CN113550993B - Reinforced high-speed train brake pad material and preparation method thereof - Google Patents

Reinforced high-speed train brake pad material and preparation method thereof Download PDF

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CN113550993B
CN113550993B CN202110864346.6A CN202110864346A CN113550993B CN 113550993 B CN113550993 B CN 113550993B CN 202110864346 A CN202110864346 A CN 202110864346A CN 113550993 B CN113550993 B CN 113550993B
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powder
brake pad
speed train
moal
train brake
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CN113550993A (en
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叶宏煜
金钟铃
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Wuhan Wan Bang Laser Diamond Tools Co Ltd
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Wuhan Wan Bang Laser Diamond Tools Co Ltd
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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
    • F16D69/027—Compositions based on metals or inorganic oxides
    • 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
    • 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
    • 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
    • F16D2200/0004—Materials; Production methods therefor metallic
    • F16D2200/0008—Ferro
    • 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
    • F16D2200/0004—Materials; Production methods therefor metallic
    • F16D2200/0026—Non-ferro
    • 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
    • F16D2200/0034—Materials; Production methods therefor non-metallic
    • 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
    • F16D2200/0034—Materials; Production methods therefor non-metallic
    • F16D2200/0052—Carbon
    • 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 provides a gainThe reinforced high-speed train brake pad material comprises the following components, by mass, 65% of Cu powder; 8% of Fe powder; 7% of high-carbon ferrochrome powder; MoAl0.97Si0.037% of B powder; 2% of graphite powder; MoS22% of powder; wherein, the particle sizes of the Cu powder, the Fe powder and the high-carbon ferrochrome powder are all less than 85um, and the MoAl0.97Si0.03The granularity range of the B powder is 90-150um, and the MoS2The particle size of the powder and the graphite powder is less than 95 um. The reinforced high-speed train brake pad material provided by the invention is prepared by adding MoAl0.97Si0.03And B, preparing the powder to obtain the high-speed train brake pad with high friction coefficient, stable friction coefficient, low abrasion loss and small damage to a brake disc.

Description

Reinforced high-speed train brake pad material and preparation method thereof
Technical Field
The application relates to the technical field, in particular to a reinforced high-speed train brake pad material and a preparation method thereof.
Background
The brake pad of the high-speed train is a safety component of the high-speed train, the material of the brake pad is required to have a high and stable friction coefficient, and the friction coefficient is not greatly changed along with the running speed, the temperature and the rain and snow environment, so that the material is required to have excellent high-temperature stability and good self-lubricating performance. Copper-based friction materials have irreplaceable advantages in braking. However, as the speed of the train increases, the braking load gradually increases, and the kinetic energy and thermal shock generated during braking also increase greatly. The traditional friction component in the existing brake pad has high hardness and poor plasticity, and has poor wettability with a Cu or Cu alloy substrate, so that the bonding strength between the friction component and the substrate is reduced, the friction component is peeled off under high extrusion pressure, the friction coefficient is reduced, and the brake disc is greatly damaged. In addition, the copper on the friction surface is softened and flows at high temperature, so that the friction coefficient generates larger fluctuation and obvious heat fading in the braking process. Improving the stability of the friction coefficient, reducing the thermal decay of the friction coefficient and better protecting the brake disc are three main aspects of developing high-performance copper-based powder metallurgy brake pads.
MoAl0.97Si0.03B is a material with a laminated structure, has the excellent performances of ceramics and metals, has good heat conduction and electrical conductivity, thermal shock resistance, oxidation resistance and crack self-healing property, and also has excellent wear resistance, self-lubricating property and processability.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present application provide a reinforced brake pad material for a high-speed train and a preparation method thereof.
In a first aspect, the invention provides a reinforced high-speed train brake pad material, which comprises the following components in percentage by mass:
Figure BDA0003187014500000021
wherein, the particle sizes of the Cu powder, the Fe powder and the high-carbon ferrochrome powder are all less than 100um, and the MoAl0.97Si0.03The granularity range of the B powder is 50um-200um, and the MoS2The particle size of the powder and the graphite powder is less than 100 um.
Wherein, copper and iron are used as the constituent elements of the matrix to form a metal matrix with mechanical property; graphite and MoS2As a lubricating component, the lubricating oil plays a role in reducing abrasion; the friction component is high-carbon ferrochrome and is used for improving the friction coefficient; the strengthening component is MoAl0.97Si0.03B, playing a role of solid solution strengthening.
In some embodiments, the composition comprises the following components in percentage by mass:
Figure BDA0003187014500000022
in some embodiments, the composition comprises the following components in percentage by mass:
Figure BDA0003187014500000023
Figure BDA0003187014500000031
in some embodiments, the particle sizes of the Cu powder, the Fe powder and the high-carbon ferrochrome powder are all less than 85um, MoAl0.97Si0.03The granularity of the B powder is 90-150um, MoS2The particle size of the powder and the graphite powder is less than 95 um.
