CN113124076A - Low-resin-based aramid pulp wear-resistant disc brake pad and preparation method thereof - Google Patents

Low-resin-based aramid pulp wear-resistant disc brake pad and preparation method thereof Download PDF

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Publication number
CN113124076A
CN113124076A CN202110426209.4A CN202110426209A CN113124076A CN 113124076 A CN113124076 A CN 113124076A CN 202110426209 A CN202110426209 A CN 202110426209A CN 113124076 A CN113124076 A CN 113124076A
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China
Prior art keywords
brake pad
disc brake
wear
aramid pulp
resin
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Pending
Application number
CN202110426209.4A
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Chinese (zh)
Inventor
孙奇春
周磊
黄显鹏
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Anhui Feiying Auto Parts Co ltd
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Anhui Feiying Auto Parts Co ltd
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Priority to CN202110426209.4A priority Critical patent/CN113124076A/en
Publication of CN113124076A publication Critical patent/CN113124076A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F16D2200/006—Materials; Production methods therefor containing fibres or particles
    • 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 low resin-based aramid pulp wear-resistant disc brake pad and a preparation method thereof, wherein the disc brake pad comprises the following materials in percentage by weight: 6-9% of organic binder, 25-35% of reinforcing material fiber, 10-20% of friction performance regulator, 25-35% of antiwear lubricant, 5-10% of elastic toughening agent, 5-8% of high-temperature inorganic binder, 3-8% of grinding enhancer and 15-30% of space filler; the invention provides a formula research and development of an aramid fiber pulp low-resin-based wear-resistant disc brake pad and a manufacturing technology thereof, wherein aramid fiber pulp hybrid fiber reinforced low-content modified phenolic resin-based brake pad samples are prepared by a mould pressing method. The disc brake pad designed and prepared by the invention has the characteristics of high strength, stable friction coefficient, high temperature resistance, wear resistance and the like, is comfortable to brake in the using process, has no noise and less ash falling, has the service life of more than 10 kilometers, and greatly prolongs the service life of the product.

Description

Low-resin-based aramid pulp wear-resistant disc brake pad and preparation method thereof
Technical Field
The invention relates to the technical field of brake pad manufacturing, in particular to a low-resin-based aramid pulp wear-resistant disc brake pad and a preparation method thereof.
Background
The disc brake pad is a component of a disc brake system, and is a disc pad which is fixed with a tyre of a vehicle and rotates at the same speed, and a caliper are matched to brake the vehicle. It is divided into disc type, ventilated disc type and friction disc type. The disc brake has a disc fixed to the tyre and rotating at the same speed, and during braking, the disc is clamped by oil pressure to generate friction force. The friction block is mainly composed of a friction material and an adhesive, wherein the friction material is an important component in the manufacturing and using processes of the brake pad. The automobile brake pad is a class A key part of an automobile brake system, is established as mandatory product authentication management by the nation in 2020, and the quality of the performance of the automobile brake pad is related to the driving safety and reliability of an automobile. At present, the mainstream automobile disc brake pads in the market all adopt metal or few metal resin-based friction materials, compared with asbestos sheets, the metal fiber reinforced resin-based friction materials are more environment-friendly and stable in friction performance, but the defects that the materials are easy to rust, high in braking noise, easy to damage a dual disc, serious in ash falling and the like exist, and in addition, the matrix adopts pure phenolic resin, so that the problems of large heat fading, poor wear resistance and the like exist at high temperature. Research and use show that a small amount of aramid pulp, composite mineral fiber, ceramic fiber, potassium titanate whisker, pre-oxidized fiber and other hybrid fibers have the characteristics of high use temperature, corrosion resistance, good compatibility with a modified resin matrix, high structural strength, low braking noise, stable friction coefficient, stable and comfortable braking and the like, and can reduce the use amount of the modified resin to a certain extent, greatly improve the heat fading property of the brake pad and reduce the high-temperature abrasion loss of the brake pad to ensure that the brake pad is more wear-resistant.
Disclosure of Invention
Aiming at the defects in the prior art, the aramid pulp hybrid fiber low-content modified phenolic resin-based brake pad sample is prepared by a mould pressing method, the influence of different aramid pulp contents on the friction and wear performance and the main wear mechanism of the low resin-based brake pad is explored, and the formula research and the manufacturing technology of the aramid pulp low-resin-based wear-resistant disc brake pad are researched and provided.
The invention solves the technical problems by the following scheme:
a low resin-based aramid pulp wear-resistant disc brake pad comprises the following materials in percentage by weight: 6-9% of organic binder, 25-35% of reinforcing material fiber, 10-20% of friction performance regulator, 25-35% of antiwear lubricant, 5-10% of elastic toughening agent, 5-8% of high-temperature inorganic binder, 3-8% of grinding enhancer and 15-30% of space filler.
