92results about How to "Frictionally stable" patented technology

The invention belongs to the technical field of materials, and particularly relates to a hybrid fiber reinforced friction material for train braking and a preparation method thereof. In the invention, a composite modified phenolic resin is used as an adhesive, and hybrid fibers, including carbon fiber, metal fiber, inorganic mineral fiber and the like, are used as the reinforcing fibers. Compared with the prior art, the invention improves the contour machining property of the organic synthetic brake, and the yield of the material is high; the brake has stable frictional property at different braking speeds, does not has obvious degradation of frictional property at high speed, and does not have the phenomena of shedding and cracking on the working surface after the braking test. The friction material provided by the invention can be widely used for manufacturing brake pads, brakes, brake shoes and the like in braking systems of passenger and freight trains, municipal rail transportation, subways and the like.

A high-performance organic fibre brake pad comprises the following components according to weight percentages: 5-9% of cashew nut oil friction powder, 4-8% of chromite, 7-10% of barite, 4-7% of calcined petroleum coke, 3-7% of crystalline flake graphite, 3-6% of sepiolite fibre, 4-7% of ceramic fibre, 1.5-3% of antimony sulphide, 4-7% of red copper fibre, 3-5% of glued aluminium silicate fibre, 1-2% of alumina fibre, 8-11% of vermiculite powder, 9-13% of organosilicone phenol-formaldehyde resin, 1-2% of carbon fibre, 5-7% of bastose, 1-2.5% of wood pulp cellulose, 3-6% of viscose fibre, 6-9% of bamboo carbon fibre, 3-5% of nitrile rubber and 0.3-0.5% of zinc oxide. The invention has the advantages of light weight, strong wear resistance, good flexibility, low noise and long service life, and the like, and the friction performance is stable at operating temperature between 100 DEG C and 450 DEG C.

The invention provides an elastic high-speed brake lining, consisting of a steel backing (1), a brake block (2), a dovetail plate (3), a gasket (4), a disk spring (5), a guide sleeve (6), a bushing (7) and a rivet (8). The elastic structure high-speed brake lining provided by the invention has the advantages of high mechanical strength, small wearing capacity, stable friction performance, good thermal stability, good heat conductive performance, high dynamic moment and static moment, no noise, seawater corrosion resistance, sand wind prevention, excellent salt mist resistance and the like. Due to the elastic structure, the brake block of the high-speed brake lining is protected from eccentric wear caused by insufficient contact of the brake block of the high-speed brake lining and the surface of a brake disc, so that a high-speed train can brake smoothly, and the braking distance is short.

The invention embodiment discloses a high speed train powder metallurgy brake pad. The material of the brake pad comprises the following powder raw material by weight percent: 60 to 70 copper powder, 4 to 10 tin powder, 4 to 6 ferrous powder, 4 to 9 black lead, 2 to 3 silicon dioxide, 2 to 6 zinc powder, 3 to 5 molybdenum disulfide and 2 to 6 zircon. The invention further discloses the preparation technology of the powder metallurgy brake pad. The invention has the advantages that the copper with high thermal conductivity and good plasticity is used to be matrix, tin and zinc are added and alloyed in the sintering process, the sintering temperature is reduced, the abrasion performance is improved, the silicon dioxide and the zircon are added to improve friction coefficient, the black lead and the molybdenum disulfide serve as a lubrication component to protect duality and stabilize the friction coefficient. The abrasion of the brake pad produced through the method on a dual disc is small. The invention has the advantages of stable friction coefficient, small abnormal wear and noise occurrence probability and environmental protection and the brake performance thereof can meet the requirement of the high speed train.

The invention relates to a structure function integrated C/C-Si friction material and a preparation method thereof. The C/C-Si friction material comprises a mechanical structure layer, stress relief layers, and abrasion resistant layers. The mechanical structure layer contains a lot of laid fabric long fiber, and can improve the structural strength of the material; the abrasion resistant layers contain evenly distributed chopped carbon fiber, SiC, Si and a pyrolytic carbon phase, and can improve the wear resistance and friction performance stability of the material; the stress relief layers contain laid fabric long fiber in gradient distribution along a vertical ply direction, can relieve the thermal mismatch problem of the abrasion resistant layers and the mechanical structure layer during material preparation, and ensure the material structural integrity. The method provided by the invention is free of crusting phenomenon in preparation of a low density carbon/carbon composite material by chemical vapor deposition, can greatly reduce the preparation cycle of low density carbon/carbon composite material by chemical vapor deposition, and then reduces the preparation cycle and costof carbon ceramic friction material, and improves the friction performance stability. The technological method is suitable for industrial production.

