1902results about "Friction lining" patented technology

Systems and methods for forming an oxidation protection system on a composite structure are provided. In various embodiments, the oxidation protection system comprises a boron-glass layer formed on the composite substrate and a silicon-glass layer formed over the boron-glass layer. Each of the boron-glass layer and the silicon-glass layer include a glass former and a glass modifier. The boron-glass layer includes a boron compound comprising a mixture of boron carbide (B4C) powder and cubic boron nitride (BN) powder.

The invention relates to the field of friction materials, and discloses a friction material with a stable friction coefficient for an electromagnetic brake and a preparation method of the friction material. An adhesive comprises polysiloxane modified phenolic resin, benzoxazine and butyronitrile rubber powder; the reinforcing material comprises 1414 para-aramid pulp, calcium sulfate whiskers, composite mineral fibers, copper fibers and modified needle-like wollastonite; the friction increasing material comprises macroporous shell activated carbon, friction particles, garnet powder, barite and nano hafnium nitride; the antifriction material comprises graphite fluoride, nylon and composite modified hydroxyl silicate; the composite modified hydroxyl silicate is obtained by modifying hydroxyl silicate with diisocyanate and stearic acid and then compounding silane modified micro-nano calcium carbonate. The friction material provided by the invention is used for improving the braking stability of an electromagnetic brake and reducing equipment vibration.

The invention relates to a component of a brake for a vehicle, comprising a metal main body having a surface (5a, 5b) that is provided with a coating (B) for increasing the wear resistance thereof, said coating comprising an intermediate layer (Z) deposited on the main body (2) and a cover layer (D) deposited on the intermediate layer (Z), the cover layer (D) being formed from a stainless steel matrix (E) having hard material particles (HP) embedded therein. In order to furthermore confer optimized use properties to such a component, the invention proposes that the hard material particles (HP) embedded into the stainless steel matrix (E) of the cover layer (D) have an average particle diameter of 10 µm to 125 µm and that the hard material particles (HP) have a non-molten core region (K) which is composed of uninfluenced material of the hard material particles (HP), said core region being surrounded at least in sections by a mixing zone (M) formed by material of the stainless steel matrix (E) and material of the respective hard material particle (HP), by means of which the hard material particles (HP) are in each case connected to the stainless steel matrix (E) in an integrally bonded manner. The invention also proposes a method, by which such a coated component can be produced.

The invention relates to the field of friction materials, and discloses a high-reliability friction material for an electromagnetic brake and a preparation method of the high-reliability friction material. Raw materials of the friction material comprise benzoxazine, phenolic resin, butyronitrile rubber powder, modified basalt fibers, PBO pulp, ceramic fibers, plant fibers, carbon fiber powder, potassium titanate lamellar crystals, barite, light calcium carbonate, friction particles, wollastonite powder, aluminum-titanium powder, feldspar powder, aluminum oxide, zircon powder, garnet powder, crystalline flake graphite, artificial graphite, flexible graphite and composite metal sulfide. And polymer lubricating material micro powder. The friction material provided by the invention is suitable for a high-temperature and high-humidity environment, the stability of the braking performance of a brake is improved, and the phenomenon that the brake slips due to attenuation of braking torque is reduced.

The invention belongs to the technical field of application of brake materials for brake pads, and particularly discloses a friction material for a phase change heat storage composite brake pad, which comprises Cu powder, Cr powder, V powder, CuAlMn particles, graphene powder and graphite powder in a mass ratio of (40-60): (10-25): (0.1-1.5): (10-30): (0.5-1.5): (4-6). The friction material for the brake pad has the beneficial effects that the prepared friction material for the brake pad is low in friction coefficient, good in wear resistance and good in heat fading resistance, and the service life is prolonged; cu is used as a matrix, and Cr and V are used as reinforced matrix components, so that the material plays an important role in the overall strength and wear resistance of the material for the brake pad; the CuAlMn particles are adopted, so that unstable friction coefficient and brake failure caused by over-high temperature of the friction material for the brake pad under the high-temperature condition are effectively relieved; graphene and graphite are used as lubricating materials, so that the friction coefficient is effectively reduced and stabilized, and the thermal stability is improved.

