CN110655908A - Preparation method of carbon fiber friction material - Google Patents
Preparation method of carbon fiber friction material Download PDFInfo
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- CN110655908A CN110655908A CN201910964598.9A CN201910964598A CN110655908A CN 110655908 A CN110655908 A CN 110655908A CN 201910964598 A CN201910964598 A CN 201910964598A CN 110655908 A CN110655908 A CN 110655908A
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- 239000002783 friction material Substances 0.000 title claims abstract description 52
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 48
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 48
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000004744 fabric Substances 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 35
- 239000003822 epoxy resin Substances 0.000 claims abstract description 31
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 26
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 11
- 238000009941 weaving Methods 0.000 claims abstract description 10
- 238000009987 spinning Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 239000003085 diluting agent Substances 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 238000003763 carbonization Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010000 carbonizing Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000010425 asbestos Substances 0.000 description 9
- 229910052895 riebeckite Inorganic materials 0.000 description 9
- 239000002994 raw material Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- 238000005470 impregnation Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/149—Antislip compositions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/12—Details not specific to one of the before-mentioned types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a preparation method of a carbon fiber friction material, and belongs to the technical field of friction material preparation. The carbon fiber friction material is obtained by spinning and weaving Polyacrylonitrile (PAN) -based pre-oxidized fibers, carbonizing at high temperature and then impregnating epoxy resin. The good heat conduction, the electric conduction and the uneven surface structure of the conductive carbon fiber cloth are fully utilized, the combination of the conductive carbon fiber material and the epoxy resin is realized, and the friction material with high strength, friction resistance and good heat resistance is formed. Solves the technical problems of high production cost and serious environmental pollution of the friction material in the prior art. Meanwhile, the preparation method provided by the invention is simple in process, can ensure the stable quality of the friction material under the condition of low cost, and is beneficial to industrial popularization.
Description
Technical Field
The invention relates to the technical field of friction material preparation, in particular to a preparation method of a carbon fiber friction material.
Background
Asbestos has high tensile strength, excellent mechanical properties and high temperature resistance, and is inexpensive, and therefore, in the prior art, asbestos is widely used in the fields of building materials, fire-fighting and friction materials, and the like. The friction material is generally prepared by mixing asbestos fiber as a reinforcing material with a certain amount of phenolic resin and a certain amount of barite, feldspar powder and rubber components or other fillers. However, in the manufacturing process, the asbestos fiber generates a large amount of dust, so that the production environment is polluted, and meanwhile, certain harm is caused to the health of operators. In addition, asbestos-based friction materials can cause asbestos dust pollution along with the increase of the friction times in the use process. For the above reasons, asbestos is increasingly prohibited in friction material products.
Against the background described above, semi-metallic friction materials have begun to become popular in western countries, replacing graphite fibers with metal fibers. However, because the formula contains a large amount of metal components, the product has the defects of high hardness, easy duality, easy corrosion and the like, and cannot meet the new technical performance requirements of modern automobile braking systems on friction materials. With the technical progress, the requirement for high-performance friction damping materials in the industry is higher and higher, and a material which is environment-friendly, high in performance and good in reliability is urgently needed to replace asbestos and metal-based friction materials.
In the prior art, patent document CN1670113A discloses an asbestos-free and metal-free friction material for vehicles, which is made of fiber material, ceramic material, adhesive, lubricant and filler; the prior art with publication number CN103001657A provides a copper-free and metal-free environment-friendly ceramic-based friction material, which is manufactured by using ceramic fibers, mineral fibers, organic fibers, graphite, phenolic resin, potassium titanate platelets, metal sulfide compounds, an abrasive enhancer, fillers and other raw materials. Although the prior art does not contain asbestos and metal components, the ceramic fiber friction material adopts ceramic fiber as a main component, belongs to a ceramic-based friction material, and has higher cost and larger brittleness and is easy to damage compared with a semimetal friction material.
Therefore, it is an urgent problem to provide an environmentally friendly, high performance, low cost friction material.
Disclosure of Invention
In view of the above, the invention provides a carbon fiber friction material which takes an environment-friendly material as a raw material and has high heat resistance, friction resistance, electric conductivity and heat conductivity, and a method for preparing the carbon fiber friction material.