In some embodiments, the purity of the Cu powder, the Fe powder, and the high-carbon ferrochrome powder is not less than 99.0%; MoAl0.97Si0.03The purity of the B powder is not less than 99.0%; the MoS2The purity of the powder and the graphite powder is not less than 99.6%.
In a second aspect, the invention provides a preparation method of a reinforced high-speed train brake pad material, which comprises the following steps:
s1, preparing a mixture according to the components and the mass percentage;
s2, uniformly mixing the mixture by a three-dimensional vortex mixer;
s3, pressing and forming the uniformly mixed mixture;
s4, fixing the pressed compact and the support steel backing, putting the pressed compact and the support steel backing together into a bell jar furnace, and carrying out hot-pressing sintering molding in a reducing gas atmosphere, wherein the sintering temperature range is 750-1000 ℃, and the pressing pressure range is 3-5 MPa.
In some embodiments, in step S3, the pressure value of the press forming is in a range of 400Mpa to 600 Mpa.
In some embodiments, the reducing gas is H2。
In some embodiments, the sintering temperature is 800 ℃ to 950 ℃.
In some embodiments, the holding time for the hot-pressing sintering molding is 1h-3 h.
The invention has the technical effects that:
the reinforced high-speed train brake pad material provided by the invention is prepared by adding MoAl0.97Si0.03The B powder can effectively enhance the strength, wear resistance and impact resistance of the copper matrix material, has small loss of the matrix, can improve the thermal conductivity and machinability, and can prepare the high-speed train brake pad with high friction coefficient, stable friction coefficient, low abrasion loss and small damage to a brake disc.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The parts of the following examples and comparative examples are parts by mass.
Example 1
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent.
1) Weighing the following raw materials: weighing 60% of Cu powder and 60% of Fe powder in percentage by mass: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochrome powder is 99.0 percent, and the granularity is 84 um; MoAl0.97Si0.03The purity of the powder B is 99.0 percent, and the granularity is 90 um; MoS2The purity of the powder and graphite powder was 99.6%, and the particle size was 90 um.
2) Mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And the sintering temperature is 950 ℃, the applied pressure is 3MPa, and the heat preservation time is 1h, so that the reinforced high-speed train brake pad material is obtained.
The density of the brake pad material prepared by the process is 4.915 multiplied by 103kg/m3Average coefficient of friction of 0.425 and volume abrasion of 0.189cm3/MJ。
Example 2
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 70%, Fe powder: 4% and high-carbon ferrochrome powder: 10% of MoAl0.97Si0.03B, powder B: 2% and graphite powder: 10% MoS2Powder: 4%,.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 70%, Fe powder: 4% and high-carbon ferrochrome powder: 10% of MoAl0.97Si0.03B, powder B: 2% and graphite powder: 10% MoS2Powder: 1.5 percent, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochrome powder is 99.3 percent, and the granularity is 80 um; MoAl0.97Si0.03The purity of the powder B is 99.2 percent, and the granularity is 100 um; MoS2The purity of the powder and graphite powder was 99.8%, and the particle size was 93 um.
2) Mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 600 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And sintering at 800 ℃, applying pressure of 5MPa, and keeping the temperature for 3h to obtain the reinforced high-speed train brake pad material.
The density of the brake pad material prepared by the process is 5.345 multiplied by 103kg/m3Average coefficient of friction of 0.416 and volume abrasion of 0.205cm3/MJ。
Example 3
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 63%, Fe powder: 10%, high-carbon ferrochrome powder: 4% of MoAl0.97Si0.03B, powder B: 4%, graphite powder: 7.5% MoS2Powder: 1.5 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 63% of Fe powder: 10%, high-carbon ferrochrome powder: 4%%, MoAl0.97Si0.03B, powder B: 4%, graphite powder: 7.5% MoS2Powder: 1.5 percent, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochrome powder is 99.5 percent, and the granularity is 82.5 um; MoAl0.97Si0.03The purity of the powder B is 99.4 percent, and the granularity is 120 um; MoS2The purity of the powder and graphite powder was 99.7% and the particle size was 91 um.
2) Mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And the sintering temperature is 950 ℃, the applied pressure is 3MPa, and the heat preservation time is 1h, so that the reinforced high-speed train brake pad material is obtained.