The invention relates to the technical field of friction materials, and particularly discloses an electromagnetic brake friction material prepared from granules and a preparation process of the electromagnetic brake friction material in order to solve the problem that an existing electromagnetic brake friction plate is difficult to prepare or insufficient in performance. The reinforcing material comprises plasma modified aramid pulp, coupling modified composite mineral fibers, SiO2 coated tetrapod-like zinc oxide whiskers and carbon fiber-aluminum silicon whiskers; the filler comprises modified needle-like wollastonite and organic modified precipitated barium sulfate; the adhesive comprises boron-silicon synergistic modified phenolic resin and modified carboxy nitrile rubber. The raw materials are improved, and granules are prepared by adopting a mixing and crushing process, so that the content of an adhesive can be greatly reduced, meanwhile, the die filling efficiency can be improved, the die thickness and the high-temperature heat fading of the friction material can be reduced, a cold press molding process can be omitted, and the qualification rate of finished friction materials can be improved.

The invention discloses a carbon ceramic composite friction material and a preparation method thereof. The carbon ceramic composite friction material is prepared from the following raw materials in parts by weight: 5-10 parts of short carbon fibers, 15-25 parts of ceramic fibers, 15-25 parts of calcium sulfate whiskers, 10-15 parts of microporous filler, 3-5 parts of a friction increasing regulator, 3-5 parts of a friction reducing regulator, 0.2-0.5 part of superfine silicon carbide, 0.05-0.1 part of a dispersing agent, 3-6 parts of polysilazane and 3-5 parts of high-temperature-resistant phenolic resin. And 0.5-1 part of polytetrafluoroethylene powder. Polysilazane is adopted to treat short carbon fibers, so that the carbon fibers form a good ceramic high-temperature-resistant layer, and high-temperature oxidation of the carbon fibers in the carbon-ceramic composite friction material is effectively prevented; the use amount of phenolic resin is reduced, and the high-temperature stability of the carbon-ceramic composite friction material is improved. Through cooperation of the friction-increasing modifier, the friction-reducing modifier, the calcium sulfate whiskers, the microporous filler and the polytetrafluoroethylene, the friction coefficient is kept stable at high temperature during braking, and abrasion caused during high-load braking is reduced. Long-time high-temperature sintering is not needed in the production process, and energy-saving and environment-friendly preparation of the carbon-ceramic friction material is achieved.

The invention belongs to the technical field of brake pad materials, and particularly relates to a low-metal friction material for a racing car, a preparation method of the low-metal friction material, a brake pad and application. The low-metal friction material comprises the following raw materials: phenolic resin modified stainless steel, composite rubber, a lubricating material, a friction increasing material and a filler. Through the synergistic effect of the phenolic resin modified stainless steel, the composite rubber, the lubricating material, the friction increasing material and the filler, the low-metal friction material has stable friction coefficient, excellent wear resistance, low noise and excellent thermal stability.

The invention discloses a friction material for a brake pad, and relates to the technical field of friction materials. The friction material is prepared from, by weight, 15-35 parts of cashew nut shell oil modified phenolic resin, 2-10 parts of aramid fiber, 10-20 parts of graphite, 6-12 parts of modified basalt fiber, 4-16 parts of glass fiber, 4-8 parts of rubber powder, 3-6 parts of silicon nitride, 2-4 parts of sepiolite, 5-15 parts of barium sulfate, 3-6 parts of zircon powder and 2-10 parts of aluminum oxide. According to the prepared friction material, through the synergistic effect of all the components and optimization of interface bonding characteristics, the noise and vibration problems in the braking process are solved, meanwhile, the stable friction coefficient and wear rate can be maintained within a wide temperature range, performance degradation under the high-temperature working condition is effectively reduced, and the service life of a brake pad is prolonged.

