249results about How to "Improve friction and wear properties" 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 preparation method comprises: 1) raw material processing: placing graphite, coke blacking, chopped carbon fiber and modifier at the drying cabinet to remove moisture from them; the drying temperature is 100 deg. C, and the drying time is 2-4 hours; 2) blending: evenly blending the graphite, coke blacking and chopped carbon fiber; adding the copper powder, copper fiber and modifier; in the last, adding phenolic resin to make mould material; 3) hot compacting and forming: placing the mould materials into die; heating and pressing it to make solidification forming; the press is 50-100MP, and the temperature is 160-170 deg. C; keeping 0.5-1 hours in room temperature; 4) sintering: making the sintering form the sample; the temperature is 800-900 deg. C, and the time length is 2-4 hours; 5) densification processing: after chemical vapor deposition or bituminizing, making the carbonizing treatment.

The invention discloses a rotational molding wear-resistant polyolefin resin and a preparation method thereof. In the rotational molding wear-resistant polyolefin resin, raw materials commonly used in the rotational molding process, namely linear low-density polyethylene, high-density polyethylene or polypropylene is taken as a matrix material; and by adding components of an inorganic filler, ultrahigh molecular weight polyethylene and a lubricant, the wear resistance of the matrix resin is improved. The rotational molding wear-resistant polyolefin resin consists of the following components in percentage by mass: 70 to 80 percent of matrix resin, 10 to 15 percent of inorganic filler subjected to surface treatment, 4 to 13 percent of ultrahigh molecular weight polyethylene and 1.5 to 2 percent of lubricant, wherein the matrix resin is the linear low-density polyethylene, the high-density polyethylene or the polypropylene; and a range of a melt flow rate of the matrix resin is between 2g/10min and 15g/10min.

The invention discloses a method for preparing a graphene film on the surface of titanium alloy. The method specifically comprises the following steps of putting a medical titanium alloy into a piranha solution and carrying out hydroxylation treatment, and then putting into an amino silane solution, and self-assembling a silane film; carrying out ultrasonic treatment on graphene oxide powder to obtain a stable graphene oxide colloid; immersing the titanium alloy of which the surface is attached with the silane film in the graphene oxide colloid to prepare a silane-graphene oxide film; and finally, reducing the graphene oxide film with hydrogen halide acid, and drying to obtain the reduced graphene oxide composite film. The method disclosed by the invention is simple and causes no harm to experiment operators, and the obtained film has the advantages of good integrity, high strength, low coefficient of friction and excellent wear resistance and is expected to become a medical joint material.

The invention discloses a high-density, abrasion-proof self-lubricating polyformaldehyde material and making method, which comprises the following steps: drying 50-99% polyformaldehyde at 60-90 deg.c for 4-6h; adding 1-50% polyethylene oxide, 0.01-1% polyformaldehyde stabilizer, 0.01-1% formaldehyde and 0.01-1% formaldehyde adsorbent into high-speed stirrer to blend evenly; fusing at 170-200 deg.c to squeeze; cooling the squeezed material below crystallizing temperature of polyethylene oxide with cooling speed at 50-80deg.c/min; obtaining the product with high flexibility between the interior of polyformaldehyde spherulite and spherulite.

A multilayered sliding member has a resin composition filled in pores of, and coated on the surface of, a porous sintered metal layer 2 formed on the surface of a metallic backing plate 1. The resin composition is formed by compounding a phosphate, a carbon black, a melt moldable fluororesin, and a PTFE serving as a principal component, and is preferably formed by further containing graphite and/or a low molecular weight PTFE.

