361results about How to "Reduce coefficient of friction" patented technology

The invention relates to improved means for preventing eversion and subsequent obstruction of thin-walled, floppy gastrointestinal liners implanted in the digestive tract of an animal. The implantable devices include an anchor adapted for attachment within a natural body lumen and a thin-walled, floppy sleeve open at both ends and defining a lumen therebetween. A substantial length of the sleeve has material characteristics that result in the sleeve being prone to eversion in the presence of retrograde pressures. Exemplary eversion-resistant features provide an increased stiffness and/or an increased friction coefficient between the anchor and the proximal end of the sleeve to resist eversion. In some embodiments, the eversion-resistant feature includes an anti-buckling element, such as a wire coupled along the substantial length of the sleeve.

The invention relates to a polypropylene combination with anti-scoring property. The polypropylene combination is characterized in that the invention consists of the following raw materials by weight part: 40 to 100 parts of polypropylene, 0.5 to 5 parts of maleic anhydride or glyceryl methacrylate copolymer or graft Alpha- olefin copolymer, 0.2 to 2 parts of aliphatics acid amide, 0 to 40 parts of mineral filler, 0 to 20 parts of toughening agent, 0.1 to 1 part of antioxidant agent, and 0.1 to 1 part of retardant agent. The polypropylene combination of the invention is provided with good aging-resistant, flame retardant and anti-scoring properties, and is used for vehicle inner decorating pieces, home appliances shells, etc.

A catheter cleaner comprising a head, rod, and a handle is provided. The head, rod and handle may be fixedly attached to each other such that manipulation of the handle may also control movement of the head, both in the linear direction as well as a rotational movement. The head may define a tip and cutting edges. The tip may have a curved configuration which may be operative to assist in the insertion of the cleaner into and indwelling catheter and, the cutting edges may be operative to dislodge debris from an inside wall of the indwelling catheter. Moreover, the tip may be used to push against debris lodged or attached to the inside wall of the indwelling catheter to dislodge the same.

A hydrogel-metal assembly is provided. An intervening polymer network is used to bond together a water-swollen hydrogel layer and a biocompatible surface-modified metallic layer. The hydrogel layer is a water-swollen hydrogel layer of at least two interpenetrating polymers. The surface of the biocompatible surface-modified metallic layer is surface-modified with an inorganic material. The intervening polymer network has been chemically grafted to the inorganic material of the biocompatible surface-modified metallic layer through bi-functional linker molecules. The intervening polymer network is further physically or chemically cross-linked with the polymers of the water-swollen hydrogel. The hydrogel-metal assembly can be adapted to form a medical device, medical implant, an artificial implant, an orthopedic implant, or at least as part of a joint. The hydrogel-metal assembly is attractive for use as such implants or devices due to its characteristics such as, for example, low coefficient of friction, impact-absorption capacity or strength, and/or biocompatibility.

The invention discloses a lubricating and cooling method for cutting process and a device thereof. The method comprises the following steps: adding nano-particles with particle size of 20-40 nm at a volume ratio of 1-5% into vegetable oil or deionized water; adding dispersant at a volume ratio of 0.05-0.15% while conducting ultrasonic vibration at a frequency of 10-40 kHz so as to obtain uniform oil-based or water-based nano-particle suspension with high dispersibility; and under the effect of compressed air with pressure of 0.3-1 MPa, sufficiently atomizing the nano-particle suspension into atomized particles with micron-level diameter, wherein the high-pressure atomized particles break through a cutter through a nozzle and an air barrier layer on the workpiece surface and then are ejected to a cutting area so as to lubricate and cool the cutting area. Through the lubricating and cooling method for cutting process and the device thereof which are disclosed by the invention, the cooling medium with high lubricating performance and heat conducting performance can be effectively injected into the cutting area so as to improve the lubricating state of the cutting area and reduce friction and heat emission; and the generated heat is taking away in real time.

