CN108930736B - Preparation method of ceramic composite fiber brake pad - Google Patents
Preparation method of ceramic composite fiber brake pad Download PDFInfo
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- CN108930736B CN108930736B CN201810846141.3A CN201810846141A CN108930736B CN 108930736 B CN108930736 B CN 108930736B CN 201810846141 A CN201810846141 A CN 201810846141A CN 108930736 B CN108930736 B CN 108930736B
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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
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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
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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
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
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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
- F16D69/028—Compositions based on metals or inorganic oxides containing fibres
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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
- F16D2069/002—Combination of different friction materials
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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
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0026—Non-ferro
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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
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0039—Ceramics
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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
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
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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
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0056—Elastomers
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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
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
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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
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
- F16D2200/0065—Inorganic, e.g. non-asbestos mineral fibres
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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
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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
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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
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0038—Surface treatment
Abstract
The invention relates to the technical field of brake pads, and discloses a preparation method of a ceramic composite fiber brake pad. The brake pad is prepared by uniformly mixing the raw materials, and then sequentially carrying out heating vulcanization, heat treatment and post-treatment. The composite fiber reinforced brake pad has the advantages that the glass fiber, the ceramic fiber and the composite fiber are used for enhancing the framework, the cracking and crazing phenomena in the processing and using processes of the brake pad are reduced, and in addition, the stability of the friction coefficient of the brake pad and the noise reduction effect can be improved through the compounding among the glass fiber, the ceramic fiber and the composite fiber.
Description
Technical Field
The invention relates to the technical field of brake pads, in particular to a preparation method of a ceramic composite fiber brake pad.
Background
With the high-speed increase of the output and sales of China automobiles, the manufacturing level and the technical level of China automobiles are steadily developed and improved. It is also a good opportunity and challenge for automobile parts suppliers with proprietary intellectual property and research and development capabilities. The brake pad is one of the most common parts in an automobile, consists of a steel sheet and a friction base material attached to the steel sheet, and has the working principle that the friction base material generates a friction effect by bearing external pressure, so that the aim of reducing the speed of the automobile is never fulfilled. The brake pad can not contain asbestos component in GB12676-99 'automobile brake system structure and performance test method', the steel fiber is usually used to replace asbestos fiber in the prior art, the semimetal friction material has better friction performance and temperature resistance compared with the asbestos organic friction material at high temperature, but the steel fiber has higher hardness, which can cause larger abrasion and vibration to the mating parts, damage the mating parts, unstable friction coefficient and generate noise during braking.
Disclosure of Invention
The invention provides a preparation method of a ceramic composite fiber brake pad with stable friction coefficient and low noise, aiming at overcoming the problems of unstable friction coefficient and high noise of the brake pad in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: the preparation method of the ceramic composite fiber brake pad is characterized by comprising the following steps of:
1) mixing materials: adding a friction base material raw material of the brake pad into a mixer, wherein the friction base material raw material comprises the following components in parts by weight: 2123, 15-20 parts of resin, 8-12 parts of graphite, 5-10 parts of tire powder, 6-9 parts of barium sulfate, 3-7 parts of modified glass fiber, 5-7 parts of wollastonite, 3-5 parts of ceramic fiber, 12-18 parts of composite fiber and 2-5 parts of rubber powder;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, and then vulcanizing;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
2123 the resin is a thermoplastic phenolic resin which is formed by condensation polymerization of phenol and formaldehyde in an acidic medium, has good thermoplastic performance, gives better toughness to the brake pad, and can reduce noise generated in the friction process of the brake pad; the graphite is an inorganic simple substance with the Mohs hardness of 1, and the wear resistance of the brake pad can be improved by adding the graphite into the brake pad; the ceramic fiber has better heat resistance and thermal stability, and is beneficial to the stability of the abrasion coefficient of the brake pad under the condition of variable temperature; the glass fiber, the ceramic fiber and the composite fiber play a role in reinforcing the framework, so that cracking and crazing phenomena in the processing and using processes of the brake pad are reduced, and in addition, the stability of the friction coefficient of the brake pad and the noise reduction effect can be improved through the compounding among the glass fiber, the ceramic fiber and the composite fiber; the toughness of the brake pad and the thermal stability of the brake pad can be improved by compounding the nitrile powder and the 2123 resin; the rubber powder comprises vulcanized rubber and vulcanized styrene-butadiene rubber, and can further play a role in toughening the friction plate; wollastonite can reinforce the brake pad.
