157results about How to "Best friction and wear resistance" patented technology

The invention discloses an environmental ceramic base friction material free of copper or metal and a preparation method of the material. The environmental ceramic base friction material is characterized by comprising the following components by weight percent: 6-12% of phenolic resin, 2-10% of ceramic fiber, 2-8% of inorganic fiber, 2-10% of rubber, 4-12% of graphite, 10-25% of potassium titanate lamella, 3-15% of mineral fiber, 4-20% of metal sulfur compound, 6-20% of grinding aid and 5-20% of filler. The prepared friction material has excellent friction and wear properties, high heat-conducting property, excellent high-temperature decline property, stable friction coefficient, and excellent noise performance.

The invention discloses a preparation method for a carbon fiber enhanced carbon-carborundum double-matrix abrasive material. Short chopped carbon fiber, graphite powder, industrial silicon powder and caking agent are employed to be pressed into the block material of carbon fiber enhanced graphite powder and silicon powder (C/C-Si) in a cooling way; then mechanical cracking and pelleting are carried out to the prepared C/C-Si block material; next, the grains are thermally pressed into a C/C-Si biscuit; and then the C/C-Si biscuit is carbonized to prepare a C/C-Si porous body; and finally non-dipping directional fused silica impregnating is carried out to the C/C-Si porous body to prepare the carbon fiber enhanced carbon-carborundum double-matrix (C/C-SiC) abrasive material. The invention relates to a preparation method for a carbon fiber enhanced carbon-carborundum double-matrix abrasive material having higher mechanical property and excellent abrasion resistance and wear performances,with the advantages of short preparation cycle, low cost, and being capable of engineering.

The invention relates to a high performance and low cost C/C-SiC composite brake disc, a preparation method and application thereof. The preparation method includes: carbonizing a brake disc prefab, and densifying the carbonized brake disc prefab by chemical vapor infiltration method to obtain a C/C composite material; then performing heat treatment in an inert atmosphere to improve the graphitization degree of the composite material; then conducting machining to obtain a C/C composite blank; treating the C/C composite blank by molten silicon infiltration method to obtain a C/C-SiC composite brake disc; then treating the C/C-SiC composite brake disc by means of chemical vapor infiltration or precursor infiltration pyrolysis; and machining the obtained product into a final design size, thus obtaining a composite brake disc finished product. The C/C-SiC composite brake disc and the preparation method thereof provided by the invention can reduce the preparation cost and improve the mechanical performance, thermal conductivity and friction and wear performance of the brake disc.

The invention discloses a brake pad material for a high-speed railway passenger train and a preparing method thereof and belongs to the technical field of powder metallurgy friction materials. The brake pad material is prepared by the following steps: after drying and sieving powdery raw materials, feeding the raw materials into a mixer, and spraying an adhesive; after mixing the materials, placing the materials in a steel mould, and carrying out pressing; and then, carrying out sintering at a reduction atmosphere, and then, carrying out heat treatment in a reduction atmosphere, wherein the powdery raw materials comprise copper powder, iron powder, Ti2AlC powder, chromium powder, nickel powder, manganese powder, silicon dioxide, graphite, boron nitride and molybdenum disulfate. The invention further provides the preparing method of the brake pad material. In the invention, in-situ TiC obtained through the Ti2AlC is used as a main friction component, the material of an in-situ nanometer TiC layered framework is prepared, the copper is accordingly used as a matrix, a small quantity of other metals is added, the content of lubricating components, such as the graphite, is regulated, and a novel material with a great brake effect and a low wear rate is finally obtained. The material is suitable for being used as the brake pad material for the high-speed railway passenger train.

A preparation method of a C/C-SiC-MoSi2 ceramic-based composite material includes the following steps: 1) dispersing silicon carbide powder and molybdenum disilicide powder in isopropyl alcohol, and performing ultrasound vibration and stirring to obtain a suspension liquid A and a suspension liquid B: 2) increasing the density of a low-density carbon fiber stereo fabric in a manner of hydrothermal permeation of glucose, and placing the fabric in a suction filtration device having a glass sand core; 3) pouring the suspension liquid A and the suspension liquid B successively into a suction filtration flat-bottom funnel to enable the suspension liquids to pass the C/C composite material completely; 4) performing a homogeneous phase hydrothermal reaction until the density is 1.2-1.5 g/cm<3>; and 5) performing thermal treatment to obtain the C/C-SiC-MoSi2 ceramic-based composite material. The composite material is moderated in density, is compact in structure, and is excellent in interface binding between a C/C interface and a SiC interface, the SiC interface and a MoSi2 interface and the C/C interface and the MoSi2 interface. The raw materials are easy to obtain. The preparation method is simple in operation, is low in cost, is environment-friendly and is pollution-free.