In order to achieve the purpose, the invention adopts the following technical scheme:
the preparation method of the carbon fiber friction material is characterized by comprising the following steps of:
(1) weaving: spinning and weaving Polyacrylonitrile (PAN) -based pre-oxidized fiber to obtain pre-oxidized fiber cloth;
(2) high-temperature carbonization: carrying out high-temperature carbonization on the pre-oxidized fiber cloth in an oxygen-isolated environment, and controlling the temperature at 900-1000 ℃ to obtain conductive carbon cloth;
(3) dipping: placing the conductive carbon in a resin solution, soaking for 1-5min, and drying at the temperature of 150-;
(4) and (3) post-treatment: and carrying out hot flat pressing compression on the pre-product to obtain the carbon fiber friction material.
Preferably, the Polyacrylonitrile (PAN) pre-oxidized fiber is 24K or 48K protofilament, the diameter of the protofilament is 10-13um, and the density is 1.2-1.7g/cm3The limiting oxygen index is 32-38.
Preferably, the gram weight of the pre-oxidized fiber cloth in the step (1) is 170-230g/m2The thickness is 0.4-0.8 mm.
The invention limits the type, diameter, density and limiting oxygen index of the pre-oxidized fiber, and can influence the strength of the carbonized carbon fiber. PAN-based pre-oxidized fiber is the type of protofilament with the highest strength at present, and the thicker the diameter and the higher the density, the higher the fiber strength. Meanwhile, the strength gradually decreases after the limiting oxygen index exceeds 42%, and the gram weight and the thickness of the pre-oxidized fiber cloth influence the porosity index. Therefore, the method can ensure that the high-strength carbon fiber is finally obtained by limiting each index of the pre-oxidized fiber.
Preferably, the pre-oxidized fiber cloth in the step (2) is carbonized at high temperature, and the conductive resistance is reduced to 1.3-1.7 omega/10 cm.
The invention selects the basic conductive carbon fiber cloth, the microstructure of the fiber is provided with a plurality of grooves, the macrostructure is provided with a plurality of holes, and the carbon fiber cloth has the physical characteristics of excellent electric conductivity, heat conductivity and high Mohs hardness, so that the carbon fiber cloth can be used as the best frictional damping material carrier, and can be used as the material adapting to different working conditions by mixing the carbon fiber cloth with different resins or other materials.
Preferably, the epoxy resin in the step (3) is a mixture of an epoxy resin adhesive, a diluent and a curing agent, and the mixture is prepared by mixing the following components in proportion: diluent agent: the curing agent was 6:3: 1.
Preferably, the epoxy resin is THX-023 type epoxy resin produced by Germany Hangao company; the diluent is acetone; the curing agent is P2430 epoxy resin produced by Germany Hangao company.
According to the characteristics of manufacturing carbon fiber composite friction materials, proper epoxy resin is required to be selected to wrap and compound the surface of a carbon fiber material so as to improve the strength and the wear resistance of the carbon fiber material, and a diluent and a curing agent are added into the resin so as to improve the flowability of the epoxy resin and improve the curing time.
Preferably, the epoxy resin dried in the step (3) accounts for 50-55% of the weight of the impregnated conductive carbon cloth.
The weight ratio of the epoxy resin defined by the invention is the optimal ratio, so that the product has high friction coefficient and good strength.
Preferably, the compression ratio after the hot flat pressing compression in the step (4) is 75-80%.
According to the technical scheme, compared with the prior art, the raw materials used in the invention can not cause environmental pollution in the using process, can not cause serious damage to human health, and has good environmental protection property. The invention fully utilizes the good heat conduction, electric conduction and uneven surface structure of the conductive carbon fiber cloth to realize the combination of the conductive carbon fiber material and the epoxy resin, thereby forming the friction material with high strength, friction resistance and good heat resistance. The carbon fiber friction material can be prepared into an automobile brake pad by mixing with other metal fillers by utilizing the characteristics under different friction working conditions, and can also be prepared into a wet clutch soaked in oil by using a pure carbon fiber material, and different methods for processing conductive carbon fibers can produce conductive carbon fiber friction materials with different performances. In addition, the preparation method is simple, the raw materials are easy to obtain, large-scale high-efficiency manufacturing can be realized in general equipment under the condition of conductive carbon fiber cloth forming, and meanwhile, the stable quality of the friction material can be ensured on the premise of low production cost, and the method is convenient for industrial popularization and use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart showing a resin impregnation step in example 1 of the present invention;
FIG. 2 is a schematic diagram showing the shape and dimensions of the carbon fiber friction material after being cut and shaped;
FIG. 3 is a drawing showing the application of the carbon fiber friction material in a multi-plate damper.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example 1
The invention discloses a preparation method of a carbon fiber friction material, which comprises the following steps:
1. selecting raw materials:
selecting Zolter or Taili large tow PAN based pre-oxidized filament, using 24K or 48K precursor filament, the diameter of the filament is 10-13um, and the density is 1.4g/cm3And a limiting oxygen index of 35.
