectively prevent that wheel from being caused the out of control safety device of vehicle body by locking.The vehicle of ABS brake anti-blocking system is housed when wheel is about to reach locking critical point, brake can act on 60 to 120 times in one second, was equivalent to ceaselessly brake, loosen, and similar in appearance to " point is stopped " of mechanical automation, moved.Direction out of control and wheel side sliding when this measure can be avoided emergency brake, oversize tyre frictional force, reaches more than 90% braking efficiency simultaneously.Wherein, by brush, bear vehicle wheel rotational speed in ABS brake anti-blocking system and detecting transmission, and carrying out perception wheel movement state by transducer reception electric power signal that brush transmits, the variation of visible brush will directly have influence on ABS brake anti-blocking system function-stable performance.The functional failure of many automobile ABS brake system, has direct relation with brush wherein.The current domestic service-strong like product that there is no.
Summary of the invention
The present invention will solve the problem of above-mentioned prior art, it is a kind of by once molding formed brush that its object is to provide, this brush is used reliably on ABS brake system motor, and high-output power, life-span in useful life are long, is specially adapted to the work characteristics of automobile ABS brake system motor.
The present invention will solve the problem that above-mentioned prior art exists, and provides a kind of uses reliably, and high-output power, life-span in useful life are long, are specially adapted to the brush that automobile ABS brake anti-blocking system motor is used.
The present invention solves the technical scheme that its technical problem adopts: this brush for ABS brake anti-blocking system, comprise brush body, draw wire, brush body comprises ultra-fine electrolytic copper powder, cementing powder, modifier, the weight ratio of ultra-fine electrolytic copper powder, cementing powder, modifier is: 46 parts to 52 parts of ultra-fine electrolytic copper powders, 52 parts to 46 parts, cementing powder, 2 parts of modifier; Cementing powder comprises high-purity carbon fiber powder, graphous graphite powder, high-purity sub-nanometer graphite powder, crystalline graphite powder, Graphon powder, rare earth tungsten disulfide composite material, thermostable phenolic resin, and its weight proportion is as follows:
1.0 parts～3.0 parts of high-purity carbon fiber powders,
23 parts～27 parts of graphous graphite powders,
25 parts～35 parts of high-purity sub-nanometer graphite powders,
18 parts～22 parts, crystalline graphite powder,
3 parts～8 parts, Graphon powder,
2.5 parts～4.5 parts, rare earth tungsten disulfide composite material,
5 parts～15 parts of thermostable phenolic resins;
Described modifier comprises sulfuration silver powder, antimony powder, zinc powder, and its weight proportion is as follows:
0.20 part～1.30 parts, sulfuration silver powder,
0.20 part～1.5 parts of antimony powders,
0.5 part～1.5 parts of zinc powders.
High-purity carbon fiber powder is that phosphorus content is not less than 99.6%, granularity is 350 object carbon fiber powders, and this carbon fiber powder draw ratio is 5.8～6.2; Graphous graphite powder is that phosphorus content is not less than 98%, ash content lower than 1.5%, moisture is lower than 0.5% graphous graphite powder.
High-purity sub-nanometer graphite powder is that phosphorus content is not less than 99.99%, particle diameter is the natural purification graphite powder below 5 μ m; Crystalline graphite powder is that phosphorus content is not less than 99%, granularity is-200 object crystalline graphite powder.
Rare earth tungsten disulfide composite material is the mixture of oxidation persimmon, lanthana or oxidation persimmon lanthana and the material that tungsten disulfide is composited.
Thermostable phenolic resin is that heat resisting temperature reaches the boron modified thermosetting phenolic resin of 560 ℃.
