CN110905954A - Brake shoe material for increasing adhesion coefficient of wheel rail and brake shoe prepared from brake shoe material - Google Patents
Brake shoe material for increasing adhesion coefficient of wheel rail and brake shoe prepared from brake shoe material Download PDFInfo
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- 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—Compositions of linings; Methods of manufacturing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- 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—Compositions of linings; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- 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
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
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- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
Abstract
The invention relates to a brake shoe material for increasing the adhesion coefficient of a wheel rail and a brake shoe prepared from the brake shoe material. Sequentially putting nano-silica modified phenolic resin, butadiene rubber, nano-ceramic particles, talcum powder, serpentine, diatomite and bauxite into a high-speed mixer in proportion for mixing, and finally adding opened carbon fibers and aramid pulp for mixing again to obtain a mixture; placing the tile back and the mixture in a mould for compression molding; and putting the blank after the pressing forming into an oven for curing heat treatment to obtain the brake shoe. Compared with the prior art, the invention adds the nano ceramic material into the formula to prepare the tackified brake shoe, the nano ceramic particles have smaller size and large specific surface area, the brake shoe rubs with the wheel in the braking process of the train, and the ground fine particles are attached on the wheel to form a layer of transfer film, the transfer film is composed of a plurality of micro-convex bodies, and the micro-convex bodies have larger contact area and are adhered on the wheel tread to play a role in tackifying.
Description
Technical Field
The invention relates to the technical field of friction materials, in particular to a brake shoe material for increasing the adhesion coefficient of a wheel rail and a brake shoe prepared from the brake shoe material.
Background
The problem of adhesion between the wheel rails is a very complex problem, and the influence factors are very many. It is related to the state of the rail surface, the speed of the train, the creep rate and other factors. In severe weather such as high humidity, rain and snow, high-density pollutants and the like of a train, or dust, rust, grease and the like exist on the wheel tread, the adhesion coefficient between the wheels and the steel rail is reduced, the wheels are idle and skid, the steel rail or the wheels are scratched, and the wheel turning wheel is caused under severe conditions. In order to ensure the good state of the surface of the wheel rail, prevent the idle running and the skid of the wheel, reduce the wheel turning times, shorten the braking distance and ensure the safe operation of the train, the invention of the brake shoe for tackifying the adhesion coefficient of the wheel rail is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a brake shoe material for increasing the adhesion coefficient of a wheel rail and a brake shoe prepared from the brake shoe material.
The brake shoe is prepared by the brake shoe material for increasing the adhesion coefficient of the wheel rail, the brake shoe has low abrasion rate, the number of turning turns is greatly reduced, the use and maintenance cost is reduced, the wheel tread is not damaged, the heat dissipation performance is good, no metal inlay is needed, and the service life is long.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a brake shoe material for increasing the adhesion coefficient of a wheel rail, which comprises the following components in percentage by weight:
the invention provides a method for preparing a brake shoe by using the brake shoe material, which comprises the following steps:
(1) fiber opening: putting the carbon fiber and aramid fiber pulp into an opener for opening the fibers;
(2) mixing raw materials: sequentially putting nano-silica modified phenolic resin, butadiene rubber, nano-ceramic particles, talcum powder, serpentine, diatomite and bauxite into a high-speed mixer in proportion for mixing, and finally adding opened carbon fibers and aramid pulp for mixing again to obtain a mixture;
(3) hot-press molding: placing the tile back and the mixture in a mould for compression molding;
(4) curing heat treatment: and (4) putting the blank subjected to the press forming in the step (3) into an oven for curing heat treatment to obtain the brake shoe.
In one embodiment of the invention, the time for opening the fibres may be chosen to be 5-8 min.
In one embodiment of the invention, in the raw material mixing process, the nano-silica modified phenolic resin, the butadiene rubber, the nano-ceramic particles, the talcum powder, the serpentine, the diatomite and the bauxite are sequentially put into a high-speed mixer in proportion to be mixed for 15-20min, and finally the opened carbon fibers and the aramid pulp are added and mixed for 5-8 min.
