1290results 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 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 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 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 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 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 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.

A method is provided for refurbishing a C / C disk of a first thickness and coated with a first ceramic solution for a second life. The method includes machining the C / C disk of the first thickness to remove a coating of the first ceramic solution from the wear surfaces of the C / C disk of the first thickness. Removing the coating of the first ceramic solution further removes a portion of the C / C disk thereby forming a C / C disk of a second thickness. The second thickness is less than the first thickness. The method further includes coating the wear surfaces of the C / C disk of the second thickness with a second ceramic solution, thereby forming a C / C disk of the second thickness coated with the second ceramic solution. Additionally, the method includes drying the C / C disk of the second thickness coated with the second ceramic solution.

The invention relates to a brake disk (3), which has at least one thermal conduction layer (4, 6) with a thermal conductivity and specific thermal resistivity that can be graduated, the thermal conduction layer consisting of at least two different materials or of a varying layer thickness, thereby graduating the thermal conductivity or the thermal resistivity within the thermal conduction layer.

Provided are: a friction member including a friction material composed of a thermoplastic resin composition and having a high friction coefficient; and a method for manufacturing the friction member. More specifically, provided is a method for manufacturing a friction member including at least a friction material and a back plate supporting the friction material, the method being characterized in that: the method includes a step for forming the friction material and the back plate in the same molding cycle by melt-molding a resin composition at the softening / pour temperature of a thermoplastic resin (A) or higher; and, in the resin composition, the thermoplastic resin (A), having a melt viscosity (V6) of 30 Pa•s or less and a flow softening temperature of 130°C or higher, and an inorganic filler (B) are blended as essential components, and the blending amount of the thermoplastic resin (A) is 50 parts by mass or less with respect to 100 parts by mass of the resin composition.

The invention relates to the field of carbon-ceramic composite materials, in particular to a non-compact carbon-ceramic friction material and a preparation method and application thereof. The non-compact carbon-ceramic friction material is obtained by conducting siliconizing treatment on a C / C-Si green body through silicon powder. The C / C-Si green body is prepared from short carbon fibers, graphite powder, a silicon iron mixture, silicon carbide powder, boron nitride powder and phenolic resin powder. The porosity of the non-compact carbon ceramic friction material is 15 to 25 vol.%; the high-temperature-resistant limiting temperature is 1350 DEG C; the compression strength is 80.5 + / -2.4 MPa; the abrasion loss of the prepared friction plate in an AK-master program test ranges from 52.8 micrometers to 95.0 micrometers, and the friction coefficient ranges from 0.6 to 0.7. Compared with a friction material in the prior art, the friction material has the advantages of non-compactness, light weight, high temperature resistance and the like.

A brake disc for a disc brake may have a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The disc is provided with a base layer constituted by steel having a nickel content of at most 15% which covers at least one of the two braking surfaces of the braking band.

The utility model relates to the field of brakes of automobiles, and discloses a disc brake convenient for mounting and replacing a friction block, which comprises a brake caliper main body, the friction block and a fixing mechanism, the brake caliper comprises a brake caliper body, connecting mounting seats are arranged on the brake caliper body, mounting grooves are formed in the two mounting seats, mounting plates are arranged in the two mounting grooves, friction blocks are fixedly connected to one sides of the two mounting plates, fixing mechanisms are arranged on the two mounting seats, and the two fixing mechanisms are connected with the two mounting plates correspondingly. And the fixing mechanism comprises a ball body, a U-shaped plate, a spring, a liquid storage tank, a movable plate and a threaded rod. Compared with the prior art, the brake has the advantages that the friction block can be quickly mounted and dismounted without external tools through cooperation of all the components, convenience and efficiency are improved, the structure is simple, operation is easy, and the use effect of the brake is effectively improved.