The invention relates to a hemp fiber doped asbestine organic group free saloon car brake pad. The brake pad has the characteristics of stable friction coefficient, strong heat decay resistance, small abrasion rate, small vibration noise, low cost and the like, and is environmentally-friendly. According to the invention, the hemp fiber is subjected to combined treatment of microwave, ultrasonic wave and laser, and the hemp fiber is subjected to alkaline treatment before microwave treatment, thus on the basis of maintaining the advantages of the hemp fiber, the flexibility of the hemp fiber isenlarged, the friction property and heat resistance of the hemp fiber are improved, and the cohesiveness of the hemp fiber is improved. The invention also provides a preparation process of a saloon car brake pad.

The invention discloses an iron powder and steel fiber free ceramic friction material. The invention is characterized in that the ceramic friction material comprises the following components in percentage by weight: 5 to 15 percent of adhesive, 15 to 35 percent of reinforcing material, 15 to 30 percent of friction agent, 5 to 15 percent of friction reducer, 10 to 25 percent of filler and 10 to 20 percent of other mixture. Because the ceramic friction material does not contain metals, a brake block made of the ceramic friction material comprises a brake block and a braking disc instead of the conventional metal brake block and mating plate, avoids metal sound caused by friction, and eliminates the adhesion between the brake block and the braking disc. As the ceramic material is more capable of resisting high temperature than a metal material and has a small temperature sensitivity, the friction factor of the brake block produced by using the ceramic friction material is stable, free from corrosion to hub and braking noises and environment-friendly, has less dust and long service life. The ceramic friction material is suitable for manufacturing brake blocks for high-speed automobiles and heavy load automobiles.

The invention relates to a powder metallurgy brake block for a boxcar, composed of a brake shoe back (4) and a shoe block (3) which are connected with each other, wherein, the brake shoe back (4) adopts the material of QT400-18 and is shaped by casting once; the shoe block and the brake shoe back adopt the connection structure of welding or riveting; a powder metallurgy friction block (6) on the shoe block (3) adopts powder metallurgy friction materials, takes iron as matrix, is added with lead, graphite, supramoly, copper and aluminium sesquioxide and so on, all of which are mixed uniformly pro rata, and is formed by chill pressing and compression sintering. The invention is characterized by reliable structure, stable drag friction performance, low surface temperature rise, small relative dispersion and good wearing resistance, etc., and is suited to starting or towing a car on a railway with speed at or below 160km/h.

The invention discloses a clean ceramic brake material and a manufacturing method of the brake material. The clean ceramic brake material comprises the following compositions in percentage by weight: 3-6% of phenolic resin, 5-10% of silicone/alkyne resin, 15-30% of red copper/brass powder, 4-10% of inorganic binders, 7-12% of hexagonal boron nitride, 15-25% of reinforcing fibers, and the balance of packing, wherein the total weight is 100 parts. The clean ceramic brake material prepared according to the technical scheme of the invention has good high-temperature resistant performance, and canbe used for a long time at a temperature of 800 DEG C; the clean ceramic brake material is extremely stable in friction performance and good in abrasion resistance; especially in the process of application, nearly no black dust is produced, therefore, the cleaning of auto hubs can be maintained; and the braking is comfortable and smooth, and no vibration and brake noise is produced.

The invention relates to an abrasion-resisting part and a preparation method thereof, belongs to the field of new material science and relates to a braking and abrasion-resisting frictional material widely used in the industries of mining, oil extraction, ships, automobiles, metallurgy, paper making, wind power, bullet trains, nanomaterial sanding machines, ore grinding equipment and the like and a manufacturing technology thereof, in particular to a manufacturing technology for forming the abrasion-resisting part containing a macromolecular environmentally-friendly nano-composite ceramic material through vacuum pressing, and a formula includes a macromolecular adhesive, a structure reinforcement fiber and abrasion-resisting nano ceramic material and a friction performance regulator.

The invention discloses an Fe-Cr-B-Si/FeS composite solid lubricating film and a preparation method thereof, which firstly uses ultrasonic plasma for spray painting an Fe-Cr-B-Si coating on a substrate and then low temperature ion sulfurizing treatment is carried out to the Fe-Cr-B-Si coating and the Fe-Cr-B-Si/FeS composite solid lubricating film is prepared. The Fe-Cr-B-Si/FeS composite solid lubricating film is characterized in that: the Fe-Cr-B-Si coating is firstly painted and then the sulfurizing treatment is carried out to the coating so that the surface layer of the coating reacts with sulfurous steam to form an FeS layer, and finally, the upper part of the Fe-Cr-B-Si coating turns out to be an FeS solid lubricating layer. The invention has a novel structure and no obvious boundary exists on the FeS layer of the Fe-Cr-B-Si coating and the FeS layer has good binding capacity with the substrate. Compared with the prior art, the invention has good nano mechanical properties with an anti-friction capacity better than the prior art by more than 20 times. As the invention is the FeS layer obtained from sulfurizing on the surface of the Fe-Cr-B-Si coating, thus having a compact structure; besides, the friction property of the Fe-Cr-B-Si/FeS composite solid lubricating film is stable and the anti-friction property thereof is much better under the conditions of either dry friction or oiling.