2. Spinning woven cloth
The PAN-based pre-oxidized fiber is spun and woven,
a) the spinning specification is defined as small yarn weaving, 20 yarns are combined into 20/2 yarns, and the twist is 300;
b) weaving 20/2 yarns according to the specification of 10 multiplied by 10 threads/cm of warp and weft density to obtain the fabric with the gram weight of 200g/m2The thickness of the cloth is 0.6mm measured by a universal thickness gauge;
c) the width of the woven cloth is 1.6 meters of the width of a standard weaving machine, and the length of the woven cloth is 150 meters.
3. High temperature carbonization
Carbonizing the pre-oxidized fiber cloth to improve the conductivity of the pre-oxidized fiber cloth, carbonizing the pre-oxidized fiber cloth at a high temperature of 950 ℃ in an oxygen-isolated environment, and reducing the resistance of the conductive carbon fiber cloth to 1.7 omega/10 cm (10 cm spacing measurement resistance) with a unit square gram weight of 160g/m2The thickness is 0.6 mm.
4. Blending resin solution
a) THX-023 type epoxy resin produced by German Hangao is selected as an adhesive, acetone is added as a diluent, P2430 type epoxy resin produced by German Hangao is used as a curing agent, and the preparation proportion is as follows: epoxy resin adhesive: diluent agent: curing agent 6:3: 1;
b) after the epoxy resin is mixed into a container according to a proportion, stirring is carried out for 15-25min, and the curing agent, the epoxy resin and the diluent are fully and uniformly mixed for use.
5. Impregnation
On a common general vertical impregnation production line, the impregnation production line is used for carrying out gluing treatment on the conductive carbon cloth (as shown in figure 1), and after the impregnation is finished, the conductive carbon cloth is dried for 15 to 20 minutes in a vertical oven at the temperature of 150-.
6. Hot flat pressing for shaping
Cutting the conductive carbon cloth impregnated with the epoxy resin into a square block with the size of 800 multiplied by 600mm, putting the square block into a standard vulcanizing machine for hot flat pressing, wherein the temperature of a vulcanizing machine template is 180-210 ℃, the flat pressing time is 50-70s, the thickness is flat pressed to 0.5mm, and the compression ratio is 75%, so as to obtain the carbon fiber friction material.
Example 2
The preparation method of the carbon fiber friction material comprises the following steps, which are different from the first embodiment:
(1) in the raw material selection process of the step 1, selecting a pre-oxidized fiber with a limit oxygen index of 38;
(2) step 2, in the spinning and weaving process, the gram weight of the pre-oxidized silk cloth woven in the step b) is 230g/m2The thickness measured by a general thickness gauge is 0.4 mm.
(3) 3, in the high-temperature carbonization process, the pre-oxidized fiber cloth is carbonized at the high temperature of 1000 ℃ in an oxygen-isolated environment, the resistance of the conductive carbon fiber cloth is reduced to 1.3 omega/10 cm, and the unit square gram weight is 150g/m2The thickness is 0.55 mm;
(4) in the process of preparing the epoxy resin in the step 4, a) is carried out, wherein the preparation ratio of the epoxy resin is as follows: epoxy resin adhesive: diluent agent: curing agent 7:2.5: 1;
(5) step 5, in the process of impregnating the epoxy resin, the glue amount of the dried epoxy resin accounts for 55 percent of the weight of the impregnated conductive carbon cloth;
(6) and 5, in the hot flat pressing and shaping process, flatly pressing the thickness of the material to be 0.52mm, wherein the compression ratio is 77%.
Example 3
The preparation method of the carbon fiber friction material comprises the following steps, which are different from the first embodiment:
(1) in the raw material selection process of the step 1, selecting a pre-oxidized fiber with a limit oxygen index of 37;
(2) step 2, in the spinning and weaving process, the gram weight of the pre-oxidized silk woven in the step b) is 170g/m2The thickness measured by a universal thickness gauge is 0.8 mm;
(3) 3, in the high-temperature carbonization process, the pre-oxidized fiber cloth is carbonized at the high temperature of 1000 ℃ in an oxygen-isolated environment, the resistance of the conductive carbon fiber cloth is reduced to 1.5 omega/10 cm, and the unit square gram weight is 155g/m2The thickness is 0.65 mm;
(4) in the process of preparing the epoxy resin in the step 4, a) is carried out, wherein the preparation ratio of the epoxy resin is as follows: epoxy resin adhesive: diluent agent: curing agent 5:3.5: 1;
(5) step 5, in the process of impregnating the epoxy resin, the glue amount of the dried epoxy resin accounts for 53 percent of the weight of the impregnated conductive carbon cloth;
(6) and 5, in the hot flat pressing and shaping process, flatly pressing the thickness of the material to be 0.51mm thick, wherein the compression ratio is 80%.