The invention relates to the technical field of friction plates for vehicles, and particularly discloses a resin-based friction plate for an aluminum-ceramic brake disc and a preparation method of the resin-based friction plate for the aluminum-ceramic brake disc. Steel fibers serve as a main reinforcing phase, the structural strength of the material is improved, and meanwhile the steel fibers are good friction increasing materials; the reduced iron powder can improve the heat-conducting property of the brake pad and reduce the decline of the friction coefficient at high temperature; the red copper powder and the brass powder are good lubricants, the stability of single braking can be improved, and meanwhile abrasion is reduced; the silicon carbide mainly plays a role in increasing the high-temperature friction coefficient; molybdenum disulfide is beneficial for improving the recovery performance after high-temperature decline and reducing abrasion; antimony sulfide is lubricated at high temperature, and the friction coefficient in the decline stage is increased; silicon carbide is a high-hardness material, so that the friction coefficient is increased; the potassium magnesium titanate lamellar crystal improves the damping characteristic of the material and absorbs vibration and reduces noise, and the resin-based friction plate has the advantages of being high in strength, good in heat conduction, stable in friction performance, resistant to abrasion, comfortable in braking and the like and meets the use requirement of an aluminum ceramic brake disc.

A brake pad set (22) for disc brakes is shown, comprising an inner brake pad (24) and an outer brake pad (26). Each of the brake pads (22, 24) has a backing plate (28) and a brake lining (30, 32) attached to the backing plate (28), which comes into contact with a brake rotor during operation. The inner brake lining (30) and the outer brake lining (32) differ in size and preferably also in geometric shape in top view, wherein the wear volume of the inner brake pad (24) and the wear volume of the outer brake pad (26) differ by less than 10%. Furthermore, a vehicle brake (10) with such a brake pad set (22) is shown.

The invention belongs to the technical field of brake pad materials, and aims to solve the problems that the friction coefficient of an existing organic-based brake pad is unstable, so that brake failure is likely to occur, the driving safety is affected, the operation cost is increased due to frequent replacement of the brake pad, and normal operation of rail transit is affected. Therefore, the invention provides the organic track brake pad material with the high friction coefficient and the preparation method thereof. The material comprises 20-30% of thermosetting phenolic resin, 8-15% of bismaleimide resin, 8-12% of polyimide resin, 6-10% of high-strength carbon fiber, 6-10% of aramid fiber, 4-8% of basalt fiber, 3-6% of graphite, 2-5% of molybdenum disulfide, 3-6% of copper fiber, 2-5% of silicon carbide particles, 3-6% of barium sulfate, 2-4% of aluminum oxide, 2-4% of talcum powder, 2.5-5% of a curing agent and 1.5-3.5% of other auxiliaries. The friction performance of the organic track brake pad material is improved under the condition that other performance of the organic track brake pad material is not reduced, the defect of the friction performance of an existing brake pad material is effectively overcome, and reliable guarantee is provided for high-performance safe operation of track traffic.

The invention provides a brake disc, a preparation method, a braking system and a vehicle. The brake disc comprises a compact area and a plurality of nano-porous areas distributed in the compact area at intervals. Wherein the compact area comprises a carbon fiber reinforced silicon carbide material, and the nano-porous area comprises continuous-phase cracked carbon and carbon particles distributed in the cracked carbon; wherein the pore diameter of the nano-porous area is in the range of 10 nm to 100 nm, and the porosity is in the range of 15% to 30%. The nano porous area in the brake disc can improve the toughness of the brake disc, so that the service life of the carbon ceramic brake disc can be prolonged.