The invention relates to a preparation method of self-lubricating ceramic cutting tool material comprising spherical nanometer silicon dioxide coated hexagonal boron nitride composite powder. The self-lubricating ceramic cutting tool material comprises the following raw material components in percentage by volume: 15-75% of TiC, 2-20% of h-BN@SiO2, 0.2-2.5% of MgO and the balance of Al2O3, wherein the h-BN@SiO2 is the spherical silicon dioxide coated hexagonal boron nitride composite powder which is obtained by dispersing h-BN powder in absolute ethyl alcohol and dropwise adding tetraethyl orthosilicate at the temperature of 30-70 DEG C. The invention also provides the preparation method of the self-lubricating ceramic cutting tool material. The added h-BN@SiO2 can improve the wettability of h-BN@SiO2 and a matrix and the mechanical property of the cutting tool material when the excellent lubricating property of the cutting tool material is remained, and reduce the agglomeration of air holes and the h-BN@SiO2 and the negative influence of the added h-BN on the mechanical property of the self-lubricating ceramic cutting tool material. The self-lubricating ceramic cutting tool material is suitable for application in manufacturing of self-lubricating ceramic cutting tools and can also be used for manufacturing ceramic molds, bearings and other wear-resisting anti-corrosion components and parts.

The invention relates to a carbon fiber composite fabric or a carbon-copper compound material and the method thereof. The invention takes a porous carbon body prepared by the carbon fiber composite fabric densification as the prefabricated part, and the copper alloy is infiltrated in the pore of the prefabricated part. By adoption the method of no-pressure melt infiltration, the invention features the simple process, low cost, and easy realization of the industrialization, and is capable to prepare the carbon fiber composite fabric or the carbon-copper compound material with high electrical conductivity, outstanding self lubrication wear resistance performance, excellent hot-proof and anti-vibration and ablation resistance performance.

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 a 3D printing reinforcement/Ti2AlNb base composite material and a preparation method thereof, and belongs to the field of metal material manufacturing. The preparation method comprises the following steps: (1) Ti2AlNb spherical prealloy powder is used as a basal body; and TiB2, graphene or TiC powder is used as reinforced particles; (2) the selected powder is mixed for mechanical stirring; (3) the pre-stirred powder is mixed through dry ball milling; (4) a three-dimensional pattern of a needed sample is designed by using a computer; and drawing procedures are input intoa 3D printer; and (5) the ball-milled mixed powder is scanned layer by layer according to preset procedures to finally prepare the needed composite material. The process is simple; all the componentsare excellent in stability; a reinforcing phase is tightly combined with the basal body, and a second phase generated in the laser melting process achieves a pinning effect in metal; and the reinforcing phase and the second phase are coacted to achieve a refined crystalline strengthening effect, so that the defects of the material after 3D printing can be eliminated. The composite material is small in average grain size, and prominently optimizes the hardness and the friction and wear performances of the material.

A method for forming a lubrication material using self-dispersed crumpled graphene balls as additives in a lubricant base fluid for friction and wear reduction. The lubricant base fluid may be, for example, a polyalphaolefin type-4 (PAO4) oil. After the crumpled graphene balls are added as additives in the lubricant base fluid, the lubricant base fluid with the additives are sonicated for a sonicating time period, so that the crumpled graphene balls are self-dispersed in the lubricant base fluid to improve friction and wear properties of the lubricant base fluid. In some cases, a dispersing agent, such as Triethoxysilane, may be added in the lubricant base fluid to enhance stability of dispersion of the crumpled graphene balls in the lubricant base fluid. The crumpled graphene balls may stay stably dispersed in the lubricant base fluid between a lower temperature (such as −15 ° C.) to a higher temperature (such as 90 ° C.).

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 discloses a water-based 2D/0D nanometer composite material lubricant, which is formed by mixing and stirring 0.02-2 wt% of 2D nanometer thin sheets, 0.02-2 wt% of 0D nanoparticles and 96-99.6 wt% of deionized water, wherein the 2D nanometer thin sheets are selected from one or a variety of 2D nanometer thin sheets containing C and O functional groups, the 0D nanoparticles are selected from one or a variety of metal oxide particles containing Al, Fe, Cu, Zr, Zn or Ti and O functional group, and the 2D nanometer thin sheets and the 0D nanoparticles form a 2D/0D nanometer compositematerial. According to the present invention, the synergistic effect is provided by combining the excellent characteristics of the 2D nanometer material and the 0D nanometer material, and the obtainedproduct has advantages of good stability, easy re-dispersion, low friction coefficient, good wear resistance and environmental friendliness, and can replace the traditional oil-based lubricant systemso as to achieve low energy consumption and prolonged service life of equipment.