The invention discloses a preparation method of a copper-based friction material with uniformly-distributed ferrum phase, and belongs to the technical field of preparation of powder metallurgy copper-based friction materials. The preparation method comprises the following steps that, by mass percentage, 70-80% of copper-iron alloy powder is taken as a matrix raw material of the copper-based friction material, 5-10% of tin powder, 1-5% of nickel powder, 5-10% of scale-like graphite powder, 1-10% of silica powder, 1-5% of molybdenum disulfide and 5-15% of mullite are added into the copper-iron alloy powder, all the materials are uniformly mixed according to a certain ratio and are subjected to cold-pressing forming and hot-pressing sintering to obtain the copper-based friction material with the ferrum phase uniformly distributed on phase interfaces between the matrix and the additive components, wherein the sintering temperature is 850-950 DEG C, and the heat preservation time is 2-3 hours. The copper-iron alloy powder is prepared by adopting an argon atomization mode, and the mass fraction of the iron element is 2-4%. The copper-iron alloy powder replaces pure copper powder to be taken as the matrix raw material, the ferrum phase can be uniformly distributed on the phase interfaces, so that the interface strength is improved, and meanwhile the wettability between the copper and the graphite is improved; and the prepared copper-based powder metallurgy material for a brake pad is small in porosity, high in matrix strength and has more excellent friction and abrasion performance compared with materials used in a traditional brake pad.

The invention relates to a preparation method of an h-BN (hexagonal Boron Nitride) added titanium boride-based self-lubricating ceramic cutter material. According to the method, the material is formed in such a way that TiB2 as a base body, added micron WC (Wolfram Carbide) as a reinforced phase, the micron h-BN as a solid lubricant, and micron Mo and micron Ni as sintering additives are sintered. The preparation method comprises the following steps: respectively dispersing the micron TiB2 powder, the micron WC powder and the micron h-BN powder, and carrying out ball milling and drying so as to obtain powders, and finally, sintering the powders through a hot pressing method. The method has the advantages of simplicity, convenience in operation and the like. The self-lubricating ceramic cutter material has an excellent comprehensive mechanical property and an anti-friction wear-resisting property, and can be used for fabricating cutting tools, dies and other friction-resistant corrosion-resistant parts.

The invention discloses an environment-friendly lead-free copper-based self-lubricating material and a preparation process thereof. The component of copper alloy powder is atomized CuSn8Nil, the granularity of the atomized CuSn8Nil is 200 meshes, and the granularity of Al powder is 200 meshes; and the copper alloy powder comprises the following components in percentage by mass: 90 to 96 percent of atomized CuSn8Nil, and 4 to 10 percent of aluminum. The preparation process comprises the following steps of: (1) mixing, (2) making a supporting steel back, (3) spreading powder, (4) loosening and sintering, (5) blooming, (6) re-sintering, (7) re-rolling, and (8) annealing and finish rolling. The invention discloses the environment-friendly lead-free copper-based self-lubricating material with good bonding performance and good friction and abrasion resistance and the preparation process thereof.

The invention discloses a carbon structure film and graphene additive solid-liquid composite anti-friction and anti-abrasion method. Nano-structure films made of fullerene-like carbon, graphite-like carbon, onion-like carbon, graphene and the like are prepared and matched in pairs to form friction pairs, and graphene nano-particles serve as lubricating oil additives, so that the friction coefficient and the wear rate are remarkably reduced, the service life is prolonged, and the sensitivity and the reliability are improved. Carbon structure films and graphene additives can efficiently and lastingly form a friction film easy to shear in a friction interface. The film can be used for resisting abrasion on surfaces of metal, ceramic and polymer materials and reducing the friction coefficient,the graphene additive in use can be various sold or self-made products. The method aims to solve the problem that the service life, sensitivity and reliability of existing high-end equipment, aerospace parts and the like can not meet the requirements in 10-15 years.