The invention discloses a method for preparing a composite anti-friction and anti-wear additive of graphene-loaded nanoparticles. The method comprises the following steps: carrying out ultrasonic dispersion on expanded graphite, nanoparticles and a solvent in an ultrasonic emulsification disperser to obtain an evenly mixed dispersion system A; putting the dispersion system A into an ultrasonic cell crusher to carry out ultrasonic stripping treatment, stripping the expanded graphite into multi-layer graphene sheets by ultrasonic action, and loading the multi-layer graphene sheets and the nanoparticles to obtain a dispersion system B after ultrasonic stripping is ended; standing and separating the dispersion system B, taking out a black troubled liquor at the lower part to carry out high-speed centrifugal separation, and washing the separated solid into neutral property, so as to obtain a solid C; putting the solid C into a vacuum drying oven to dry, so as to obtain the composite anti-friction and anti-wear additive of the graphene-loaded nanoparticles. The method disclosed by the invention is simple and convenient, simple in process, strong in controllability, and applicable to industrial production; the prepared composite anti-friction and anti-wear additive has the characteristics of good stability, low friction coefficient, excellent abrasion resistance and the like, and has a broad application prospect in the field of frictional wear.

This invention relates to improved lubrication in drilling and completion fluids used in subterrain drilling for oil and gas. The addition of zinc dialkyl dithiophosphate (ZDDP) acts as a lubricant, an enhancer to other lubricants and rate of penetration enhancer.

The invention discloses a reciprocal high-temperature high-load friction and abrasion test method and equipment in the friction and abrasion testing technique domain, which is characterized by the following: the reciprocal moving structure, lower sample bottom support structure and upper sample vertical location structure adapt standard rolling bearing to realize the dynamic part measurement of friction coefficient, which improves the accuracy greatly; the load is constructed precisely to exclude the interference of sample moving structure friction force by static friction; the standard bearing improves the bearing ability, whose maximum load of nominal construction reaches 10000N to reduce the quality of moving structure and reciprocal inertia force and make the system operate stably at 800r/min; because of the orientation heating and thermal action of sample, the sample gains higher temperature and the bottom temperature remains low; the rolling shaft supports the bottom of sample bearing floor to keep enough space for cooling and lubricating through lubrication oil.

A cleaning blade member comprises a polymer substrate and an outermost layer consisting essentially of a non-particulate, non-elastomeric ceramer or fluoroceramer and nanosized inorganic particles that are distributed within the non-particulate ceramer or fluoroceramer in an amount of at least 5 weight % and up to and including 50 weight % of the outermost surface layer. These cleaning blade members can be used to advantage in apparatus for providing electrophotographic or electrostatographic images.

[Object] To provide a nanoparticle-containing lubricating oil composition which demonstrates a low friction coefficient and realizes a further fuel economy.

[Solving Means] A nanoparticle-containing lubricating oil composition comprising a base oil, an additive having hydroxyl group, and nanoparticle. A nanoparticle-containing lubricating oil composition comprising a base oil, an ashless friction modifier having hydroxyl group, and nanoparticle. A nanoparticle-containing lubricating oil composition comprising a base oil, an additive having hydroxyl group, and nanoparticle having a particle diameter of 1 to 100 nm. A nanoparticle-containing lubricating oil composition comprising a base oil, an ashless friction modifier having hydroxyl group, and nanoparticle having a particle diameter of 1 to 100 nm.

The invention relates to cermet containing a Ni-Cr binding agent, belonging to cermet material and aiming at leading the high temperature oxidation resistance of the cermet to be improved. The cermet is made by that TiC, TiN, WC, Mo, Cr3C2, Ni, Cr and powdered graphite are conducted with ball milling mixing, press molding, vacuum degreasing and vacuum sintering; the weight percentage of the compositions are as follows: Ti is more than or equal to 33 and less than or equal to 49, W is more than or equal to 4 and less than or equal to 9, Mo is more than or equal to 11 and less than or equal to 17, Ni is more than or equal to 12 and less than or equal to 34, Cr is more than or equal to 4 and less than or equal to 10.5, C is more than or equal to 7.5 and less than or equal to 11, and N is more than or equal to 2 and less than or equal to 3. The method of the invention comprises the following steps of ball milling mixing, press molding, vacuum degreasing and vacuum sintering. The cermet has good rigidity, red hardness, wear resistance, oxidation resistance, thermal shock resistance and adhesive resistance in hot environment as well as low friction coefficient, and can be used for manufacturing high-speed high-efficiency cutting tools, copper profile hot extrusion dies and parts with heat resistance, corrosion resistance and wear resistance.