Preferably, the material formula of the organic binder comprises the following components in percentage by weight: 30-50% of butyronitrile modified phenolic resin, 30-50% of cardanol resin and 5-15% of viscosity regulator.
Preferably, the material formula of the reinforcing material fiber comprises the following components in percentage by weight: 30-50% of composite mineral fiber, 20-40% of ceramic fiber, 10-25% of potassium titanate whisker, 5-15% of pre-oxidized fiber and 5-10% of aramid pulp.
Preferably, the friction performance regulator comprises the following materials in percentage by weight: 40-50% of wear-resistant coke powder, 20-30% of red vermiculite and 15-20% of friction powder.
Preferably, the material formula of the antiwear lubricant comprises the following components in percentage by weight: 30-60% of natural crystalline flake graphite, 20-40% of artificial graphite, 10-20% of calcined petroleum coke and 5-15% of carbon black.
Preferably, the elastic toughening agent is nitrile rubber powder.
Preferably, the material formula of the high-temperature inorganic binder comprises the following components in percentage by weight: 50-60% of antimony sulfide and 40-50% of molybdenum disulfide.
Preferably, the grinding aid is zirconium silicate.
Preferably, the space filler is precipitated barium sulfate.
The preparation method of the low resin-based aramid pulp wear-resistant disc brake pad comprises the following preparation steps:
(1) preparing materials: accurately weighing raw materials of each component according to the weight percentage by using a material formula of the disc brake pad for later use;
(2) mixing materials: putting the weighed raw materials of each component into a vertical high-speed mixer, wherein the mixing time is 4-5 min;
(3) molding: weighing the mixture according to the brake pad type number, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 200-300 kgf/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 3-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the brake pad subjected to hot press molding from room temperature to 160-175 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then the disc brake pad prepared by the process is subjected to plane grinding, chamfering, grooving, plastic spraying, marking, processing and packaging according to the technical requirements to obtain the disc brake pad.
The beneficial technical effects which can be realized by the invention at least comprise: the disc brake pad produced by the invention has the characteristics of low consumption of modified phenolic resin, more aramid pulp and other hybrid fibers, high use temperature, corrosion resistance, good compatibility with a modified resin matrix, high structural strength, low braking noise, stable friction coefficient, stable and comfortable braking and the like, and also greatly improves the heat fading property of the brake pad, reduces the high-temperature abrasion loss of the brake pad and ensures that the brake pad is more wear-resistant. The brake is comfortable in the use process, no noise exists, less ash falls, the service life can reach more than 10 kilometers, and the service life of the product is greatly prolonged. The production requirement is met, the large-scale production can be realized, the customer satisfaction is improved, and the application and popularization are good.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific parameters in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A low resin-based aramid pulp wear-resistant disc brake pad comprises the following materials in percentage by weight: 7% of organic binder, 25% of reinforcing material fiber, 10% of friction performance regulator, 25% of antiwear lubricant, 5% of elastic toughening agent, 8% of high-temperature inorganic binder, 3% of grinding enhancer and 17% of space filler.
Further, the material formula of the adhesive comprises the following components in percentage by weight: 50% of butyronitrile modified phenolic resin, 35% of cardanol resin and 15% of viscosity regulator.
Further, the material formula of the reinforced material fiber comprises the following components in percentage by weight: 50% of composite mineral fiber, 20% of ceramic fiber, 10% of potassium titanate whisker, 10% of pre-oxidized fiber and 10% of aramid pulp.
Further, the friction performance regulator comprises the following materials in percentage by weight: 50% of wear-resistant coke powder, 25% of red vermiculite and 25% of friction powder.
Further, the material formula of the anti-wear lubricant comprises the following components in percentage by weight: 40% of natural crystalline flake graphite, 35% of artificial graphite, 20% of calcined petroleum coke and 5% of carbon black.
Further, the material formula of the high-temperature inorganic binder comprises the following components in percentage by weight: 50% of antimony sulfide and 50% of molybdenum disulfide.
Further, the grinding aid is zirconium silicate.
Further, the elastic toughening agent is nitrile rubber powder.
Further, the space filler is precipitated barium sulfate.
A preparation method of a low resin-based aramid pulp wear-resistant disc brake pad comprises the following preparation steps:
(1) preparing materials: accurately weighing raw materials of each component according to the weight percentage by using a material formula of the disc brake pad for later use;
(2) mixing materials: putting the weighed raw materials of each component into a vertical high-speed mixer, wherein the mixing time is 4-5 min;
(3) molding: weighing the mixture according to the brake pad type number, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 250kgf/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 3-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the brake pad subjected to hot press molding from room temperature to 160-175 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then the disc brake pad prepared by the process is subjected to plane grinding, chamfering, grooving, plastic spraying, marking, processing and packaging according to the technical requirements to obtain the disc brake pad.