The invention discloses a copper-based friction plate of a wind power high-speed shaft brake and a manufacturing method, the friction plate comprises a friction material, the friction material comprises a friction layer and a friction layer, the friction layer comprises the following raw materials in percentage by weight: 65-72% of copper powder, 1-6% of iron powder, 3-10% of high-carbon ferrochrome powder, 8-15% of copper-tin-titanium powder and 15-20% of graphite powder; 1 to 5% of TiB2; and the transition layer comprises the following raw materials in percentage by weight: 70-75.4% of iron powder, 23-28% of copper powder, 1-3% of graphite powder and 0.6-1.2% of copper welding powder. The friction plate in the technical scheme is low in cost, does not contain harmful elements such as lead, meets the environmental protection requirement, integrates the advantages of a copper-based friction plate and an iron-based friction plate, has a stable friction factor and good wear resistance, and has the friction performance superior to that of an imported friction plate.

The invention discloses a nano-diamond reinforced powder metallurgy brake pad friction body material and a preparation method thereof, and relates to a brake pad friction body material and a preparation method thereof. The problem that in the prior art, the stability of a braking system of a train at a high running speed cannot be achieved is solved. The friction body material comprises a matrix component, a lubricating component, a friction component and a basic reinforcing component, wherein the sum of the mass percentages of the matrix component, the lubricating component, the friction component and the basic reinforcing component is 100%; wherein the mass percent of the copper powder in the matrix component is 50%-70%, and the mass percent of the iron powder in the matrix component is 10%-30%; the mass percent of the lubricating component is 10%-20%; the mass percent of the friction component is 1%-5%; the mass percent of the nano-diamond in the enhanced component is 0.1%-1%; the friction component is composed of one or more of silicon dioxide, aluminum oxide, titanium carbide, tungsten carbide, silicon carbide powder and zirconium oxide powder; the lubricating component is composed of one or more of graphite, carbon nanotubes and molybdenum disulfide. Belongs to the technical field of powder metallurgy.

The invention discloses a production method of a disc brake pad. The production method comprises the following steps: carrying out shot blasting treatment, blowing dust removal, cleaning and drying on the surface of a steel back plate; the pressing face of the steel back plate is glued through a gluing machine; preparing friction plate powder for compression molding; determining the distribution mass of each part of friction plate powder according to the model of the steel back plate; and the loaded friction plate powder is pressed on the pressing surface of the steel back plate by pressing equipment. According to the production method of the disc brake pad, the surface of the steel back plate can be clean and has good roughness by treating the surface of the steel back plate, so that the formed friction plate and the steel back plate have good connection performance, and the firmness of the friction plate is enhanced; and glue cannot be coated on the edge of the steel back plate by utilizing the glue coating machine, so that on one hand, the glue is saved, and on the other hand, the edge of the steel back plate cannot be adhered to some impurities or pressing equipment due to the glue.

The invention discloses a powder metallurgy brake lining material, a preparation method and a brake lining, the powder metallurgy brake lining material is obtained by sintering powder, and the powder metallurgy brake lining material comprises the following raw materials in parts by mass: 67-70 parts of electrolytic copper powder; 12 to 17 parts of iron powder; 5-9 parts of tungsten; 12 to 18 parts of flaky graphite; 7-9 parts of molybdenum disulfide; 5-8 parts of zirconium dioxide; 7 to 11 parts of nano silicon dioxide; the interface metallographic phase of a sintered body is improved, the combinability of all components in the powder metallurgy brake pad material is enhanced, the deformation resistance of the powder metallurgy brake pad material at high temperature is provided for the powder metallurgy brake pad material, and when a high-speed train brakes and the temperature of the brake pad is rapidly increased, all the components in the powder metallurgy brake pad material are tightly combined and are not prone to disengagement; and heat fading of friction performance of the powder metallurgy brake lining material is inhibited, so that excellent friction performance and low abrasion loss of the brake lining under high-speed braking are guaranteed.

A method is provided for decreasing a wear rate of a brake stack or a heat sink wear rate and increasing a brake life of the brake stack or the heat sink. The method includes coating a wear surface of a brake disk with at least one of an engineered ceramic material or ceramic solution, thereby forming a coated brake disk and installing the coated brake disk in a multi-disk brake system.