The invention discloses a V-Al-N hard coating with a nano composite structure. The V-Al-N hard coating comprises the following component: (V1-xAlx) N, wherein 1-x is between 0.41 and 0.6, and x is between 0.4 and 0.59. The V-Al-N hard coating ensures lower friction coefficients and higher hardness and is particularly suitable for being used as cutter coatings. The invention also discloses a preparation method for the V-Al-N hard coating with the nano composite structure. The preparation method comprises the following steps of: cleaning a matrix; and depositing the coating: assembling an Al target on an intermediate-frequency cathode in a vacuum chamber, assembling a V target on a direct current (DC) cathode, inputting Ar gas and N2 gas, and sputtering the matrix to deposit the V-Al-N hard coating with the nano composite structure under the conditions of 250 DEG C to 500 DEG C and 0.3 Pa to 1.0 Pa by regulating the power of the Al target and the power of the V target. The V-Al-N hard coating and the preparation method thereof have the advantages of high maneuverability, high controllability, easy industrialized production and higher economic benefit.

The invention relates to a TiZrAlSiON nano composite superhard coating cutter and a preparation method thereof, belonging to the technical field of thin-film materials. The coating cutter comprises a hard alloy cutter body, wherein a TiZrAlSiON nano composite coating is plated on the cutter body; the TiZrAlSiON coating comprises a 50-100nm-thick metal base layer-Zr metal layer, a 100-200nm-thick nitride transition layer ZrN and a 1000-4000nm-thick functional layer TiZrAlSiON; and the nano composite coating has a nano composite structure in which nanocrystal particles are embedded in the amorphous matrix, the nanoparticles comprise TiN and ZrN, and the amorphous matrix comprises Al2O3 and Si3N4. The preparation method comprises the following steps: carrying out glow cleaning on the hard alloy cutter, carrying out arc ion bombardment, and sequentially depositing the base metal layer, transition metal nitride layer and TiZrAlSiON coating. The TiZrAlSiON composite coating has the advantages of high hardness, low friction factor, high toughness, high binding force and excellent high-temperature oxidation resistance, has better comprehensive properties than the TiN, CrN and Ti-Al-N coatings which are industrially produced at present, and can effectively enhance the toughness and cutting characteristic of the cutting tool and prolong the service life of the hard alloy cutter body.

Oxygen barrier films having a greatly improved dynamic coefficient of friction, and specifically, oxygen barrier films having an exceptionally low dynamic coefficient of friction, reduced moisture sensitivity and good oxygen barrier properties over a wide range of relative humidities. The low coefficient of friction is obtained by using film layers which are blends of a polyamide component and a high density polyethylene which surround an oxygen barrier layer, such as an ethylene vinyl alcohol layer.

The invention discloses a dry friction self-lubricating sliding bearing which is obtained by rolling three layers of composite materials. The three layers of composite materials comprise a metal substrate; a spherical porous copper powder layer which is sintered on one surface of the metal substrate; and an anti-friction wear resistant material layer which permeates and covers the copper powder layer, wherein, the copper powder layer consists of the following components by weight percentages: 8% of tin powder, 3% of zinc powder and copper powder; the anti-friction wear resistant material layer consists of the following components by weight percentages: 40-60% of polytetrafluoroethylene, 10-15% of polyimide, 3-6% of molybdenum disulfide and tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA). The dry friction self-lubricating sliding bearing has the advantages of small initial friction coefficient, less heat production, easy formation of a transfer membrane, minimal damage to a grinding shaft and the like; meanwhile, the application of the bearing can be expanded to fields of food, pharmacy, beverage, hydrotechnics, medical machinery and the like as manufacturing raw materials do not contain hazardous substances such as lead, toluene and the like.