Ultra-fine electrolytic copper powder be adopt that copper content reaches 99.7%, pine dress is than being 0.8-1.15g/cm
3, granularity is the ultra-fine electrolytic copper powder of-300 object.(note: 1. add the mesh that can sign represent leak this order number before order number.Negative number representation can leak the mesh of this order number, and particle size is less than mesh size; And positive number represents to leak the mesh of this order number, particle size is greater than mesh size.2. in the present invention, adopt mesh size contrast to be as the criterion with U.S.'s Taylor standard sieve.）
The preparation method of this brush for ABS brake anti-blocking system, comprises cementing powder preparation section, cementing powder and electrolytic copper powder and modifier mixed processes, compressing operation, sintering circuit, and wherein cementing powder preparation comprises the steps:
1. the contained material of above-mentioned cementing powder is dropped into and in two Z-shaped mixing kettles, close lid and mix 40 minutes, then add the phenol resin solution as the concentration 48.5% of binding agent, 80 ℃ of design temperatures close lid heating to be mixed; When temperature reaches 75 ℃, continue to mix 30 minutes, take the dish out of the pot;
2. on being set in the flaking machine of 50 ℃, roller temperature rolls continuously sheet twice, the thick 1.5mm that is no more than of sheet;
3. after tablet solvent evaporates, on the flour mill that φ 1.0 ㎜ screen clothes are housed, pulverize once, cross respectively 40 orders and 120 mesh sieves, meal regrinding; By thick, fine powder airtight depositing respectively;
4. by meal, than fine powder 2:1, coordinate, form brush and produce cementing powder.
Cementing powder and electrolytic copper powder and modifier mixed processes comprise the steps: ultra-fine electrolytic copper powder, cementing powder, modifier to weigh by weight proportion, add in drum type mixer, mix 90 minutes, and discharging, whole mistake 30 mesh sieves, airtight depositing, makes moulding powder.
Compressing operation is to adopt 25T full-automatic powder pressing machine that the above-mentioned moulding powder one-shot forming making is formed, and is pressed in the lump and draws wire simultaneously; Die mould density is controlled at 2.55g/cm
3～3.15g/cm
3.
Sintering circuit comprises the steps: the good brush green compact of die mould; put into sintering on the continuous meshbeltfurnace with protective atmosphere; 780 ℃～820 ℃ of sintering maximum temperatures, wherein contain hydrogen, nitrogen in protective atmosphere, the volume ratio of described hydrogen and nitrogen is 1: 3.
The ultra-fine electrolytic copper powder adopting in the present invention (high-new powder Co., Ltd produces by Feitian, Suzhou), its copper content reaches 99.7%, pine dress compares is 0.8-1.15g/cm
3the ultra-fine electrolytic copper powder of ,-300 object, adopting this kind of ultra-fine electrolytic copper powder is for reaching under the prerequisite of brush electric conductivity, with the copper powder of weight minimum, obtains maximum volume and is conducive to the raising of anti-wear performance.
The graphous graphite powder adopting in the present invention (being produced by Shenzhen Si Nuo industry development Co., Ltd), its chemical stabilization, have good high temperature resistant, conduct heat, conduction, lubricated and plasticity.
The Graphon powder adopting in the present invention (Tai Zhi carbon element Co., Ltd produces by Shanghai), by forming containing approximately 40% pitch coke and 60% carbon black, broken after mixing, abrasive dust, moulding, roasting, graphitization, abrasive dust (200 order), have the frictional behavior of stabilizer pole.
In the present invention, cementing powder employing thermostable phenolic resin is that heat resisting temperature reaches the boron modification high temperature thermosetting phenolic resin (production of the sky, Bengbu high-temperature resin Materials Co., Ltd) of 560 ℃, after use, can improve the stability of brush in hot environment, make brush there is remarkable resistance to elevated temperatures, guarantee brush electrical signal detection, transmit to be stablized rapidly and carry out; Adopting high-purity carbon fiber powder is in order to improve the resistance to wear of brush; Adopting high-purity sub-nanometer graphite powder is in order also to improve anti-wear performance and the electric conductivity of brush when improving brush greasy property; Adopt rare earth tungsten disulfide composite material to provide material with excellent lubrification and resistance to wear; Adopt the rational proportion combination of high-purity carbon fiber powder, graphous graphite powder, high-purity sub-nanometer graphite powder, crystalline graphite powder and Graphon powder, make cementing powder overall chemical extremely stable, not affected by strong acid-base, there is extremely strong high temperature resistant, heat transfer, conduction and greasy property, can guarantee stability and durability that automobile ABS brake anti-blocking system detects and controls.