The invention discloses a mould pressing carbon ceramic brake disc and a preparation method and application thereof.The preparation method comprises the steps that continuous carbon fibers are chopped to obtain chopped carbon fibers, the chopped carbon fibers are mixed, resin glue liquid is sprayed while mixing is conducted, glue-coated carbon fibers are obtained, silicon-containing particles and auxiliaries are mixed to obtain mixed powder A, then the mixed powder A and resin powder are mixed to obtain mixed powder B, and the mixed powder B is added to the mould pressing carbon ceramic brake disc; and mixing the mixed powder B with the glue-coated carbon fibers to obtain a mixture, carrying out compression molding on the mixture to obtain a preform, carbonizing the preform to obtain a porous body, and siliconizing the porous body to obtain the composite material. According to the preparation method disclosed by the invention, the surface of the carbon fiber is treated by spraying a resin glue solution for the first time, a uniform protective layer is formed on the surface layer of the carbon fiber yarn, and an auxiliary agent is added into a mixture, so that a uniform capillary tube is formed when a preform is carbonized, the infiltration uniformity is promoted, and the uniformity of components, high density and low aperture ratio are ensured; therefore, the prepared molded carbon-ceramic brake disc is stable in performance, high in strength and resistant to high temperature.

The invention relates to the technical field of brake pads, in particular to a brake pad capable of reducing abrasion of a brake disc and a preparation technology thereof.The brake pad comprises, by weight, 20%-32% of reinforcing fibers, 12%-18% of a binder, 22%-34% of a friction regulator and 24%-38% of filler and functional additives, the reinforced fibers are at least one of titanium carbide coated carbon fibers, steel fibers and aluminum silicate ceramic fibers. According to the invention, the reinforced fibers construct a high-strength heat conduction network, and heat is quickly dispersed to reduce thermal stress concentration; the binder ensures the structural stability at high temperature; the friction regulator optimizes a friction coefficient curve through the synergistic effect of lubrication and friction increasing, and high-temperature fluctuation is avoided; the filler and the functional additive enhance the heat absorption and buffering capability, and adjust pores to relieve thermal shock. All the components have a synergistic effect, so that hot cracks of the brake disc can be reduced, and the crack resistance and the brake stability under extreme working conditions are improved.

Apparatus (1) for the heat treatment of articles, comprising a longitudinal casing (2), a convection tunnel furnace (3) positioned longitudinally within the casing (2) comprising a circuit for the production and forced circulation of hot air through said furnace (3), a plurality of stackable trays (4) where the articles can be housed, a conveyor (50) configured to transport at least one row of stacks of the stackable trays (4) through the furnace (3), a first thermal stabilization chamber (51) for the stacks of trays (4) with the articles to be treated communicating with an entrance door (31) of the furnace (3) and a second thermal stabilization chamber (52) for the stacks of trays (4) with the treated articles communicating with an exit door (32) of the furnace (3), comprising means for forced air suction (200) at least from the second thermal stabilization chamber (52) and means for recovery and introduction (210) of the suctioned air inside the furnace (3).

The invention relates to the field of wear-resistant materials, in particular to a preparation method of a phenolic resin friction material with a reinforced fiber interface, which comprises the following steps: 1, preparation of fibers with an organic silicon modified graphene oxide reinforced interface: pre-mixing graphene oxide and an organic silicon coupling agent for reaction, dispersing in a solvent under the condition of ultrasonic waves, and drying to obtain the fibers with the reinforced fiber interface; adding reinforced fibers into the graphene mixed solution; the phenolic resin, the reinforcing fibers and the filler are fully and evenly mixed and then poured into a preheated mold, heating compression is conducted under certain pressure and temperature, curing forming is conducted after a certain time, graphene oxide not only improves the interface bonding strength, but also improves the friction performance of the friction material; and the heat transfer efficiency of the whole composite material is also improved, so that the composite material has more stable performance under a high-temperature condition. The preparation method comprises the steps of mixing, dispersing, molding and curing the phenolic resin, the reinforced fibers, the graphene oxide and the coupling agent.