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 discloses a sizing material for rotary sealing of megawatt-level fans, and belongs to the technical field of rubber seal. The prepared sizing material disclosed by the invention is prepared from ternary polymerization epichloro-hydrin rubber, millable polyether polyurethane rubber, a solid self-lubricant material and a hyperoxide curing system. The sizing material has the characteristics of good low temperature resistance, abrasive resistance, long-term weather aging resistance and self-lubricating property, is free of abrasion with a shaft, and is especially suitable for manufacturing of a rotary seal element of the fan capable of resisting a low temperature of -40 DEG C, or manufacturing of a fan sealing element of which the surface hardness of the rotating shaft is smaller than rockwell hardness (HRC)55, or manufacturing of an end face sealing element of the fan assembled in a drawing manner.

The invention discloses a melamine resin microcapsule lubricating oil and a lubricating oil coating material, and preparation methods thereof. The melamine resin microcapsule lubricating oil is prepared through the following steps: adding polyvinyl alcohol, sodium dodecyl benzene sulfonate and deionized water into a beaker, dissolving, then adding a lubricating oil, and stirring for emulsification; slowly pouring the emulsified lubricating oil into a melamine resin prepolymer in three times, controlling a stirring revolving speed, and emulsifying for 30 min, to obtain an emulsified lubricating oil; adjusting the pH value to 2-3 with hydrochloric acid, and carrying out a heating reaction for 3 hours in a 65 DEG C water bath; and carrying out suction filtration on the product, washing with water, drying for 24 h, and thus obtaining the melamine resin microcapsule lubricating oil. The invention also discloses the lubricating oil coating material prepared from the melamine resin microcapsule lubricating oil and the preparation method thereof. The coating material has the stability of solid lubricant materials, also has excellent lubricating performance of liquid oils, and can be widely applied in heavy-load and high-temperature mechanical friction parts required for aeronautics and astronautics, machinery, electronics, chemical industries, shipping and the like.

Small ceramic particles (e.g., of TiC) are incorporated into fibers. The ceramic particles enhance the friction and/or wear properties of a carbon-carbon composite article made with the impregnated or coated fibers. The impregnated fibers can be, e.g., polyacrylonitrile (PAN) fibers, pitch fibers, and other such fibers as are commonly employed in the manufacture of C—C friction materials. The impregnated fibers can be used to make woven, nonwoven, or random fiber preforms or in other known preform types. Preferred products are brake discs and other components of braking systems. The particles may be included in the fibers by mixing them with the resin employed to make the fibers and/or by applying them to the surfaces of the fibers in a binder.

The invention relates to a manufacturing method of brake disk arranged on the shaft, comprising batching, smelting, pouring, annealing treatment, after treatment or the like, the brake disk manufactured can meet the need of motor cars, locomotives and automobiles of 50km/h-160km/h, which has the advantages that the invention has great brake power and is applicable to the high-velocity or high-duty locomotives with better high-temperature mechanic property and heat fatigue durability, good frictional dissipation property, stable frictional factor and smooth braking with greatly improved processing performance of the structure.

The invention discloses microencapsulated lubricating oil. The microencapsulated lubricating oil is obtained through the following steps that lubricating oil and mixed emulsifiers are mixed evenly according to the mass ratio of 16:3; a part of a PVA water solution is poured into the mixture at the temperature ranging from 80 DEG C to 85 DEG C; the remaining PVA water solution is added into the mixture after the mixture is stirred for 10 minutes; the mixture is subjected to emulsification; NaCl is added into the mixture in the stirring process, the mixture is stirred for 30 minutes, and then an emulsion is obtained; an tetraethyl orthosilicate and acetic acid solution is slowly added into the emulsion and stirred for 3 hours at the temperature of 55 DEG C; initiating agents are added into the emulsion, the emulsion is heated for 5 hours at the temperature of 75 DEG C, subjected to centrifugal separation, washed and dried, and finally the microencapsulated lubricating oil is obtained. A lubricating oil coating material is excellent in performance and capable of being widely applied to high-load and high-temperature mechanical friction parts and components needing to be properly protected in aerospace, machinery, electronics, chemical industry, ships and other industrial sectors.