In the present invention, adopt modifier sulfuration silver powder, antimony powder and zinc powder as modifier, in the work of ABS brake anti-blocking system, the temperature of whole system can play rises suddenly when high, and adding sulfuration silver powder is in order to make brush also can keep reliable and stable electric conductivity in difference variation huge environment and particularly hot environment; Adding antimony powder and zinc powder is in order further effectively to improve acid-proof alkaline and the anti-wear performance of brush, ensures the stability of input.
The present invention adopts the formulated moulding powder one-shot forming of said method to form; and sintering on the continuous meshbeltfurnace of the protective atmosphere of the hydrogen that to put into containing volume ratio be 1: 3, nitrogen; can make the brush that chemical stability is high, greasy property is strong, electric conductivity is strong, resistance to elevated temperatures is strong and anti-wear performance is high; fully effective guarantee Service Life of Carbon Brush surpasses automobile ABS brake anti-blocking system time limit time between overhauls(TBO), guarantees that automobile ABS brake anti-blocking system normally uses safely.
The effect that the present invention is useful is: chemical stability of the present invention, greasy property, electric conductivity, resistance to elevated temperatures and anti-wear performance are far above existing product, and useful life was up to 1800 hours; Work contact-making surface friction steadily, no-spark, low noise, fully effective guarantee Service Life of Carbon Brush surpasses automobile ABS brake anti-blocking system time limit time between overhauls(TBO), guarantees that automobile ABS brake anti-blocking system normally uses safely.
Embodiment
Below in conjunction with embodiment, the invention will be further described
Embodiment mono-,
This brush for ABS brake anti-blocking system, comprise brush body, draw wire, brush body comprises ultra-fine electrolytic copper powder, cementing powder, modifier, and the weight ratio of ultra-fine electrolytic copper powder, cementing powder, modifier is: 46 parts to 52 parts of ultra-fine electrolytic copper powders, 52 parts to 46 parts, cementing powder, 2 parts of modifier; Cementing powder comprises high-purity carbon fiber powder, graphous graphite powder, high-purity sub-nanometer graphite powder, crystalline graphite powder, Graphon powder, rare earth tungsten disulfide composite material, thermostable phenolic resin, and its weight proportion is as follows:
1.0 parts～3.0 parts of high-purity carbon fiber powders,
23 parts～27 parts of graphous graphite powders,
25 parts～35 parts of high-purity sub-nanometer graphite powders,
18 parts～22 parts, crystalline graphite powder,
3 parts～8 parts, Graphon powder,
2.5 parts～4.5 parts, rare earth tungsten disulfide composite material,
5 parts～15 parts of thermostable phenolic resins;
Described modifier comprises sulfuration silver powder, antimony powder, zinc powder, and its weight proportion is as follows:
0.20 part～1.30 parts, sulfuration silver powder,
0.20 part～1.5 parts of antimony powders,
0.5 part～1.5 parts of zinc powders.
High-purity carbon fiber powder is that phosphorus content is not less than 99.6%, granularity is 350 object carbon fiber powders, and this carbon fiber powder draw ratio is 5.8～6.2; Described graphous graphite powder is that phosphorus content is not less than 98%, ash content lower than 1.5%, moisture is lower than 0.5% graphous graphite powder.
High-purity sub-nanometer graphite powder is that phosphorus content is not less than 99.99%, particle diameter is the natural purification graphite powder below 5 μ m; Described crystalline graphite powder is that phosphorus content is not less than 99%, granularity is-200 object crystalline graphite powder.
Rare earth tungsten disulfide composite material is the mixture of oxidation persimmon, lanthana or oxidation persimmon lanthana and the material that tungsten disulfide is composited.