In one embodiment of the invention, in the hot press molding process, the mold temperature is 120-140 ℃, the molding pressure is 15-20MPa, and the pressure is maintained for 20-30 min.
In one embodiment of the present invention, in the curing heat treatment, a temperature-programmed curing heat treatment is performed, in which the temperature rise time per two-zone temperature is 30 min.
In one embodiment of the present invention, in the curing heat treatment, the specific curing temperature and curing time are as follows: the curing time is 4-5h when the curing temperature is 140 ℃, 1-2h when the curing temperature is 150 ℃, 3-5h when the curing temperature is 155 ℃ and 7-8h when the curing temperature is 160 ℃.
In the invention, the nano silica modified phenolic resin can be obtained by adopting the existing technical means, such as the descriptions in patent CN201710127324.5 and patent CN 201510439876.0. The nano silicon dioxide modified phenolic resin plays a role of a binder, the nano silicon dioxide is amorphous white powder, the particle size is small, the specific surface area is large, the surface energy is high, and the modified phenolic resin is adopted, so that the silicon dioxide and macromolecules are combined into a three-dimensional network structure, and the heat resistance, the wear resistance, the strength and the elasticity of the material are improved.
According to the invention, the nano ceramic particles overcome the brittleness of the ceramic material, so that the ceramic has metal-like flexibility and machinability, the strength, toughness and superplasticity of the material are greatly improved, the sintering temperature of the material is obviously reduced, and energy is saved. The nanoparticles have surface effects, small-size effects, macroscopic quantum effects, tunneling effects, and the like, which are not possessed by conventional materials. The smaller the diameter of the nano-particle is, the larger the specific surface area is, and the surface of the nano-particle has high activity, so that a series of special optical, thermal, magnetic and mechanical properties are generated.
Further, the nano ceramic particle material is selected from one or more of nano aluminum oxide, nano silicon carbide, nano silicon dioxide, nano zirconium carbide, nano boron nitride, nano silicon nitride or nano boron carbide.
Nano alumina, α -Al2O3The purity is 99.9%, the grain diameter is 30-40nm, the purity is high, the crystalline phase is stable, the hardness is high, the heat conductivity coefficient is high, and the sintering temperature can be reduced.
The nanometer silicon carbide is β -SiC, has the purity of 99.9 percent, the grain diameter of 30-50nm, has the advantages of wear resistance, high temperature resistance, corrosion resistance, good toughness, excellent grinding performance and excellent electric conduction and heat dissipation performance, and can reduce the sintering temperature due to the high activity of β -SiC, thereby reducing the production cost.
The nano silicon dioxide, commonly called white carbon black, has the particle size of 20-40nm, is spherical in microstructure, has better dispersibility, and can greatly improve the tensile strength, the impact strength, the elongation at break, the thermal stability and the like of the resin.
The nanometer zirconium carbide, ZrC and grey metal powder have small grain size, even distribution, large specific surface area, high surface activity, low apparent density, high temperature resistance, oxidation resistance, high strength, high hardness, good toughness and good thermal conductivity.
The nanometer boron nitride powder is white powder, has the purity of 99.9 percent, the particle size of 30-50nm, large specific surface area, high surface activity, looseness, lubrication, light weight, stable chemical property, low expansion coefficient and good thermal conductivity at high temperature.
The nano silicon nitride is white powder, has the purity of 99.9 percent, the particle size of 20-30nm, small particle size, uniform distribution, large specific surface area, high surface activity, low apparent density, good size stability, high mechanical strength, good chemical corrosion resistance and self-lubricating property.
Nanometer boron carbide, black powder, purity 99.9%, particle size 40-50 nm.
In the invention, the butadiene rubber is a toughening component, the butadiene is polymerized into the synthetic rubber with a regular structure, the cis-structure content of the synthetic rubber is more than 95%, and the performance of the phenolic resin is improved in the friction material, so that the product has high impact strength, stable friction coefficient and good heat fading resistance.
The carbon fiber is a high-strength and high-modulus fiber with the carbon content of more than 95 percent, and has the excellent characteristics of low density, high specific performance, ultrahigh temperature resistance and corrosion resistance.