The invention provides a preparation method of a long-life multi-disc type carbon ceramic brake disc, which comprises the following steps: preparing a three-dimensional needling movable disc and static disc prefabricated body, performing chemical vapor deposition treatment on the prepared prefabricated body, machining the treated prefabricated body into a base body according to the size requirement of a finished product by adopting a machining method, and performing vacuum drying on the base body to obtain the long-life multi-disc type carbon ceramic brake disc. And respectively carrying out in-situ reaction densification on the carbon-carbon substrates of the movable disc and the static disc and the ceramic particles to obtain a high-density movable disc and a low-density static disc. The dynamic disc and the static disc are paired and subjected to differential matching, density regulation and control are strict, the density of the dynamic disc is high (2.2-2.35 g / cm < 3 >), the density of the static disc is low (1.8-1.9 g / cm < 3 >), dynamic and static cooperation and synergistic effect are achieved, the friction coefficient is maximized, abrasion is minimized, and the service life of a product is prolonged.

The present invention concerns the field of vehicle technology and industrial-plant technology and relates to a brake disc provided with protection from wear and corrosion and to a method for production thereof. The known solutions have the disadvantage that the coating for providing protection from corrosion and wear is applied to the frictional surfaces of the brake disc and is rubbed off straight away during the first braking operations. The present invention addresses the problem of providing a brake disc that has improved and durable protection from corrosion and wear. The significantly improved properties of the brake disc in terms of protection from corrosion and wear are achieved according to the invention by at least the region of the frictional surfaces (2) having an AlSi-based diffusion layer (3), which has a layer thickness of 0.1 mm to 0.6 mm and is formed in the process of interaction with the steel or grey cast iron of the metal main body (1). The brake disc according to the invention can be used for example in vehicles or as a braking system for industrial brakes or in wind turbines.

The invention discloses a CMC / UiO66-NH2 synergistically losslessly modified carbon cloth reinforced resin friction material as well as a method and application thereof, and belongs to the technical field of friction materials. Different from conventional nitric acid treated carbon fiber cloth, carboxymethyl cellulose with a film-forming characteristic is coated on the surface of the carbon fiber cloth, compact and uniform octahedral UiO66-NH2 crystal grains are grown in situ on the surface of the pretreated carbon fiber cloth through a solvothermal method, the UiO66-NH2-loaded carbon fiber cloth is washed with N, N-dimethylformamide and absolute ethyl alcohol respectively, and then the carbon fiber cloth is dried to obtain the UiO66-NH2-loaded carbon fiber cloth. And carrying out freeze drying, carrying out dipping treatment, and then carrying out hot-pressing curing to obtain the CMC / UiO66-NH2 synergistic lossless modified carbon cloth reinforced resin friction material. According to the invention, the carbon fiber cloth is synergistically modified by two components, and the two components and a resin matrix construct a rigid-flexible interface enhanced structure, so that the interface performance is improved, the mechanical properties and frictional wear properties of the friction material are remarkably improved, and the tensile strength is 470.74-554.49 MPa; the friction coefficient ranges from 0.111 to 0.128; and the wear rate is 2.33 * 10 <-12 >-6.10 * 10 <-12 > m < 3 > / (N.m).

A method for friction stir forming a metal matrix composite (MMC) structure (76). The method includes the step of providing a substrate (12) comprising a metallic material and securing a preformed MMC layer (14, 16) comprising an MMC material in a position overlying at least a portion of the substrate (12). The method further includes the step of friction stirring the preformed MMC layer (14, 16) with a friction stirring tool (50) which includes a rotating probe (56), including locating the probe (56) at a stirring depth at which the probe (56) extends through the preformed MMC layer (14, 16) into a portion of the substrate (12) and passing the tool (50) through the preformed MMC layer (14) at the stirring depth to friction stir the preformed MMC layer (14, 16) and integrate the preformed MMC layer (14, 16) with the substrate (12).