Thermostable phenolic resin is that heat resisting temperature reaches the boron modified thermosetting phenolic resin of 560 ℃.
The preparation method of this brush for ABS brake anti-blocking system is as follows:
1, cementing powder preparation
1. by above-mentioned weight proportion, take high-purity carbon fiber powder, graphous graphite powder, high-purity sub-nanometer graphite powder, crystalline graphite powder, Graphon powder, rare earth tungsten disulfide composite material, thermostable phenolic resin, each material is dropped in two Z-shaped mixing kettles and closes and cover mixing 40 minutes, then add the phenol resin solution as the concentration 48.5% of bonding agent, 80 ℃ of design temperatures close lid heating to be mixed; When temperature reaches 75 ℃, continue to mix 30 minutes, take the dish out of the pot;
2. on being set in the flaking machine of 50 ℃, roller temperature rolls continuously sheet twice, the thick 1.5mm that is no more than of sheet;
3. after tablet solvent evaporates, on the flour mill that φ 1.0 ㎜ screen clothes are housed, pulverize once, cross respectively 40 orders and 120 mesh sieves, meal (+40 order) regrinding; By thick, fine powder airtight depositing respectively;
4. by meal, than fine powder 2:1, coordinate, form brush and produce cementing powder.
2, copper powder, cementing powder, modifier are mixed with moulding powder
According to the following formulation:
Cementing powder 50%
Copper powder 48%
Modifier 2%
By above-mentioned three components, add in drum type mixer, mix 90 minutes, discharging, whole mistake 30 mesh sieves, airtight depositing, makes moulding powder, standby.
3, moulding
On 25T full-automatic powder pressing machine, carry out, unit pressure, at 275MPa～317 MPa, is pressed into copper braided wire simultaneously, and die mould density is controlled at 2.95 ± 0.05g/cm
3.
4, sintering
By the good brush green compact of die mould, put into sintering on the continuous meshbeltfurnace with protective atmosphere, 780 ℃ ± 5 ℃ of sintering maximum temperatures, wherein contain volume ratio and are hydrogen, the nitrogen of 1: 3 in protective atmosphere.
Final products are used and the results are shown in Table 1, table 2.
Embodiment bis-,
Cementing powder preparation
1, cementing powder and modifier preparation
1. cementing powder preparation technique process is with embodiment mono-.
2. cementing powder each component proportioning is:
1.0 parts of high-purity carbon fiber powders,
23 parts of graphous graphite powders,
25 parts of high-purity sub-nanometer graphite powders,
18 parts, crystalline graphite powder,
3 parts, Graphon powder,
2.5 parts, rare earth tungsten disulfide composite material,
5 parts of thermostable phenolic resins.
3. modifier each component proportioning is:
0.20 part, sulfuration silver powder,
0.20 part of antimony powder,
0.5 part of zinc powder.
2, moulding powder preparation and subsequent technique are with embodiment mono-.
Final products are used and the results are shown in Table 1, table 2.
Embodiment tri-,
Cementing powder preparation
1, cementing powder and modifier preparation
1. cementing powder preparation technique process is with embodiment mono-.
2. cementing powder each component proportioning is:
3.0 parts of high-purity carbon fiber powders,
27 parts of graphous graphite powders,
35 parts of high-purity sub-nanometer graphite powders,
22 parts, crystalline graphite powder,
8 parts, Graphon powder,
4.5 parts, rare earth tungsten disulfide composite material,
15 parts of thermostable phenolic resins.
3. modifier each component proportioning is:
1.30 parts, sulfuration silver powder,
1.5 parts of antimony powders,
1.5 parts of zinc powders.
2, moulding powder preparation and subsequent technique are with embodiment mono-.
Final products are used and the results are shown in Table 1, table 2.
Comparative example,
1, cementing powder and modifier preparation
1. cementing powder preparation technique process is with embodiment mono-.