Preferably, the composite fiber consists of mineral fibers and aluminum fibers, and the mass ratio of the mineral fibers to the aluminum fibers is 1: 1-4.
Preferably, the mineral composite fiber has a length of 10 to 20mm and a diameter of 0.1 to 1 mm.
Preferably, the ceramic fiber has a length of 20 to 30mm and a diameter of 1 to 2 mm.
Preferably, the modified glass fiber has a length of 5 to 10mm and a diameter of 0.5 to 1 mm.
Preferably, the preparation method of the modified glass fiber comprises the following steps: adding 1-3 parts by weight of glass fiber and 0.2-0.3 part by weight of silane coupling agent into 90-100 parts by weight of deionized water, stirring for 10-15 min, adding 2-6 parts by weight of polyvinyl alcohol, heating to 70-80 ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, adding 2-3 parts by weight of nano zinc oxide, continuing ultrasonic oscillation for 10-20 min, controlling the ultrasonic oscillation frequency to be 80-100 Hz, and after filtering, putting the glass fiber into a vacuum drying oven to be dried in vacuum for 2-5 h at 50-60 ℃ to obtain the modified glass fiber. The polyvinyl alcohol is subjected to a crosslinking reaction under a heating condition, a polyvinyl alcohol protective film is generated on the surface of the glass fiber, the polyvinyl alcohol protective film can protect a glass fiber material from being damaged in the production process of the product, the original length of the glass fiber is kept as much as possible, the performance of the brake pad is improved, then the nano zinc oxide is deposited on the polyvinyl alcohol film, the surface of the nano zinc oxide has more hydroxyl groups, and a hydrogen bond effect can be generated with the hydroxyl groups on the polyvinyl alcohol, so that nano zinc oxide particles are stably combined with the polyethylene film, the contact area between the glass fiber and the 2123 resin matrix is increased, the strength of combination of the glass fiber and the 2123 resin matrix is favorably improved, and a better anti-cracking effect is.
Preferably, the graphite is subjected to modification treatment, and the modification treatment method comprises the following steps: adding graphite into allyl glycidyl ether, stirring and mixing, filtering, putting ceramic fibers into an oven, drying for 2-5 hours at 40-50 ℃, then adding the ceramic fibers into a polyvinyl alcohol aqueous solution with the mass concentration of 2-5%, wherein the mass ratio of the graphite to the polyvinyl alcohol is 1: 3-6, heating to 40-60 ℃, and reacting for 2-4 hours to obtain the modified graphite. According to the invention, the epoxy group ring opening on the allyl glycidyl ether reacts with the hydroxyl group on the polyvinyl alcohol to generate an oxidation-resistant film on the surface of the graphene, so that the graphene is prevented from being oxidized at a high temperature, the friction performance of the brake pad is reduced, and in addition, the oxidation film can improve the wetting effect of the surface of the graphene, thereby increasing the dispersibility of the graphene in 2123 resin.
Preferably, in the step 1), the rotating speed of a coulter of the mixer is controlled to be 160-220 rmp, the rotating speed of a reamer is controlled to be 1800-2400 rmp, and the mixing time is 2-6 hours.
Preferably, in the hot-pressing treatment process in the step 2), the pressure is controlled to be 20-30 Mpa, and the temperature is controlled to be 100-120 ℃.
Preferably, the heat treatment temperature in the step 3) is 130-160 ℃.