The carbon fiber is preferably American DuPont carbon fiber with the length of 5-6 mm. When the dosage is too large, the mixture is easy to agglomerate, and the reinforcing effect cannot be ensured when the dosage is small.
The aramid pulp is preferably aramid 1414 pulp. The composite material is light yellow floccule, has high strength, good size stability, no brittleness, high temperature resistance, corrosion resistance, toughness, small shrinkage, good wear resistance and large surface area, can be well combined with other substances, is a reinforcing material, and has the average length of 4-6 mm. The aramid pulp and the carbon fiber are mixed for use, and the function of fiber mixing and reinforcing is achieved.
Talcum powder with a density of 2.6g/cm3White powder, 200-mesh and 300-mesh in particle size, was used as a lubricant.
The antigorite has good performance at low temperature and high temperature, is an excellent friction regulator, and has the effects of enhancing and reducing friction.
The diatomite is used as a filler of the friction material, and can effectively reduce friction noise and heat fading of products.
Bauxite, white powder, 200-350 mesh in particle size.
According to the invention, nano ceramic particles are added in the formula to prepare the tackified brake shoe, the nano ceramic particles have small size and large specific surface area, the particle surface has high activity, and a series of special optical, thermal, magnetic and mechanical properties are generated. In the braking process of a train, a brake shoe rubs with a wheel, and ground fine particles are attached to the wheel to form a layer of transfer film, wherein the transfer film is composed of a plurality of fine micro-protrusions, the micro-protrusions have larger contact areas and are adhered to the tread of the wheel to play a role in tackifying, so that the good state of the surface of a wheel rail is ensured, the wheel is prevented from idling and slipping, the wheel turning times are reduced, the braking distance is shortened, and the safe operation of the train is ensured. The tackified brake shoe can reduce the sintering temperature, save energy and save cost.
The working condition that the wheels run on the track is complex, the wheels roll on the track, and meanwhile, small longitudinal and transverse sliding between the wheel rails occurs, the contact surfaces of the wheel rails are not in a pure static friction state, and the state with micro motion in static is called as an adhesion state. The maximum tangential force between the rails in the adhered state is called the adhesion force, and the ratio of the adhesion force to the vertical load between the rails is called the adhesion coefficient. In practice, the adhesion coefficient is often tested by testing the maximum static friction force instead of the adhesion force for the sake of testing convenience. The material of the wheel is different from that of the track, the adhesion coefficient of the brake shoe is also different, the adhesion coefficient test is carried out on an MM-1000 friction performance tester by testing the static friction coefficient, during the test, the material of the wheel is R9T, and the material of the track is PD 360 kg/m.
The prepared tackified brake shoe passes the adhesion coefficient test, and the adhesion coefficient of the brake shoe is between 0.27 and 0.30 in a dry state; in the wet state, the adhesion coefficient of the brake shoe is between 0.21 and 0.23. The brake shoe material is not added with nano ceramic materials, the rest formula components and the production process are completely the same as those of the brake shoe material for increasing the adhesion coefficient of a wheel rail, the prepared brake shoe is marked as X, the brake shoe is in a dry state, and the adhesion coefficient of the brake shoe is 0.21; in the wet state, the adhesion coefficient of the brake shoe is 0.16. It is seen that the tack coefficient of the tackified shoe is high.
The invention obtains the adhesive brake shoe: the abrasion of the brake shoe is 0.90-1.10 mm/kilometer, and the abrasion of the wheel pair is 0.08-0.10 mm/kilometer. Inlet brake shoe: the abrasion of the brake shoe is 4.50 mm/kilometer, and the abrasion of the wheel set is 0.40 mm/kilometer. The abrasion of the adhesive brake shoe is low, the wheel set abrasion is also low, the wheel can be effectively protected, and the service life of the brake shoe is prolonged.