2. cementing powder each component proportioning is:
0.7 part～1.5 parts of nano silicon oxides,
8.0 parts of sub-Nano graphite powders,
70.5 parts～71.3 parts of crystalline graphite powders,
45 parts of the phenol resin solutions of concentration 45%.
3. without modifier.
The product that implementation method in above-mentioned three is obtained is tested, and according to the project of product instructions for use, carries out, and result is as follows,
Table 1:
Although the present invention is described by reference to preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation in form and details.
Claims (10)
1. the brush for ABS brake anti-blocking system, comprise brush body, draw wire, described brush body comprises ultra-fine electrolytic copper powder, cementing powder, modifier, it is characterized in that: the weight ratio of described ultra-fine electrolytic copper powder, cementing powder, modifier is: 46 parts to 52 parts of ultra-fine electrolytic copper powders, 52 parts to 46 parts, cementing powder, 2 parts of modifier; Described cementing powder comprises high-purity carbon fiber powder, graphous graphite powder, high-purity sub-nanometer graphite powder, crystalline graphite powder, Graphon powder, rare earth tungsten disulfide composite material, thermostable phenolic resin, and its weight proportion is as follows:
1.0 parts～3.0 parts of high-purity carbon fiber powders,
23 parts～27 parts of graphous graphite powders,
25 parts～35 parts of high-purity sub-nanometer graphite powders,
18 parts～22 parts, crystalline graphite powder,
3 parts～8 parts, Graphon powder,
2.5 parts～4.5 parts, rare earth tungsten disulfide composite material,
5 parts～15 parts of thermostable phenolic resins;
Described modifier comprises sulfuration silver powder, antimony powder, zinc powder, and its weight proportion is as follows:
0.20 part～1.30 parts, sulfuration silver powder,
0.20 part～1.5 parts of antimony powders,
0.5 part～1.5 parts of zinc powders.
2. according to claim 1 for the brush of ABS brake anti-blocking system, it is characterized in that: described high-purity carbon fiber powder is that phosphorus content is not less than 99.6%, granularity is 350 object carbon fiber powders, and this carbon fiber powder draw ratio is 5.8～6.2; Described graphous graphite powder is that phosphorus content is not less than 98%, ash content lower than 1.5%, moisture is lower than 0.5% graphous graphite powder.
3. according to claim 1 for the brush of ABS brake anti-blocking system, it is characterized in that: described high-purity sub-nanometer graphite powder is that phosphorus content is not less than 99.99%, particle diameter is the natural purification graphite powder below 5 μ m; Described crystalline graphite powder is that phosphorus content is not less than 99%, granularity is-200 object crystalline graphite powder.
4. according to claim 1 for the brush of ABS brake anti-blocking system, it is characterized in that: described rare earth tungsten disulfide composite material is the mixture of oxidation persimmon, lanthana or oxidation persimmon lanthana and the material that tungsten disulfide is composited.
5. according to claim 1 for the brush of ABS brake anti-blocking system, it is characterized in that: described thermostable phenolic resin is that heat resisting temperature reaches the boron modified thermosetting phenolic resin of 560 ℃.
6. according to claim 1 for the brush of ABS brake anti-blocking system, it is characterized in that: described ultra-fine electrolytic copper powder be adopt that copper content reaches 99.7%, pine dress is than being 0.8-1.15g/cm
3, granularity is the ultra-fine electrolytic copper powder of-300 object.