Example 2
A low resin-based aramid pulp wear-resistant disc brake pad comprises the following materials in percentage by weight: 8% of organic binder, 25% of reinforcing material fiber, 15% of friction performance regulator, 20% of antiwear lubricant, 5% of elastic toughening agent, 6% of high-temperature inorganic binder, 3% of grinding agent and 18% of space filler.
Further, the material formula of the adhesive comprises the following components in percentage by weight: 45% of butyronitrile modified phenolic resin, 45% of cardanol resin and 10% of viscosity regulator.
Further, the material formula of the reinforced material fiber comprises the following components in percentage by weight: 40% of composite mineral fiber, 30% of ceramic fiber, 15% of potassium titanate whisker, 5% of pre-oxidized fiber and 10% of aramid pulp.
Further, the friction performance regulator comprises the following materials in percentage by weight: 45% of wear-resistant coke powder, 25% of red vermiculite and 30% of friction powder.
Further, the material formula of the anti-wear lubricant comprises the following components in percentage by weight: 40% of natural crystalline flake graphite, 30% of artificial graphite, 25% of calcined petroleum coke and 5% of carbon black.
Further, the material formula of the high-temperature inorganic binder comprises the following components in percentage by weight: 60% of antimony sulfide and 40% of molybdenum disulfide.
Further, the grinding aid is zirconium silicate.
Further, the elastic toughening agent is nitrile rubber powder.
Further, the space filler is precipitated barium sulfate.
A preparation method of a low resin-based aramid pulp wear-resistant disc brake pad comprises the following preparation steps:
(1) preparing materials: accurately weighing raw materials of each component according to the weight percentage by using a material formula of the disc brake pad for later use;
(2) mixing materials: putting the weighed raw materials of each component into a vertical high-speed mixer, wherein the mixing time is 4-5 min;
(3) molding: weighing the mixture according to the brake pad type number, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 250kgf/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 3-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the brake pad subjected to hot press molding from room temperature to 160-175 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then the disc brake pad prepared by the process is subjected to plane grinding, chamfering, grooving, plastic spraying, marking, processing and packaging according to the technical requirements to obtain the disc brake pad.
Example 3
A low resin-based aramid pulp wear-resistant disc brake pad comprises the following materials in percentage by weight: 7% of organic binder, 25% of reinforcing material fiber, 15% of friction performance regulator, 25% of antiwear lubricant, 3% of elastic toughening agent, 6% of high-temperature inorganic binder, 3% of grinding additive and 16% of space filler.
Further, the material formula of the adhesive comprises the following components in percentage by weight: 45% of butyronitrile modified phenolic resin, 40% of cardanol resin and 15% of viscosity regulator.
Further, the material formula of the reinforced material fiber comprises the following components in percentage by weight: 35% of composite mineral fiber, 35% of ceramic fiber, 10% of potassium titanate whisker, 5% of pre-oxidized fiber and 15% of aramid pulp.
Further, the friction performance regulator comprises the following materials in percentage by weight: 40% of wear-resistant coke powder, 35% of red vermiculite and 25% of friction powder.
Further, the material formula of the anti-wear lubricant comprises the following components in percentage by weight: 40% of natural crystalline flake graphite, 35% of artificial graphite, 20% of calcined petroleum coke and 5% of carbon black.
Further, the material formula of the high-temperature inorganic binder comprises the following components in percentage by weight: 65% of antimony sulfide and 35% of molybdenum disulfide.
Further, the grinding aid is zirconium silicate.
Further, the elastic toughening agent is nitrile rubber powder.
Further, the space filler is precipitated barium sulfate.
A preparation method of a low resin-based aramid pulp wear-resistant disc brake pad comprises the following preparation steps:
(1) preparing materials: accurately weighing raw materials of each component according to the weight percentage by using a material formula of the disc brake pad for later use;
(2) mixing materials: putting the weighed raw materials of each component into a vertical high-speed mixer, wherein the mixing time is 4-5 min;
(3) molding: weighing the mixture according to the brake pad type number, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 250kgf/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 3-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the brake pad subjected to hot press molding from room temperature to 160-175 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then the disc brake pad prepared by the process is subjected to plane grinding, chamfering, grooving, plastic spraying, marking, processing and packaging according to the technical requirements to obtain the disc brake.