Example 4
The preparation method of the carbon fiber friction material comprises the following steps, which are different from the first embodiment:
short fibers with the length of 1-5mm of short conductive carbon fibers are used, 3.5% of graphite powder, 34% of diatom powder, 7.5% of copper alloy and 33% of rubber and other fillers are added at the same time, and the short fibers and the copper alloy are mixed and dried with 20% by weight of phenolic resin with the model of PF-906D, heated and pressed into dry friction material blocks, and the dry friction material blocks are applied to riveting or sticking on brake pads to be used as dry friction materials.
Table 1 shows the performance index data of the carbon fiber friction materials obtained in examples 1 to 3 of the present invention.
Table 1: physical mechanical property index data
Example 5
The following will exemplify the use of the carbon fiber friction materials obtained in examples 1 to 3 of the present invention.
The carbon fiber friction materials obtained in the embodiments 1 to 3 of the invention are respectively cut into pieces for application, the conductive carbon cloth damping material after being subjected to hot flat pressing and shaping is cut into the same shape as that shown in figure 2 and assembled into the multi-piece damper shown in figure 3, the rotating motor 1 is connected with the driving shaft 2 to rotate, the pressing force of the pressure spring 4 is adjusted by using the pressure spring screw 3, the dual metal piece 5 is pressed by the pressure spring 4, the dual piece 5 and the friction damping piece 6 are rubbed when the driving motor 1 rotates, a rotating torque is generated, the driving piece 7 and the gear 8 are driven to rotate, and the gear 8 is meshed with the rack 9, so that the rack 9 is driven to move up and down. When the rack 9 meets a certain resistance and the resistance is larger than the friction torque of the multiple dampers, the conductive friction damping sheet 6 and the dual steel sheet 5 slip, thereby playing a role in protecting the motor to limit the torque output. The mechanism is widely applied to automobile window lifters and motor torque-limiting output devices.
The technical effects are as follows:
table 2 shows data of various performance indexes in the application process of example 5 of the present invention.
Table 2: data from constant velocity tests performed according to GB5763-1998
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The preparation method of the carbon fiber friction material is characterized by comprising the following steps of:
(1) weaving: spinning and weaving polyacrylonitrile-based pre-oxidized fibers to obtain pre-oxidized fiber cloth;
(2) high-temperature carbonization: carrying out high-temperature carbonization on the pre-oxidized fiber cloth in an oxygen-isolated environment, and controlling the temperature at 900-1000 ℃ to obtain conductive carbon cloth;
(3) dipping: placing the conductive carbon in a resin solution, soaking for 1-5min, and drying at the temperature of 150-;
(4) and (3) post-treatment: and carrying out hot flat pressing compression on the pre-product to obtain the carbon fiber friction material.
2. The method for preparing the carbon fiber friction material according to claim 1, wherein the polyacrylonitrile-based pre-oxidized filaments in the step (1) are 24K or 48K filaments, the filament diameter of the filaments is 10-13um, and the density is 1.2-1.7g/cm3The limiting oxygen index is 32-38.
3. The method as claimed in claim 2, wherein the pre-oxidized fiber cloth has a grammage of 170-230g/m2The thickness is 0.4-0.8 mm.
4. The method for preparing a carbon fiber friction material as claimed in claim 1, wherein the high temperature carbonization in step (2) is performed to reduce the electrical resistance to 1.3-1.7 Ω/10 cm.
5. The method for preparing the carbon fiber friction material according to claim 1, wherein the resin solution in the step (3) is a mixture of an epoxy resin adhesive, a diluent and a curing agent; the weight ratio of the mixture is that the epoxy resin adhesive: diluent agent: and (5) curing agents, (5-7), (2.5-3.5) and (1).
6. The method for preparing a carbon fiber friction material as claimed in claim 5, wherein the epoxy resin in step (3) is dried to account for 50-55% of the weight of the pre-product.
7. The method for preparing a carbon fiber friction material as claimed in claim 1, wherein the compression ratio after the hot flat pressing compression in the step (4) is 75-80%.
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| JP2002179811A (en) * | 2000-12-08 | 2002-06-26 | Tokai Carbon Co Ltd | Carbonaceous wet friction material |
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