Therefore, the invention has the following beneficial effects: the composite fiber reinforced brake pad has the advantages that the glass fiber, the ceramic fiber and the composite fiber are used for enhancing the framework, the cracking and crazing phenomena in the processing and using processes of the brake pad are reduced, and in addition, the stability of the friction coefficient of the brake pad and the noise reduction effect can be improved through the compounding among the glass fiber, the ceramic fiber and the composite fiber.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the present invention, unless otherwise specified, all the raw materials and equipment used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
A preparation method of a ceramic composite fiber brake pad comprises the following steps:
1) mixing materials: adding a friction base material raw material of the brake pad into a mixer, wherein the friction base material raw material comprises the following components in parts by weight: 2123, 15 parts of resin, 8 parts of graphite, 5 parts of tire powder, 6 parts of barium sulfate, 3 parts of modified glass fiber, 5 parts of wollastonite, 3 parts of ceramic fiber, 12 parts of composite fiber and 2 parts of rubber powder; the rotating speed of a colter of the mixer is controlled at 160rmp, the rotating speed of a reamer is controlled at 1800rmp, and the mixing time is 2 hours;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, controlling the pressure at 20Mpa and the temperature at 100 ℃, and then carrying out vulcanization;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment, wherein the heat treatment temperature is 130 ℃;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
The composite fiber consists of mineral fiber and aluminum fiber, the length of the composite fiber is 10mm, the diameter of the composite fiber is 0.1mm, and the mass ratio of the mineral fiber to the aluminum fiber is 1: 1; the length of the ceramic fiber is 20mm, and the diameter of the ceramic fiber is 1 mm; the modified glass fiber had a length of 5mm and a diameter of 0.5 mm.
The preparation method of the modified glass fiber comprises the following steps: adding 1 weight part of glass fiber and 0.2 weight part of silane coupling agent into 90 weight parts of deionized water, stirring for 10min, then adding 2 weight parts of polyvinyl alcohol, heating to 70 ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, then adding 2 weight parts of nano zinc oxide, continuing the ultrasonic oscillation for 10min, controlling the ultrasonic oscillation frequency at 80Hz, and after filtering, putting the glass fiber into a vacuum drying oven to carry out vacuum drying for 2h at 50 ℃ to obtain the modified glass fiber.
Wherein, the graphite is modified, and the modification method comprises the following steps: adding graphite into allyl glycidyl ether, stirring and mixing, filtering, putting the ceramic fiber into an oven, drying for 2 hours at 40 ℃, then adding the ceramic fiber into a polyvinyl alcohol aqueous solution with the mass concentration of 2%, wherein the mass ratio of the graphite to the polyvinyl alcohol is 1:3, heating to 40 ℃, and reacting for 2 hours to obtain the modified graphite.
Example 2
A preparation method of a ceramic composite fiber brake pad comprises the following steps:
1) mixing materials: adding a friction base material raw material of the brake pad into a mixer, wherein the friction base material raw material comprises the following components in parts by weight: 2123, 16 parts of resin, 9 parts of graphite, 6 parts of tire powder, 7 parts of barium sulfate, 4 parts of modified glass fiber, 5 parts of wollastonite, 3 parts of ceramic fiber, 13 parts of composite fiber and 3 parts of rubber powder; the rotating speed of a colter of the mixer is controlled at 180rmp, the rotating speed of a reamer is controlled at 1900rmp, and the mixing time is 3 hours;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, controlling the pressure at 22Mpa and the temperature at 105 ℃, and then carrying out vulcanization;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment, wherein the heat treatment temperature is 140 ℃;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
The composite fiber consists of mineral fiber and aluminum fiber, the length of the composite fiber is 12mm, the diameter of the composite fiber is 0.3mm, and the mass ratio of the mineral fiber to the aluminum fiber is 1: 2; the length of the ceramic fiber is 22mm, and the diameter of the ceramic fiber is 1 mm; the modified glass fiber had a length of 6mm and a diameter of 0.6 mm.
The preparation method of the modified glass fiber comprises the following steps: adding 1 weight part of glass fiber and 0.2 weight part of silane coupling agent into 92 weight parts of deionized water, stirring for 12min, adding 3 weight parts of polyvinyl alcohol, heating to 74 ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, adding 2 weight parts of nano zinc oxide, continuing ultrasonic oscillation for 15min, controlling the ultrasonic oscillation frequency at 80Hz, and after filtering, putting the glass fiber into a vacuum drying oven to carry out vacuum drying for 3h at 52 ℃ to obtain the modified glass fiber.