The invention adds nano ceramic material into the formula to prepare the tackified brake shoe, and the nano ceramic particles have smaller size and large specific surface area. In the braking process of a train, a brake shoe rubs with a wheel, and the ground fine particles are attached to the wheel to form a layer of transfer film, wherein the transfer film is composed of a plurality of micro-convex bodies, and the micro-convex bodies have larger contact areas and are adhered to the tread of the wheel to play a role in tackifying.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the raw materials are scientifically and reasonably selected. According to the nano silicon dioxide modified phenolic resin, as the silicon dioxide and the phenolic resin are combined into a three-dimensional net structure, the heat resistance of the material is improved, and the wear resistance is enhanced. The carbon fiber and the aramid pulp fiber are mixed for use, so that the mixed reinforcing effect is achieved, the material strength is ensured, and the friction and wear performance of the product can be ensured. The butadiene rubber is a toughening component, and the performance of the phenolic resin is improved in the friction material, so that the product has high impact strength, stable friction coefficient and good heat fading resistance. Talcum powder, antigorite, diatomite and bauxite are used as friction performance regulators to regulate the friction performance.
2. The invention adopts nano ceramic particles and combines other raw materials to prepare the tackified brake shoe, the nano ceramic particles have smaller size, large specific surface area and very high activity on the particle surface, the small particles which are ground off by the friction between the brake shoe and a wheel are attached to the surface of the wheel to form a layer of transfer film in the braking process of a train, the transfer film is composed of a plurality of small micro-convex bodies, the micro-convex bodies have larger contact area and are adhered to the wheel tread to play a role in tackification. The prepared tackified brake shoe has high adhesion coefficient, ensures the good state of the surface of a wheel rail, prevents the idle running and the slipping of wheels, reduces the wheel turning times, shortens the braking distance and ensures the safe operation of trains.
3. According to the invention, by optimizing the formula and adopting the nano ceramic particles, the tackifying brake shoe is prepared, the curing heat treatment temperature is lower, the energy is saved, and the cost is saved. The nano ceramic particles have small size, high activity and excellent heat conduction and heat dissipation performance, can transfer heat generated by friction, improve heat fading, stabilize high-temperature friction coefficient, reduce tread temperature and reduce damage to wheels. The abrasion of the adhesive brake shoe is low, the wheel set abrasion is also low, the wheel can be effectively protected, and the service life of the brake shoe is prolonged.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
A brake shoe for increasing the adhesion coefficient of a wheel rail comprises the following components in percentage by weight:
(1) the preparation of the raw materials comprises the following components in percentage by weight:
(2) the preparation method comprises the following steps:
fiber opening: and (3) putting the carbon fiber and aramid fiber pulp into an opener for opening the fibers for 5 min.
Mixing raw materials: putting the raw materials into a high-speed mixer in a proportion sequence, mixing for 15min, finally adding opened fibers, and mixing for 5min to obtain a mixture;
hot-press molding: and (3) putting the tile back and the mixture into a grinding tool for compression molding, wherein the mold temperature is 120 ℃, the molding pressure is 15MPa, and the pressure is maintained for 20 min.
Curing heat treatment: heating and curing in an oven, and performing programmed heating and curing heat treatment, wherein the heating time of every two intervals is 30 min.
The specific curing temperature and curing time are as follows: the curing time is 4h when the curing temperature is 140 ℃, 2h when the curing temperature is 150 ℃, 3h when the curing temperature is 155 ℃ and 8h when the curing temperature is 160 ℃.
In the embodiment, the nano ceramic particle material is selected from nano aluminum oxide and nano boron carbide with the mass ratio of 1: 1.
The brake shoe obtained in example 1 had a coefficient of adhesion of 0.27 in a dry state; in a wet state, the adhesion coefficient of the brake shoe is 0.21, the brake shoe abrasion is 1.10 mm/kilometer, and the wheel pair abrasion is 0.08 mm/kilometer.
Example 2
A brake shoe for increasing the adhesion coefficient of a wheel rail comprises the following components in percentage by weight:
(1) the preparation of the raw materials comprises the following components in percentage by weight:
(2) the preparation method comprises the following steps:
fiber opening: and (3) putting the carbon fiber and aramid fiber pulp into an opener for opening the fibers for 6 min.
Mixing raw materials: the raw materials are sequentially put into a high-speed mixer in proportion to be mixed for 18min, and finally, the opened fibers are added and mixed for 6min to obtain a mixture.