7. the preparation method of the described brush for ABS brake anti-blocking system of one of claim 1～6, comprise cementing powder preparation section, cementing powder and ultra-fine electrolytic copper powder and modifier mixed processes, compressing operation, sintering circuit, it is characterized in that: described cementing powder preparation comprises the steps:
1. the contained material of above-mentioned cementing powder is dropped into and in two Z-shaped mixing kettles, close lid and mix 40 minutes, then add the phenol resin solution as the concentration 48.5% of binding agent, 80 ℃ of design temperatures close lid heating to be mixed; When temperature reaches 75 ℃, continue to mix 30 minutes, take the dish out of the pot;
2. on being set in the flaking machine of 50 ℃, roller temperature rolls continuously sheet twice, the thick 1.5mm that is no more than of sheet;
3. after tablet solvent evaporates, on the flour mill that φ 1.0 ㎜ screen clothes are housed, pulverize once, cross respectively 40 orders and 120 mesh sieves, meal regrinding; By thick, fine powder airtight depositing respectively;
4. by meal, than fine powder 2:1, coordinate, form brush and produce cementing powder.
8. according to claim 7 for the preparation method of the brush of ABS brake anti-blocking system, it is characterized in that: described cementing powder and ultra-fine electrolytic copper powder and modifier mixed processes comprise the steps: ultra-fine electrolytic copper powder, cementing powder, modifier to weigh by weight proportion, add in drum type mixer, mix 90 minutes, discharging, all cross 30 mesh sieves, airtight depositing, makes moulding powder.
9. according to claim 8 for the preparation method of the brush of ABS brake anti-blocking system, it is characterized in that: described compressing operation is to adopt 25T full-automatic powder pressing machine that the above-mentioned moulding powder one-shot forming making is formed, and is pressed in the lump and draws wire simultaneously; Die mould density is controlled at 2.55g/cm
3～3.15g/cm
3, unit pressure is at 275MPa～317 MPa.
10. according to claim 7 for the preparation method of the brush of ABS brake anti-blocking system; it is characterized in that: described sintering circuit comprises the steps: the good brush green compact of die mould; put into sintering on the continuous meshbeltfurnace with protective atmosphere; 780 ℃～820 ℃ of sintering maximum temperatures; wherein in protective atmosphere, contain hydrogen, nitrogen, the volume ratio of described hydrogen and nitrogen is 1: 3.
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| CN103447532A (en) * | 2013-09-09 | 2013-12-18 | 中南大学 | Electric brush-slip ring system made from graphite-molybdenum disulfide-copper composite material |
| CN104240794B (en) * | 2014-09-11 | 2017-01-18 | 荣成炭谷有限公司 | Metalized carbon conducting material and manufacturing method thereof |
| CN105036747A (en) * | 2015-06-25 | 2015-11-11 | 合肥蓝科新材料有限公司 | Nano-hydroxyapatite-doped high-density motor carbon brush material and preparation method thereof |
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| CN106505397B (en) * | 2015-09-08 | 2019-06-11 | 苏州东南碳制品有限公司 | A kind of preparation method of passenger car start and stop carbon brush used for electric engine |
| CN106505391B (en) * | 2015-09-08 | 2019-06-11 | 苏州东南碳制品有限公司 | A kind of material being used to prepare passenger car start and stop carbon brush used for electric engine |
| CN106505396B (en) * | 2015-09-08 | 2019-06-11 | 苏州东南碳制品有限公司 | A kind of preparation method of passenger car start and stop carbon brush used for electric engine |
| CN106505392B (en) * | 2015-09-08 | 2019-06-11 | 苏州东南碳制品有限公司 | A kind of passenger car start and stop carbon brush used for electric engine |
| CN106654795A (en) * | 2015-11-04 | 2017-05-10 | 苏州东翔碳素有限公司 | Manufacturing method of brush used for dust collector motor |
| CN106654780A (en) * | 2015-11-04 | 2017-05-10 | 苏州东翔碳素有限公司 | Material used to prepare electric brush applied to dust collector motor |
| CN106654781A (en) * | 2015-11-04 | 2017-05-10 | 苏州东翔碳素有限公司 | Electric brush used for dust collector motor |
| CN106207692B (en) * | 2016-07-07 | 2018-11-20 | 合肥学院 | A method of motor brush is prepared using rice husk |
| CN106848792B (en) * | 2016-12-30 | 2019-04-09 | 重庆市河海碳素制品有限公司 | A kind of graphite carbon brush and preparation method thereof |
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