The density of the brake pad material prepared by the process is 5.368 multiplied by 103kg/m3Average coefficient of friction of 0.428 and volume abrasion of 0.216cm3/MJ。
Example 4
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 67%, Fe powder: 6% and high-carbon ferrochrome powder: 8% of MoAl0.97Si0.03B, powder B: 4% and graphite powder: 13.5%, MoS2 powder: 1.5 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 67%, Fe powder: 6% and high-carbon ferrochrome powder: 8% of MoAl0.97Si0.03B, powder B: 4% and graphite powder: 13.5% MoS2Powder: 1.5 percent, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochrome powder is 99.6 percent, and the granularity is 79.5 um; MoAl0.97Si0.03The purity of the powder B is 99.6 percent, and the granularity is 130 um; MoS2The purity of the powder and graphite powder was 99.82%, and the particle size was 91 um.
2) Mixing material: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 600 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And sintering at 800 ℃, applying pressure of 5MPa, and keeping the temperature for 3h to obtain the reinforced high-speed train brake pad material.
The density of the brake pad material prepared by the process is 5.438 multiplied by 103kg/m3Average coefficient of friction of 0.430 and volume abrasion of 0.225cm3/MJ。
Example 5
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 65%, Fe powder: 8% and high-carbon ferrochrome powder: 7% of MoAl0.97Si0.03B, powder B: 7%, graphite powder: 11% MoS2Powder: 2 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 65%, Fe powder: 8% and high-carbon ferrochrome powder: 7% of MoAl0.97Si0.03B, powder B: 7%, graphite powder: 11% MoS2Powder: 2 percent, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochrome powder is 99.4 percent, and the granularity is 78 mm; MoAl0.97Si0.03The purity of the powder B is 99.3 percent, and the granularity is 150 um; MoS2The purity of the powder and graphite powder was 99.8%, and the particle size was 90 um.
2) Mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 500 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel back, and placing the pressed compact and the supporting steel back intoHot pressed sintering in bell jar furnace with reducing gas of H2And the sintering temperature is 900 ℃, the applied pressure is 4MPa, and the heat preservation time is 2h, so that the reinforced high-speed train brake pad material is obtained.
The density of the brake pad material prepared by the process is 5.532 multiplied by 103kg/m3Average coefficient of friction of 0.443 and abrasion loss of 0.219cm3/MJ。
Comparative example 1
The material for enhancing the brake pad of the high-speed train is prepared from the following components in percentage by mass: cu powder: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% and graphite powder: 14% MoS2Powder: 4 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 60%, Fe powder: 12 percent of high-carbon ferrochromium powder, 2 percent of graphite powder and 14 percent of MoS24% of powder, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochromium powder is 99.0%, and the granularity is 84 um; MoS2The purity of the powder and graphite powder is 99.6%, and the granularity is 90 um;
2) mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And the sintering temperature is 950 ℃, the applied pressure is 3MPa, and the heat preservation time is 1h, so that the reinforced high-speed train brake pad material is obtained.
The density of the brake pad material prepared by the process is 4.315 multiplied by 103kg/m3Average friction coefficient of 0.312 and volume abrasion loss of 0.324cm3/MJ。
Comparative example 2
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 2% and graphite powder: 14% MoS2Powder: 1 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 2% and graphite powder: 14% MoS2Powder: 1 percent;
2) mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And sintering at 400 ℃, applying pressure of 3MPa, and keeping the temperature for 1h to obtain the reinforced high-speed train brake pad material.
The density of the brake pad material prepared by the process is 4.264 multiplied by 103kg/m3Average coefficient of friction of 0.355 and volume abrasion of 0.289cm3/MJ。
Comparative example 3
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent;
2) mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And sintering at 400 ℃, applying pressure of 1MPa, and keeping the temperature for 1h to obtain the reinforced high-speed train brake pad material.
The density of the brake pad material prepared by the process is 3.265 multiplied by 103kg/m3Average friction coefficient of 0.365 and volume abrasion loss of 0.334cm3/MJ。
Comparative example 4
Preparing MoAl0.97Si0.03B, the material for the reinforced high-speed train brake pad comprises the following components in percentage by mass: cu powder: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent.
1) Weighing the following raw materials: weighing Cu powder according to mass percent: 60%, Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent;
2) mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And sintering at 400 ℃, applying pressure of 3MPa, and keeping the temperature for 0.8h to obtain the reinforced high-speed train brake pad material.