The invention discloses a preparation method for a para aminobenzoic acid lossless modified carbon fiber enhanced paper base wet-type friction material. Carbon fibers, para aminobenzoic acid and excessive hydrochloric acid are added to a three-neck flask, a certain quantity of sodium nitrite is slowly added after a reaction reaches certain temperature, a short-time diazo-reaction is conducted under the condition of a magnetic stirring oil bath, and carbon fibers with the surfaces grafted by benzoic acid are obtained. Then, the modified carbon fibers, aramid fibers, paper fibers, padding and resin are mixed to prepare friction material base paper, the friction material base paper is then hot-pressed and solidified, and the para aminobenzoic acid modified paper base wet-type friction material is obtained. A friction material sample is subjected to a frictional wear performance test, the dynamic friction coefficient of the sample reaches 0.12 to 0.15, the wear rate is 0.9*10<8>cm<3>/J to 1.2*10<8>cm<3>/J, the excellent frictional wear performance is shown, the technological process is simple, cost is low, and the preparation method is an efficient and environment-friendly graft modification treatment method and has the wide application prospect.

The invention provides a preparation method for a lamellar C/C-SiC-MoSi2 ceramic matrix composite. The method comprises the steps that silicon carbide powder and molybdenum disilicide powder are dispersed in isopropyl alcohol and then stirred evenly after iodine is added, and first suspension liquid and second suspension liquid is obtained; the density of a carbon-fiber three-dimensional fabric is increased by adopting the mode of hydrothermal glucose permeation, the carbon-fiber three-dimensional fabric is clamped in a specially-made hydrothermal kettle with a positive electrode and a negative electrode, then the specially-made hydrothermal kettle is placed in a drying oven for heat preservation, and then hydrothermal electrophoretic deposition is performed; homogeneous-phase hydrothermal treatment is repeatedly performed in an aqueous glucose solution until the density reaches 1.3-1.5 g/cm<3>, and then heat treatment is performed after the fabric is dried. According to the preparation method for the lamellar C/C-SiC-MoSi2 ceramic matrix composite, the prepared composite is moderate in density and compact in structure, and binding between a C/C interface and a SiC interface, binding between the SiC interface and a MoSi2 interface and binding between the C/C interface and the MoSi2 interface are good; the composite with the high strength and the good high-temperature oxidation resistance can be obtained at low temperature, and the preparation method has the advantages that the raw materials are easy to obtain, the preparation technology is simple, operation is easy and convenient, and the cost is low.

The invention discloses a copper-graphite-tungsten disulfide nanotube self-lubricating composite material and a preparation method thereof, wherein the self-lubricating composite material is prepared by taking copper as a substrate and graphite as well as tungsten disulfide nanotube as solid lubricating additives through a spark plasma sintering process, and consists of the following components in percentage by weight: 80-90% of copper, 7-10% of graphite and 3-10% of tungsten disulfide nanotube. The preparation method comprises the following steps of: grinding, sensitizing, activating and chemically copper-plating the tungsten disulfide nanotube, uniformly mixing with electrolytic copper powder and graphite powder in proportion through a mechanical ball-milling process; and implementing a spark plasma sintering process to the mixing powder, to prepare the tungsten disulfide nanotube and graphite reinforced copper-base self-lubricating composite material. The copper-base self-lubricating composite material prepared by the preparation method disclosed by the invention is high in mechanical intensity, excellent in friction and abrasion resistance and good in environmental suitability.

The invention relates to a method for preparing a sliding bearing by using a polyether-ether-ketone composite material, which comprises the following steps: firstly, performing air oxidation treatmentto carbon fibers, wherein the oxidation temperature is 450-500 DEG C and the oxidation time is 1-3min; secondly, laying a layer of bronze powder with thickness of 0.25-0.3mm on a steel plate, sintering the bronze powder and the steel plate substrate together at a temperature 800 DEG C for 2h; rolling a polymer layer of thickness of 0.01-0.03mm on an interlayer of the bronze powder, wherein the pressure is 12MPa, the polymer layer comprises the following raw materials in percentage by weight: 70-95 percent of polyether-ether-ketone, 1-5 percent of molybdenum disulfide and 4-25 percent of carbon fibers; sintering under the condition of nitrogen protection, at 340 DEG C, machining and modifying, rolling, and welding to form a sliding bearing made of the composite material. The invention canimprove the interface bonding performance and the friction coefficient of the composite material to enable the sliding bearing to have excellent friction wear performance.