Wherein, the graphite is modified, and the modification method comprises the following steps: adding graphite into allyl glycidyl ether, stirring and mixing, filtering, putting the ceramic fiber into an oven, drying for 3 hours at 44 ℃, then adding the ceramic fiber into a polyvinyl alcohol aqueous solution with the mass concentration of 3%, wherein the mass ratio of the graphite to the polyvinyl alcohol is 1:4, heating to 45 ℃, and reacting for 2 hours to obtain the modified graphite.
Example 3
A preparation method of a ceramic composite fiber brake pad comprises the following steps:
1) mixing materials: adding a friction base material raw material of the brake pad into a mixer, wherein the friction base material raw material comprises the following components in parts by weight: 2123, 17 parts of resin, 10 parts of graphite, 7 parts of tire powder, 7.5 parts of barium sulfate, 5 parts of modified glass fiber, 6 parts of wollastonite, 4 parts of ceramic fiber, 15 parts of composite fiber and 3.5 parts of rubber powder; the rotating speed of a coulter of the mixer is controlled at 190rmp, the rotating speed of a reamer is controlled at 2000rmp, and the mixing time is 4 hours;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, controlling the pressure at 25Mpa and the temperature at 110 ℃, and then carrying out vulcanization;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment, wherein the heat treatment temperature is 145 ℃;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
The composite fiber consists of mineral fiber and aluminum fiber, the length of the composite fiber is 15mm, the diameter of the composite fiber is 0.5mm, and the mass ratio of the mineral fiber to the aluminum fiber is 1: 2.5; the length of the ceramic fiber is 26mm, and the diameter of the ceramic fiber is 1.5 mm; the modified glass fiber had a length of 7mm and a diameter of 0.7 mm.
The preparation method of the modified glass fiber comprises the following steps: adding 2 parts by weight of glass fiber and 0.25 part by weight of silane coupling agent into 95 parts by weight of deionized water, stirring for 13min, then adding 4 parts by weight of polyvinyl alcohol, heating to 76 ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, then adding 2.5 parts by weight of nano zinc oxide, continuing the ultrasonic oscillation for 16min, controlling the ultrasonic oscillation frequency at 90Hz, and after filtering, putting the glass fiber into a vacuum drying oven to carry out vacuum drying for 3.5h at 53 ℃ to obtain the modified glass fiber.
Wherein, the graphite is modified, and the modification method comprises the following steps: adding graphite into allyl glycidyl ether, stirring and mixing, filtering, putting the ceramic fiber into an oven, drying for 3.5 hours at 46 ℃, then adding the ceramic fiber into a polyvinyl alcohol aqueous solution with the mass concentration of 3.5%, wherein the mass ratio of the graphite to the polyvinyl alcohol is 1:4.5, heating to 50 ℃, and reacting for 3 hours to obtain the modified graphite.
Example 4
A preparation method of a ceramic composite fiber brake pad comprises the following steps:
1) mixing materials: adding a friction base material raw material of the brake pad into a mixer, wherein the friction base material raw material comprises the following components in parts by weight: 2123, 18 parts of resin, 11 parts of graphite, 8 parts of tire powder, 8 parts of barium sulfate, 6 parts of modified glass fiber, 7 parts of wollastonite, 5 parts of ceramic fiber, 16 parts of composite fiber and 4 parts of rubber powder; the rotating speed of a coulter of the mixer is controlled to be 200rmp, the rotating speed of a reamer is controlled to be 2200rmp, and the mixing time is 5 hours;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, controlling the pressure at 28Mpa and the temperature at 115 ℃, and then carrying out vulcanization;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment, wherein the heat treatment temperature is 150 ℃;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
The composite fiber consists of mineral fiber and aluminum fiber, the length of the composite fiber is 18mm, the diameter of the composite fiber is 0.8mm, and the mass ratio of the mineral fiber to the aluminum fiber is 1: 3; the length of the ceramic fiber is 28mm, and the diameter is 2 mm; the modified glass fiber had a length of 8mm and a diameter of 0.8 mm.