The density of the brake pad material prepared by the process is 3.89 multiplied by 103kg/m3Average friction coefficient of 0.315 and volume abrasion loss of 0.365cm3/MJ。
Comparative example 5
1) Weighing the following raw materials: weighing according to mass percentageTaking 60% of Cu powder and Fe powder: 12%, high-carbon ferrochrome powder: 2% of MoAl0.97Si0.03B, powder B: 8% and graphite powder: 14% MoS2Powder: 4 percent;
2) mixing materials: mixing the prepared raw material powders of Cu powder, Fe powder, high-carbon ferrochromium powder and MoAl0.97Si0.03B powder, graphite powder and MoS2Mixing the powder uniformly by a three-dimensional vortex mixer;
3) compression molding: introducing the uniformly mixed raw material powder into a die for compression molding, wherein the pressure is 400 MPa;
4) hot-pressing and sintering in a reducing atmosphere: fixing the pressed compact and the supporting steel backing, putting the pressed compact and the supporting steel backing into a bell jar furnace for hot-pressing sintering, wherein the reducing gas is H2And the sintering temperature is 600 ℃, the applied pressure is 2MPa, and the heat preservation time is 3h, so that the reinforced high-speed train brake pad material is obtained.
The density of the brake pad material prepared by the process is 4.265 multiplied by 103kg/m3Average friction coefficient of 0.358 and volume abrasion loss of 0.327cm3/MJ。
In conclusion, the density of the brake pad material of the reinforced high-speed train brake pad material prepared by adding MoAl0.97Si0.03B powder is 4.9 multiplied by 103kg/m3Above, the average friction coefficient is more than 0.41, and the abrasion loss is less than 0.23cm3And MJ, preparing the high-speed train brake pad with high friction coefficient, stable friction coefficient, low abrasion loss and small damage to a brake disc.
It should be noted that in the present application, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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 (10)

1. The reinforced high-speed train brake pad material is characterized by comprising the following components in percentage by mass:
Figure FDA0003187014490000011
wherein, the particle sizes of the Cu powder, the Fe powder and the high-carbon ferrochrome powder are all less than 100um, and the MoAl0.97Si0.03The granularity range of the B powder is 50um-200um, and the MoS2The particle size of the powder and the graphite powder is less than 100 um.
2. The reinforced high-speed train brake pad material as claimed in claim 1, which comprises the following components in percentage by mass:
Figure FDA0003187014490000012
3. the reinforced high-speed train brake pad material as claimed in claim 1, which comprises the following components in percentage by mass:
Figure FDA0003187014490000013
Figure FDA0003187014490000021
4. the reinforced high-speed train brake pad material of claim 1, wherein the particle sizes of the Cu powder, the Fe powder and the high-carbon ferrochrome powder are all less than 85um and MoAl0.97Si0.03The granularity of the B powder is 90-150um, MoS2The particle size of the powder and the graphite powder is less than 95 um.
5. The reinforced high-speed train brake pad material as claimed in claim 1, wherein the purity of the Cu powder, the Fe powder and the high-carbon ferrochrome powder is not less than 99.0%; MoAl0.97Si0.03The purity of the B powder is not less than 99.0%; the MoS2The purity of the powder and the graphite powder is not less than 99.6%.
6. A method of preparing the reinforced high speed train brake pad material according to any one of claims 1 to 5, comprising the steps of:
s1, preparing a mixture according to the components and the mass percentage;
s2, uniformly mixing the mixture by a three-dimensional vortex mixer;
s3, pressing and forming the uniformly mixed mixture;
s4, fixing the pressed compact and the support steel backing, putting the pressed compact and the support steel backing into a bell jar furnace, and carrying out hot-pressing sintering molding in a reducing gas atmosphere, wherein the sintering temperature range is 750-1000 ℃, and the pressing pressure range is 3-5 MPa.
7. The method of claim 6, wherein the press-molding is performed at a pressure value ranging from 400Mpa to 600Mpa in step S3.
8. The method according to claim 6, wherein in step S4, the reducing gas is H2。
9. The method of claim 6, wherein the sintering temperature is 800 ℃ to 950 ℃ in step S4.
10. The method of claim 6, wherein in step S4, the heat-pressing sintering molding is carried out for a holding time of 1h-3 h.
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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN109469697A (en) * 2018-12-05 2019-03-15 北京科技大学 The copper-based brake pad of bullet train fiber reinforcement and preparation and friction catch performance
CN109777992A (en) * 2017-11-13 2019-05-21 青岛四通八达商贸有限公司 A kind of copper-based composite friction material of high abrasion and preparation method thereof
CN110238380A (en) * 2019-04-24 2019-09-17 中国科学院山西煤炭化学研究所 A kind of graphene enhancing bullet train brake pad material and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109777992A (en) * 2017-11-13 2019-05-21 青岛四通八达商贸有限公司 A kind of copper-based composite friction material of high abrasion and preparation method thereof
CN109469697A (en) * 2018-12-05 2019-03-15 北京科技大学 The copper-based brake pad of bullet train fiber reinforcement and preparation and friction catch performance
CN110238380A (en) * 2019-04-24 2019-09-17 中国科学院山西煤炭化学研究所 A kind of graphene enhancing bullet train brake pad material and preparation method thereof

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