The invention discloses a ZrCN nanometer composite membrane which is prepared through a double-target radio-frequency reactive sputtering method and uses stainless steel as a stratum base. The thickness of the ZrCN nanometer composite membrane is 1-3 micrometers, 7.2at.%<=C<=11.9at.%, atomic ratio of (C+N)/Zr is less than 1, C enters ZrN interstitial void to totally form interstitial solid solution, and the hardness of the ZrCN nanometer composite membrane is larger than or equal to 29GPa; or 13.2at.%<=C<=15.4at.%, atomic ratio of (C+N)/Zr is larger than 1, the remaining C (except for the part of C entering the ZrN interstitial void to totally form interstitial solid solution) forms amorphous CN or C elementary substance, and the hardness of the ZrNC nanometer composite membrane is larger than or equal to 18.5GPa.

The invention discloses a wear-resistant copper-matrix gradient material for use in manufacture of pantograph slide plates and a preparation method thereof. The wear-resistant copper-matrix gradient material consists of a copper-zirconium oxide layer, a pure copper layer and a copper-graphite layer. The preparation method comprises the following steps: evenly mixing copper powder and zirconium oxide powder in a ball grinder according to a mass ratio; evenly mixing copper powder and graphite powder in the ball grinder according to a mass ratio; placing the copper-zirconium oxide layer, the pure copper layer and the copper-graphite layer in a mould according to a thickness ratio; placing the mould in a cold isostatic press for press forming; removing the molded material from the mould and sintering the molded mater in a vacuum environment to obtain the copper-matrix gradient wear-resistant material. The wear-resistant copper-matrix gradient material for use in manufacture of pantograph slide plates and the preparation method thereof have advantages of simple preparation process and suitability for industrial large-scale production. The obtained copper-matrix gradient wear-resistant material is used for manufacturing pantograph slide plates for electric locomotives.

The invention provides a high-performance clutch plate for a heavy truck. The high-performance clutch plate for the heavy truck achieves the technical purposes of being novel in structure, reasonable in material formula and balanced and excellent in performance index, cost and application effect. The high-performance clutch plate for the heavy truck is divided into a friction working layer and a structural layer. The friction working layer comprises at least three friction linings made of different materials. The three friction linings made of the different materials comprise the rubber-based friction linings, the substitute rubber FA friction linings and the ceramic fiber friction linings, all of which are of the same thickness. The high-performance clutch plate has the following beneficial effects that due to the fact that the rubber-based friction linings, the ceramic fiber friction linings and the substitute rubber FA friction linings are arranged on the surface of the structural layer in a mixed manner, in clutch operation of the clutch plate, the characteristics of the three different materials can be brought into play, when the clutch plate is applied to a clutch mechanism of the heavy truck, friction force resistant to attenuation and stable at high temperature is effectively reduced, and the high-performance clutch plate is particularly suitable for being applied to the heavy truck.

The invention discloses a friction material with a good wear-in property, and the friction material consists of following ingredients in parts by weight: 16 to 18 parts of bucrilate modified phenol resin, 2 to 3 parts of aramid fiber, 3 to 5 parts of copper fiber, 7 to 9 parts of vermiculite fiber, 5 to 7 parts of calcium carbonate whisker, 3 to 5 parts of 60-mesh to 150-mesh silicon dioxide, 3 to 5 parts of 200-mesh to 320-mesh aluminum oxide, 2 to 4 parts of colloid molybdenum disulfide, 6 to 8 parts of -120-mesh crystalline flake graphite, 3 to 5 parts of -200-mesh antimony sulfide powder and 10 to 12 parts of -200-mesh light calcium carbonate.

The invention discloses a molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film and a preparation method and application thereof. The molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film comprises a titanium transition layer, a titanium/tantalum/molybdenum disulfide/tungsten disulfide multi-layer gradient transition layer and a molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped layer which are laminated in the thickness of the film in sequence. The preparation method comprises the step that a magnetron sputtering technology is adopted for depositing the titanium transition layer, the titanium/tantalum/molybdenum disulfide/tungsten disulfide multi-layer gradient transition layer and the molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped layer on the surface of a substrate in sequence to obtain the molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film. The molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film has good bonding strength with the substrate, rigidity and elasticity modulus, has good friction and wear resistance, good temperature self-adaptability,damp heat resistance and high-temperature-oxidation resistance at different temperatures in the atmospheric environment, and can meet the demands of aerospace crafts for stable lubrication and long service life.