The invention discloses a powder metallurgy brake shoe for a locomotive and a preparation method, and relates to the technical field of metallurgy brake shoes, the powder metallurgy brake shoe comprises the following raw materials by mass percentage: 50%-70% of a matrix component, 10%-18% of a reinforcing component, 10%-16% of a lubricating component and 10%-16% of a friction component; the matrix component comprises electrolytic copper powder; the reinforcing components comprise reduced iron powder, superfine iron powder, atomized nickel powder, molybdenum powder and zinc powder; the lubricating component comprises artificial graphite and sulfide. According to the invention, the performance reduction of the brake shoe and the decline of a matrix at high temperature are effectively inhibited, the stability of a friction coefficient is kept, the abrasion is reduced, and the service life is prolonged.

The present invention specifically relates to a copper-based powder metallurgy friction material containing a pretreated MAX phase and its application. The raw materials used in the present invention include pre-burned powder, copper powder, nickel powder, iron powder, tungsten powder, graphite powder, boron carbide powder, and zirconium oxide powder. The raw materials used in the pre-burned powder are composed of copper powder A and Ti2AlN in a mass ratio of copper powder A:Ti2AlN = 1-6:1. The material is prepared by a process of ball milling followed by pre-burning, wherein the ball milling speed is 100-200 r / min and the time is 12-28 hours; the pre-burning temperature is 500-900°C and the time is 140-160 minutes. The preparation method of the product of the present invention includes the preparation of pre-burned powder, mixing, pressing and sintering. The resulting product has high hardness, friction coefficient, friction stability coefficient, compressive strength, and shear strength, and has a low wear rate on the brake disc. The components of the present invention are rationally designed, the process is simple and controllable, and the resulting product has excellent performance and is easy to industrialize and apply.

The utility model provides a testing device for a train brake pad friction block texture structure, belongs to the technical field of brake pad friction blocks, and aims to solve the stick-slip vibration phenomenon occurring when a high-speed train is braked. In the prior art, a large number of tests and debugging are needed and wide popularization is difficult to realize when the stick-slip vibration is inhibited by integrally changing the property of a friction block or installing a viscoelastic damper and the like. In the utility model, different textures are designed on the surface of the brake pad friction block; the surface texture design based on the friction blocks is adopted to restrain the stick-slip vibration phenomenon of the train braking system, the method is a method for actively restraining the stick-slip vibration from the source, the structure of the braking system does not need to be modified or increased or decreased, and therefore the operation and maintenance cost of a train is not increased, and popularization is easier to achieve.

The invention discloses a disc brake pad friction material and a preparation process thereof, and relates to the technical field of brake pads. The friction material is prepared from the following raw materials in parts by weight: 10 to 14 parts of phenolic resin, 10 to 12 parts of modified nitrile rubber, 1.5 to 2.5 parts of hexamethylenetetramine, 1 to 2 parts of calcium stearate, 0.5 to 1 part of magnesium oxide, 0.3 to 0.5 part of aluminum oxide, 2 to 4 parts of self-healing microcapsules, 5 to 7 parts of diatomite, 20 to 24g of barium sulfate, 21 to 25 parts of kaolin, 10 to 12 parts of calcium carbonate and 5 to 7 parts of graphite. The synthesized modified nitrile rubber is obtained by introducing a POSS structure, hydroxyl and hindered phenol into nitrile rubber, and the synthesized self-healing microcapsule is obtained by introducing dehydroabietic acid and a polysiloxane chain into the wall material of the microcapsule, namely the surface of urea-formaldehyde resin. The friction material is high in oxidation resistance, high temperature resistance, water resistance and self-healing capacity and has stable tribological performance.