In the invention, the disc brake pad produced by the invention has the characteristics of low consumption of modified phenolic resin, more aramid pulp and other hybrid fibers, high use temperature, corrosion resistance, good compatibility with a modified resin matrix, high structural strength, low braking noise, stable friction coefficient, stable and comfortable braking and the like, and also greatly improves the heat fading property of the brake pad, and reduces the high-temperature abrasion loss of the brake pad to ensure that the brake pad is more wear-resistant. The brake is comfortable in the use process, no noise exists, less ash falls, the service life can reach more than 10 kilometers, and the service life of the product is greatly prolonged. The production requirement is met, the large-scale production can be realized, the customer satisfaction is improved, and the application and popularization are good.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A low resin-based aramid pulp wear-resistant disc brake pad is characterized in that the disc brake pad comprises the following materials in percentage by weight: 6-9% of organic binder, 25-35% of reinforcing material fiber, 10-20% of friction performance regulator, 25-35% of antiwear lubricant, 5-10% of elastic toughening agent, 5-8% of high-temperature inorganic binder, 3-8% of grinding enhancer and 15-30% of space filler.
2. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the material formulation of the organic binder is as follows by weight percent: 30-50% of butyronitrile modified phenolic resin, 30-50% of cardanol resin and 5-15% of viscosity regulator.
3. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the material formulation of the reinforcing material fiber is calculated by weight percent: 30-50% of composite mineral fiber, 20-40% of ceramic fiber, 10-25% of potassium titanate whisker, 5-15% of pre-oxidized fiber and 5-10% of aramid pulp.
4. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the friction performance modifier comprises the following materials in percentage by weight: 40-50% of wear-resistant coke powder, 20-30% of red vermiculite and 15-20% of friction powder.
5. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the wear-resistant lubricant comprises the following materials in percentage by weight: 30-60% of natural crystalline flake graphite, 20-40% of artificial graphite, 10-20% of calcined petroleum coke and 5-15% of carbon black.
6. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the elastic toughening agent is nitrile rubber powder.
7. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the material formulation of the high-temperature inorganic binder is as follows by weight percent: 50-60% of antimony sulfide and 40-50% of molybdenum disulfide.
8. The low resin-based aramid pulp wear-resistant disc brake pad of claim 1, wherein the wear enhancer is zirconium silicate.
9. The low resin based aramid pulp wear-resistant disc brake pad of claim 1, wherein the space filler is precipitated barium sulfate.
10. A method for preparing the low resin-based aramid pulp wear-resistant disc brake pad as claimed in any one of claims 1 to 9, comprising the following preparation steps:
(1) preparing materials: accurately weighing raw materials of each component according to the weight percentage by using a material formula of the disc brake pad for later use;
(2) mixing materials: putting the weighed raw materials of each component into a vertical high-speed mixer, wherein the mixing time is 4-5 min;
(3) molding: weighing the mixture according to the brake pad type number, pouring the mixture into a hot-pressing mold, and setting the hot-pressing pressure to be 200-300 kgf/cm2The hot pressing temperature is 145-155 ℃, gas is exhausted once every 20-30 s of pressing, 3-6 times of gas is exhausted in total, and the pressure maintaining time is 600-900 s;
(4) and (3) heat treatment: heating the brake pad subjected to hot press molding from room temperature to 160-175 ℃ within 4-5 h, preserving heat for 6-8 h, and then stopping heating until the temperature of the oven is cooled to below 50 ℃;
(5) post-processing: and then the disc brake pad prepared by the process is subjected to plane grinding, chamfering, grooving, plastic spraying, marking, processing and packaging according to the technical requirements to obtain the disc brake pad.
CN202110426209.4A 2021-04-20 2021-04-20 Low-resin-based aramid pulp wear-resistant disc brake pad and preparation method thereof Pending CN113124076A (en)

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Application Number Priority Date Filing Date Title
CN202110426209.4A CN113124076A (en) 2021-04-20 2021-04-20 Low-resin-based aramid pulp wear-resistant disc brake pad and preparation method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114151481A (en) * 2021-12-02 2022-03-08 安徽飞鹰汽车零部件股份有限公司 Large flat plate special-shaped friction plate for engineering machinery, preparation method and mold
CN114933776A (en) * 2022-06-06 2022-08-23 安徽飞鹰汽车零部件股份有限公司 Rare earth oxide improved ceramic disc brake pad and preparation method thereof
CN114940615A (en) * 2022-06-06 2022-08-26 安徽飞鹰汽车零部件股份有限公司 Nano modified porous filler disc type brake pad and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114151481A (en) * 2021-12-02 2022-03-08 安徽飞鹰汽车零部件股份有限公司 Large flat plate special-shaped friction plate for engineering machinery, preparation method and mold
CN114151481B (en) * 2021-12-02 2023-06-09 安徽飞鹰汽车零部件股份有限公司 Large-plate special-shaped friction plate for engineering machinery, preparation method and mold
CN114933776A (en) * 2022-06-06 2022-08-23 安徽飞鹰汽车零部件股份有限公司 Rare earth oxide improved ceramic disc brake pad and preparation method thereof
CN114940615A (en) * 2022-06-06 2022-08-26 安徽飞鹰汽车零部件股份有限公司 Nano modified porous filler disc type brake pad and preparation method thereof

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