The invention relates to the technical field of brake friction materials, and particularly discloses a brake pad mixture, a composite brake pad and a preparation method and application of the composite brake pad. The brake lining mixture provided by the invention is prepared from the following components in parts by weight: 10 to 13 parts of liquid nitrile rubber, 8 to 12 parts of modified phenolic resin, 20 to 40 parts of reinforced fiber, 8 to 12 parts of calcium hydroxide, 1 to 3 parts of light magnesium oxide, 10 to 15 parts of calcium carbonate whisker, 2 to 5 parts of calcined aluminum oxide, 10 to 15 parts of graphite, 5 to 10 parts of heavy calcium carbonate, 0.8 to 1.2 parts of sulfur and 0.8 to 1.2 parts of accelerant. The reinforced fibers comprise steel fibers, aramid fibers and mineral fibers in a weight ratio of (10-25): 1: (5-15). According to the brake pad mixture and the preparation method of the synthetic brake pad, the synthetic brake pad which is good in friction stability and small in batch-to-batch difference can be prepared, and when the synthetic brake pad is used for a traffic vehicle braking system, the safety is high, and the reliability is good.

The invention discloses a low-liquid-volume automobile brake caliper and a liquid casting and forging forming method, and relates to the technical field of automobile brake calipers and casting and forging forming, the low-liquid-volume automobile brake caliper comprises a caliper body and a caliper body support, bolts are arranged on the left side and the right side of the caliper body and the left side and the right side of the caliper body support, and the bolts are used for fixing the caliper body and the caliper body support; an oil cylinder is arranged in the center of the top of the caliper body, a piston is arranged in the oil cylinder, a brake block is arranged in the piston, an inner friction plate and an outer friction plate are embedded into the upper end and the lower end of the caliper body support respectively, a fixing ring is welded to the center of back steel on the top of the inner friction plate, and a first reset structure is arranged in the center of the fixing ring which is fixedly connected with the piston. Reset structures II are arranged at the two ends of the inner friction plate and the outer friction plate; through the reset structure, the idle stroke of the brake pedal is reduced, the dragging torque is reduced, the response speed of the brake system is increased, and the overall efficiency and performance of the brake system are improved.

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

A bicycle disk brake pad and a method for making the same are provided. The bicycle disk brake pad includes a heat dissipation member and a friction member provided with a stainless steel substrate and a friction pad attached to the substrate by sintering. The heat dissipation member is made of aluminum alloy-stainless steel clad metal plate while a joined plate of the heat dissipation member is directly formed by stainless steel sheet of the aluminum alloy-stainless steel clad metal plate. Then the substrate and the joined plate are connected by laser welding. The substrate of the friction member and the joined plate of the heat dissipation member both made of stainless steel prevent the disk brake pad from deformation at high temperature due to reliable structural strength provided by the stainless steel. Aluminum alloy with excellent thermal conductivity helps dissipate heat from the disk brake pad more effectively.

A brake unit for a wind turbine is provided. The brake unit can include a mounting ring configured to couple the brake unit with the wind turbine, a piston movably coupled with the mounting ring such that an upper portion of the piston is positioned and located proximate to the mounting ring, a lining coupled with the piston, wherein the lining is positioned and located adjacent to an opposing end of the piston from the mounting ring, and a gap positioned between a first component of the brake unit and a second component of the brake unit, wherein the gap is configured to indicate a thickness of the lining.

The single-face wet clutch suitable for the narrow space comprises a clutch outer hub and a clutch inner hub, and a plurality of first clutch plates are arranged on the inner side of the clutch outer hub in a bonding mode; a plurality of second clutch plates are arranged on the inner side of the clutch inner hub in a bonding manner; the first clutch plate and the second clutch plate are oppositely arranged in a penetrating mode, and at least one of the contact faces of the first clutch plate and the second clutch plate is a curve face. The single-face clutch can shorten the axial size of the clutch assembly and is suitable for a narrow space with insufficient axial length; the bent clutch plates can enable the clutch plates to be distributed more evenly in the axial direction in the separation state, the combination and separation consistency of the clutch assembly is improved, meanwhile, the guide effect of oil in the radial outer side direction is improved through the bent clutch plates, the oil can be rapidly discharged, the lubricating and cooling effects can be rapidly achieved, the dragging torque is reduced, and the service life of the clutch assembly is prolonged. The product efficiency is improved.