The preparation method of the modified glass fiber comprises the following steps: adding 3 parts by weight of glass fiber and 0.3 part by weight of silane coupling agent into 98 parts by weight of deionized water, stirring for 14min, then adding 5 parts by weight of polyvinyl alcohol, heating to 78 ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, then adding 3 parts by weight of nano zinc oxide, continuing the ultrasonic oscillation for 18min, controlling the ultrasonic oscillation frequency at 100Hz, and after filtering, putting the glass fiber into a vacuum drying oven to carry out vacuum drying for 4h at 54 ℃ to obtain the modified glass fiber.
Wherein, the graphite is modified, and the modification method comprises the following steps: adding graphite into allyl glycidyl ether, stirring and mixing, filtering, putting the ceramic fiber into an oven, drying for 4 hours at 48 ℃, then adding the ceramic fiber into a polyvinyl alcohol aqueous solution with the mass concentration of 4%, wherein the mass ratio of the graphite to the polyvinyl alcohol is 1:5, heating to 55 ℃, and reacting for 4 hours to obtain the modified graphite.
Example 5
A preparation method of a ceramic composite fiber brake pad comprises the following steps:
1) mixing materials: adding a friction base material raw material of the brake pad into a mixer, wherein the friction base material raw material comprises the following components in parts by weight: 2123, 20 parts of resin, 12 parts of graphite, 10 parts of tire powder, 9 parts of barium sulfate, 7 parts of modified glass fiber, 7 parts of wollastonite, 5 parts of ceramic fiber, 18 parts of composite fiber and 5 parts of rubber powder; the rotating speed of a coulter of the mixer is controlled to be 220rmp, the rotating speed of a reamer is controlled to be 2400rmp, and the mixing time is 6 hours;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, controlling the pressure at 30Mpa and the temperature at 120 ℃, and then carrying out vulcanization;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment, wherein the heat treatment temperature is 160 ℃;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
The composite fiber consists of mineral fiber and aluminum fiber, the length of the composite fiber is 20mm, the diameter of the composite fiber is 1mm, and the mass ratio of the mineral fiber to the aluminum fiber is 1: 4; the length of the ceramic fiber is 30mm, and the diameter is 2 mm; the modified glass fiber had a length of 10mm and a diameter of 1 mm.
The preparation method of the modified glass fiber comprises the following steps: adding 3 parts by weight of glass fiber and 0.3 part by weight of silane coupling agent into 100 parts by weight of deionized water, stirring for 15min, then adding 6 parts by weight of polyvinyl alcohol, heating to 80 ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, then adding 3 parts by weight of nano zinc oxide, continuing the ultrasonic oscillation for 20min, controlling the ultrasonic oscillation frequency at 100Hz, and after filtering, putting the glass fiber into a vacuum drying oven to carry out vacuum drying for 5h at 60 ℃ to obtain the modified glass fiber.
Wherein, the graphite is modified, and the modification method comprises the following steps: adding graphite into allyl glycidyl ether, stirring and mixing, filtering, putting the ceramic fiber into an oven, drying for 5 hours at 50 ℃, then adding the ceramic fiber into a polyvinyl alcohol aqueous solution with the mass concentration of 5%, wherein the mass ratio of the graphite to the polyvinyl alcohol is 1:6, heating to 60 ℃, and reacting for 4 hours to obtain the modified graphite.