A composite rubber crystal brake shoe with high friction coefficient for locomotive and train is disclosed. Its advantages are high friction coefficient, high antiwear performance, and long service life.

The invention provides an automotive brake pad with high graphite content and high friction property and stability. The automotive brake pad is prepared from potassium hexatitanate whisker, carbon fiber, phenol formaldehyde resin, fluorine rubber, calcined petroleum coke, graphite, flake graphite, grain graphite with the fineness of 16 meshes to 20 meshes, grain graphite with the fineness of 20 meshes to 40 meshes and filling. The invention further provides a preparation method of the automotive brake pad; the preparation method comprises the following steps after metering all the components in percentage by weight, putting the components into a stirrer and stirring and sufficiently mixing; weighing and adding raw material powder into a mold and putting the mold into a hot press; carrying out mold pressing and molding, pressure keeping and cooling; after de-molding, putting a product into a baking oven and carrying out heat treatment; carrying out heat treatment for 6h to 10h at the temperature of 120 DEG C to 160 DEG C; grinding through a grinding machine and spraying to obtain the automotive brake pad with the high graphite content and the high friction property and stability. The automotive brake pad provided by the invention has the characteristics of low noises, low heat fading, extremely stable friction coefficient, extremely low abrasion rate, uneasiness of damaging coupled parts and the like.

The invention discloses a preparation method of a powder metallurgy brake pad friction block for a high-speed train. The preparation method comprises the following steps that 1, friction body raw materials are placed into a drying machine to be dried, the corresponding weight parts of raw materials are placed into a mixing machine to be mixed, the mixture is transferred into an ultrasonic apparatus for ultrasonic treatment, and mixed friction body powder is obtained, wherein the friction body is prepared from Cu, Fe, MoS2, graphite, chromite powder, hematite powder and mullite powder; 2, the mixed friction body powder obtained in the step 1 is placed into an automatic powder pressing machine to be pressed and formed; and 3, the pressed friction block, a steel back and a welding pad are placed into an atmosphere sintering furnace to be sintered, and therefore the finished product is obtained. According to the preparation method, the process is simple, operation is easy, the cost is low, the prepared brake pad friction block is stable in friction performance, the friction coefficient can reach 0.35 or above, the abrasion rate is low, the hardness is moderate, cracking resistance and wear resistance are high, and the service life is long.

The invention relates to an oil-resistant paper-base friction plate and a production method thereof. The oil-resistant paper-base friction plate comprises the following materials in parts by weight: 0.8-1.2 parts of compounding agent, 2.5-5.5 parts of sulfur, 44-73 parts of filler, 20-28 parts of adhesive and 10-14 parts of butadiene-acrylonitrile rubber. The method comprises the following steps: S101: plastifying the butadiene-acrylonitrile rubber in a Banbury mixer; S102: adding the compounding agent, sulfur, filler, adhesive and plastified butadiene-acrylonitrile rubber into the Banbury mixer, and compounding to form the compounded rubber; S103: moving the compounded rubber into an open rubber mixing mill to form a rubber plate; and S104: winding a film outside the rubber plate for isolation. The production method can ensure the oil resistance of the friction material. The frictional property of the friction plate subjected to oil impregnation is the same as before oil impregnation, thereby simultaneously ensuring the stable frictional property and higher friction factor of the paper-base friction plate.

The invention provides a brake gasket with bundle-type acrylic fibers. The brake gasket is prepared by components which comprise, by weight, 8% to 20% of resin, 5% to 15% of bundle-type acrylic fibers, 20% to 40% of friction strengthening agents, 7% to 15% of friction reduction agents, and 15% to 45% of padding. The brake gasket with the bundle-type acrylic fibers has the advantages of being stable in friction coefficient, small in heat fading, small in abrasion and light in weight, and therefore the bundle-type acrylic fibers are novel good strengthening materials which can replace asbestos and be used for the automobile brake gasket, and have a good application prospect.

The invention discloses a boron carbide reinforced paper-based friction material and a preparation method thereof. The preparation method comprises the following steps: dissolving cashew nut shell oil modified phenolic resin into absolute ethyl alcohol to obtain a solution A; dispersing multiwalled carbon nanotubes into a sodium dodecyl sulfate water solution to obtain a suspending liquid B; dispersing chopped carbon fiber, bamboo fiber and boron carbide into water, and then, adding the suspending liquid B to obtain a solution C; defibering the solution C, then, making sheets and drying to obtain a sample sheet D; and spraying the solution A on the sample sheet D, airing and carrying out hot press molding to obtain the boron carbide reinforced paper-based friction material, wherein the boron carbide reinforced paper-based friction material has the dynamic friction coefficient of 0.139-0.147 and the wear rate of 4.5*10<-8>. According to the invention, the paper-based friction material is prepared by adding boron carbide as reinforcing phase into the raw materials, so that the process is simple and easy to control, the braking stability and friction coefficient of the paper-based friction material can be greatly improved, the friction performance can be greatly improved, and the wear rate can be effectively reduced.