Hot-press molding: and (3) placing the tile back and the mixture in a grinding tool for compression molding, wherein the mold temperature is 130 ℃, the molding pressure is 17MPa, and the pressure is maintained for 25 min.
Curing heat treatment: heating and curing in an oven, and performing programmed heating and curing heat treatment, wherein the heating time of every two intervals is 30 min.
The specific curing temperature and curing time are as follows: the curing time is 4.5h when the curing temperature is 140 ℃, 1.5h when the curing temperature is 150 ℃, 3.5h when the curing temperature is 155 ℃ and 7.5h when the curing temperature is 160 ℃.
In this embodiment, the nano ceramic particle material is selected from nano silicon carbide and nano zirconium carbide with a mass ratio of 1: 1.
The brake shoe obtained in example 2 had a coefficient of adhesion of 0.28 in the dry state; in a wet state, the adhesion coefficient of the brake shoe is 0.23, the brake shoe abrasion is 0.9 mm/kilometer, and the wheel pair abrasion is 0.09 mm/kilometer.
Example 3
A brake shoe for increasing the adhesion coefficient of a wheel rail comprises the following components in percentage by weight:
(1) the preparation of the raw materials comprises the following components in percentage by weight:
(2) the preparation method comprises the following steps:
fiber opening: and (3) putting the carbon fiber and aramid fiber pulp into an opener for opening the fibers for 7 min.
Mixing raw materials: and (3) putting the raw materials into a high-speed mixer in a proportion sequence, mixing for 20min, finally adding the opened fibers, and mixing for 7min to obtain a mixture.
Hot-press molding: and (3) placing the tile back and the mixture into a grinding tool for compression molding, wherein the mold temperature is 135 ℃, the molding pressure is 20MPa, and the pressure is maintained for 28 min.
Curing heat treatment: heating and curing in an oven, and performing programmed heating and curing heat treatment, wherein the heating time of every two intervals is 30 min.
The specific curing temperature and curing time are as follows: the curing time is 4h when the curing temperature is 140 ℃, 1h when the curing temperature is 150 ℃, 4h when the curing temperature is 155 ℃ and 8h when the curing temperature is 160 ℃.
In this embodiment, the nano ceramic particle material is selected from nano boron nitride and nano silicon dioxide with a mass ratio of 1: 1.
The brake shoe obtained in example 3 had a coefficient of adhesion of 0.30 in a dry state; in a wet state, the adhesion coefficient of the brake shoe is 0.22, the brake shoe abrasion is 1.00 mm/kilometer, and the wheel pair abrasion is 0.10 mm/kilometer.
Example 4
A brake shoe for increasing the adhesion coefficient of a wheel rail comprises the following components in percentage by weight:
(1) the preparation of the raw materials comprises the following components in percentage by weight:
(2) the preparation method comprises the following steps:
fiber opening: and (3) putting the carbon fiber and aramid fiber pulp into an opener for opening the fibers for 8 min.
Mixing raw materials: putting the raw materials into a high-speed mixer in a proportion order, mixing for 16min, finally adding opened fibers, and mixing for 8min to obtain a mixture;
hot-press molding: and (3) placing the tile back and the mixture into a grinding tool for compression molding, wherein the mold temperature is 140 ℃, the molding pressure is 18MPa, and the pressure is maintained for 30 min.
Curing heat treatment: heating and curing in an oven, and performing programmed heating and curing heat treatment, wherein the heating time of every two intervals is 30 min.
The specific curing temperature and curing time are as follows: the curing time is 5h when the curing temperature is 140 ℃, 2h when the curing temperature is 150 ℃, 5h when the curing temperature is 155 ℃ and 7h when the curing temperature is 160 ℃.
The nano ceramic particle material in the embodiment is selected from nano silicon nitride.
The brake shoe obtained in example 4 had a coefficient of adhesion of 0.29 in the dry state; in a wet state, the adhesion coefficient of the brake shoe is 0.22, the brake shoe abrasion is 0.95 mm/kilometer, and the wheel pair abrasion is 0.10 mm/kilometer.