The invention discloses a method for enhancing the wearability in the cylinder of engine and the inner surface of the cylinder cover. The steps are: 1) carries on consolidating treagment to the surface of cylinder and the inner surface of the cover within section between the two stop points of valve; 2) uses laser etching method to etch tiny slots on the cylinder and the inner surface of the cover regularly; 3) grinds the cylinder and the surface of the cover subtly in order to eliminate the remnants around the slots. In the invention, the cylinder and the surface of the cover has high rigidity and oil storing slots, the friction factor is decreased greatly.

An electric contact, in particular an electric contact of a plug-in connector, has a metallic substrate to which a contact layer is applied. The contact layer is arranged as a structured layer.

The invention provides a self-lubricating high-wear resistance oil seal and a production method thereof. The self-lubricating high-wear resistance oil seal is characterized by being prepared from 60-80 parts by weight of fluorous rubber, 20-40 parts by weight of polytetrafluoroethylene, 1.5-2.5 parts by weight of p-phenylenediamine aging resister, 1.5-2.5 parts by weight of dihyaroquinoline aging resister, 3-6 parts by weight of physical aging resister, 5-10 parts by weight of plasticizing agent, 35-48 parts by weight of strengthening agent, 2-6 parts by weight of slipping agent, 2-4 parts of dispersion agent, 1.5-2.5 parts by weight of vulcanizing agent, 5-8 parts by weight of activating agent, 1-2 parts by weight of stearic acid and 1.6-2.0 parts by weight of accelerating agent. The self-lubricating high-wear resistance oil seal obtained by the invention can be adapted to the high speed of an engine and a crankshaft, has the advantages of high wear resistance, small friction coefficient, high-low temperature resistance, weather resistance, favorable heat resistance and long service life and ensures that the oil seal does not leak oil when an automobile is driven for at least 0.3 million kilometer.

The invention provides a nickel bronze-steel compound double metal bearing material and a manufacture method thereof, in particular to a nickel bronze-steel compound double metal bearing material and a manufacture method thereof of a nickel bronze alloy sintered on the surface of a low carbon high grade plain carbon steel material. The nickel bronze-steel compound double metal bearing material of the invention is a layered structure; a basic layer is the low carbon high grade plain carbon steel material; a surface layer is the nickel bronze alloy; the nickel bronze alloy is sintered on the surface of the low carbon high grade plain carbon steel material. The manufacture method of the nickel bronze-steel compound double metal bearing material of the invention relates to a manufacture method for sintering the nickel bronze alloy on the surface of the low carbon high grade plain carbon steel material to form the nickel bronze-steel compound double metal bearing material by adopting the principle of a powder metallurgy sintering method.

The invention relates to a noise reduction PC/ABS (polycarbonate/acrylonitrile-butadiene-styrene) alloy material and a preparation method thereof. The alloy material comprises, by weight, 40-75 parts of polycarbonate resin, 15-55 parts of acrylonitrile-styrene-butadiene copolymer resin, 5-20 parts of high damping silicone rubber, 0.1-1 part of antioxidants and 0.1-1 part of lubricants. Raw materials are added into a mixer and mixed, obtained mixture is fed into a double-screw extruder through a weightless feeder and blended and granulated by the double-screw extruder to obtain the noise reduction PC/ABS alloy material. By the aid of the high damping silicone rubber, viscoelastic characteristics of PC/ABS alloys are improved, internal friction of macromolecular segments is caused by mechanical energy of noise when plastic products have noise risks, so that the mechanical energy is converted into heat energy to be dissipated, the noise risks of the plastic products are reduced, and noise can be reduced. Besides, the impact toughness of the PC/ABS alloys is improved by the high damping silicone rubber serving as a toughening agent.