The friction coefficient and the wear rate of the brake pads of the embodiments 1-5 are tested, and the test results are shown in the following table:
according to the test results, the brake pad has a stable friction coefficient and a low wear rate under the condition of variable temperature.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The preparation method of the ceramic composite fiber brake pad is characterized by comprising the following steps of:
1) mixing materials, namely adding a brake pad friction base material raw material into a mixer, wherein the friction base material raw material comprises the following components, by weight, 15 ~ parts of 2123 resin, 8 ~ parts of graphite, 5 ~ parts of tire powder, 6 ~ parts of barium sulfate, 3 ~ parts of modified glass fiber, 5 ~ parts of wollastonite, 3 ~ parts of ceramic fiber, 12 ~ parts of composite fiber and 2 ~ parts of rubber powder, wherein the preparation method of the modified glass fiber comprises the steps of adding 1 ~ parts of glass fiber and 0.2 ~ 0.3 parts of silane coupling agent into 90 ~ 100 parts of deionized water, stirring for 10 ~ min, adding 2 ~ parts of polyvinyl alcohol, heating to 70 ~ ℃, carrying out ultrasonic oscillation to completely dissolve the polyvinyl alcohol, adding 2.2 parts of nano zinc oxide, continuing to carry out ultrasonic oscillation for 10 ~ min, controlling the ultrasonic oscillation frequency to 80 ~ Hz, filtering, putting the glass fiber into a vacuum drying box, drying the glass fiber at 50 ℃ for ~ hours, and drying the modified glass fiber at 6862 hours to obtain ~ parts of modified glass fiber;
2) heating and vulcanizing: carrying out hot pressing treatment on the mixed material by adopting a high-tonnage hydraulic press, and then vulcanizing;
3) and (3) heat treatment: putting the mixed material obtained by heating and vulcanizing into an oven for heat treatment;
4) and (3) post-treatment: and (3) performing flat chamfering, outer arc roughing, inner arc grinding, drilling and outer arc fine grinding on the mixture obtained after the heat treatment to obtain the brake pad.
2. The method for preparing the ceramic composite fiber brake pad according to claim 1, wherein the composite fiber in the step 1) is composed of mineral fiber and aluminum fiber, and the mass ratio of the mineral fiber to the aluminum fiber is 1:1 ~ 4.
3. The method as claimed in claim 1, wherein the length of the composite fiber of step 1) is 10 ~ 20mm, and the diameter is 0.1 ~ 1 mm.
4. The method for preparing a ceramic composite fiber brake pad according to claim 1, wherein the ceramic fiber in step 1) has a length of 20 ~ 30mm and a diameter of 1 ~ 2 mm.
5. The method for preparing a ceramic composite fiber brake pad according to claim 1, wherein the modified glass fiber in the step 1) has a length of 5 ~ 10mm and a diameter of 0.5 ~ 1 mm.
6. The method of claim 1 ~ 5, wherein the step 1) is carried out by adding graphite into allyl glycidyl ether, stirring and mixing, filtering, drying the ceramic fiber in an oven at 40 ~ 50 ℃ for 2 ~ 5h, adding into 2 ~ 5% polyvinyl alcohol water solution, wherein the mass ratio of graphite to polyvinyl alcohol is 1:3 ~ 6, heating to 40 ~ 60 ℃, and reacting for 2 ~ 4h to obtain the modified graphite.
7. The method as claimed in claim 1 ~ 5, wherein in step 1), the revolution speed of the plow blade of the mixer is controlled at 160 ~ 220rmp, the revolution speed of the reamer is controlled at 1800 ~ 2400rmp, and the mixing time is 2 ~ 6 h.
8. The method of claim 1 ~ 5, wherein the pressure of the heat pressing process in step 2) is controlled at 20 ~ 30MPa and the temperature is controlled at 100 ~ 120 ℃ for the brake pad.
9. The method of claim 1 ~ 5, wherein the heat treatment temperature in step 3) is 130 ~ 160 ℃.
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| JPH0723738B2 (en) * | 1990-07-23 | 1995-03-15 | 日立化成工業株式会社 | Friction material and manufacturing method thereof |
| CN101759862A (en) * | 2009-12-21 | 2010-06-30 | 中国计量学院 | Method for preparing nanoparticle-modified friction material |
| CN101813150B (en) * | 2010-05-20 | 2011-10-05 | 湖南博云汽车制动材料有限公司 | Ceramic fiber reinforced ceramic matrix automotive brake friction material and preparation method thereof |
| CN103320091B (en) * | 2013-05-27 | 2014-05-28 | 湖北飞龙摩擦密封材料股份有限公司 | A friction product |
| CN104356590A (en) * | 2014-10-16 | 2015-02-18 | 湖北飞龙摩擦密封材料股份有限公司 | Silane coupling agent modified friction material and friction plate made of friction material |
| CN106195082B (en) * | 2016-06-28 | 2018-09-28 | 杭州西湖摩擦材料有限公司 | a kind of composite fibre brake block |
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