Comparative example 1
The composition and the production process of the rest formula are completely the same as those of the example 1 without adding the nano ceramic material, the prepared brake shoe is marked as X, the brake shoe is in a dry state, and the adhesion coefficient of the brake shoe is 0.21; in the wet state, the adhesion coefficient of the brake shoe is 0.16. It is seen that the tack coefficient of the tackified shoe is high.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A brake shoe material for increasing the adhesion coefficient of a wheel rail is characterized by comprising the following components in percentage by weight:
2. a method of making a brake shoe using the brake shoe material of claim 1, comprising the steps of:
(1) fiber opening: putting the carbon fiber and aramid fiber pulp into an opener for opening the fibers;
(2) mixing raw materials: sequentially putting nano-silica modified phenolic resin, butadiene rubber, nano-ceramic particles, talcum powder, serpentine, diatomite and bauxite into a high-speed mixer in proportion for mixing, and finally adding opened carbon fibers and aramid pulp for mixing again to obtain a mixture;
(3) hot-press molding: placing the tile back and the mixture in a mould for compression molding;
(4) curing heat treatment: and (4) putting the blank subjected to the press forming in the step (3) into an oven for curing heat treatment to obtain the brake shoe.
3. The method according to claim 2, characterized in that the time for opening the fibres is 5-8 min.
4. The method of claim 2, wherein during the raw material mixing process, the nano-silica modified phenolic resin, the butadiene rubber, the nano-ceramic particles, the talcum powder, the serpentine, the diatomite and the bauxite are sequentially put into a high-speed mixer in proportion and mixed for 15-20min, and finally the opened carbon fibers and the aramid pulp are added and mixed for 5-8 min.
5. The method of claim 2, wherein the mold temperature is 120 ℃ and the molding pressure is 15-20MPa, and the pressure is maintained for 20-30min during the hot press molding process.
6. The method according to claim 2, wherein in the curing heat treatment, a temperature-programmed curing heat treatment is performed, wherein the temperature rise time for every two intervals is 30 min.
7. The method according to claim 6, wherein the curing heat treatment comprises the following specific curing temperatures and curing times: the curing time is 4-5h when the curing temperature is 140 ℃, 1-2h when the curing temperature is 150 ℃, 3-5h when the curing temperature is 155 ℃ and 7-8h when the curing temperature is 160 ℃.
8. A brake shoe made by the method of any one of claims 2 to 7.
9. The brake shoe of claim 8 wherein the coefficient of adhesion of the brake shoe in the dry state is between 0.27 and 0.30; the coefficient of adhesion in the wet state is between 0.21 and 0.23.
10. The brake shoe of claim 8 wherein said brake shoe wear is 0.90-1.10 mm/kilo-kilometer and wheel-set wear is 0.08-0.10 mm/kilo-kilometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911206838.5A CN110905954B (en) | 2019-11-29 | 2019-11-29 | Brake shoe material for increasing adhesion coefficient of wheel rail and brake shoe prepared from brake shoe material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US6677041B1 (en) * | 1999-03-16 | 2004-01-13 | Otsuka Chemical Co., Ltd. | Platy potassium titanate, process for producing the same, and friction material |
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| CN105001471A (en) * | 2015-05-29 | 2015-10-28 | 河北辛集腾跃实业有限公司 | High-friction coefficient composition brake shoe and production method thereof |
| CN106366366A (en) * | 2016-08-31 | 2017-02-01 | 沈阳远程摩擦密封材料有限公司 | Composite brake lining for braking high speed railway with speed of 300 km/h |
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| CN1294621A (en) * | 1999-02-19 | 2001-05-09 | 大塚化学株式会社 | Friction piece |
| US6677041B1 (en) * | 1999-03-16 | 2004-01-13 | Otsuka Chemical Co., Ltd. | Platy potassium titanate, process for producing the same, and friction material |
| CN1405044A (en) * | 2001-08-10 | 2003-03-26 | 张定权 | High abrasion synthesized brake-shoe for subway trains and production method thereof |
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| CN110905954B (en) | 2021-06-18 |
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