The invention discloses an amorphous carbon complex coating which consists of a pure titanium base, a carbon-titanium transition layer and titanium contained amorphous carbon top layer sequentially deposited on a matrix, wherein the titanium contained amorphous carbon top layer comprises amorphous carbon with atomic percent content of 90-95% and 5-10% of titanium, the amorphous carbon comprises two types such as sp2 and sp3, and the amorphous carbon atomic percent of sp3 type in the titanium contained amorphous carbon top layer is increased to 40%-50% from 20%-30%. The invention also discloses a preparation method for the amorphous carbon complex coating, and a closed field nonequilibrium magnetron sputtering is adopted, thus being beneficial to continuous chemical industry production. The amorphous carbon complex coating has the advantages of high hardness, low stress, larger thickness, low friction coefficient, excellent abrasive resistance and the like, thus being used not only in tribology field, but also in biomedicine, such as artificial hip joint, so that the service life of the material is greatly prolonged, and the amorphous carbon complex coating has wide application prospect.

The invention embraces polymer resins, such as polyethylene terephthalate resin, that includes surface-compatibilized alumina. The invention also embraces methods of making polyethylene terephthalate resins that are capable of being formed into low-haze, high-clarity articles possessing reduced coefficient of friction.

The invention discloses a basalt fiber filled ultrahigh molecular weight polyethylene composite material and a preparation method thereof, and belongs to a polymer composite material and a preparation method thereof. The material consists of the following components in percentage by mass: 65 to 95 percent of ultrahigh molecular weight polyethylene, 5 to 35 percent of basalt fibers and 0 to 2 percent of coupling agent. The preparation method comprises the following steps of: mixing the ultrahigh molecular weight polyethylene, the basalt fibers and the coupling agent to form a uniform mixture; and performing hot press molding, namely preserving the heat for 1 to 2 hours at the temperature of between 180 and 220 DEG C, pressing the mixture for 20 to 60 minutes under the pressure of 10 to 30MPa, and finally cooling the pressured mixture to room temperature to prepare the basalt fiber filled ultrahigh molecular weight polyethylene composite material. The modified material has good abrasionresistance and self-lubricating performance and high compressive strength, hardness and creep deformation resistance.

The present invention discloses a composition of a knee implant comprising biomaterials such as combination of Ti—Nb—Zr alloy and tantalum to support osseointegration. The present invention further discloses a method of manufacturing customized patient-specific knee implant using 3D printing technology to suit the patient. The method involves the use of high energy source such as fiber laser or electron-beam. The base plate is mounted on the CNC. The energy source creates a melt pool on the base plate and the energy source is fed with a biomaterial in the form of wire or powder. The biomaterial is deposited on the base plate layer by layer, which solidifies in the melt pool of the base plate. The knee implant thus fabricated suits the elastic modulus of the bone and is useful as customized implant in patient undergoing replacement surgery.

A device, in particular a cover panel for a display device or a monitor auxiliary panel or a surface for input devices, includes a substrate and a coating applied onto the substrate. The coating has a surface having a coefficient of friction in the range between approximately 0.01 and 0.12, in particular between approximately 0.02 and 0.1, or between approximately 0.03 and 0.09.

The invention relates to a technical device for reducing negative frictional resistance on a driven cast-in-place pile, and an application method thereof. The device is characterized in that a dual-layer steel sleeve is arranged outside of a pile mould, the inner sleeve and the outer sleeve are connected by using a holder and are fixed below a vibratory hammer, and a cylindrical dual-layer plastic thin film is arranged between the inner sleeve and the outer sleeve and is fixed on an annular prefabricated concrete block by using a buckle arranged on ends of the thin film, wherein the annular prefabricated concrete block is arranged on the lower portion of the dual-layer steel sleeve. According to the invention, the dual-layer steel sleeve along with the plastic thin film within the dual-layer steel sleeve and the annular prefabricated block is sunk to a predesigned depth in static pressure or vibration manner, the steel sleeve is pulled out of the ground after concrete poured by the driven cast-in-place pile has a certain strength, while the dual-layer plastic thin film and the annular prefabricated block are left in the foundation, so that frictional factor of a pile-soil interface above the neutral point of the pile body is reduced, damages caused by the negative frictional resistance on the pile foundation are eliminated, bearing capacity of the pile foundation is improved, at the same time forming quality on the upper portion of the pile body is controlled. The device has a convenient implementation, low cost, and good pile-forming assistance effect.

A coated composite nano-class pseudo-diamond layer is prepared through glow washing to the surface of workpiece, sequentially depositing the transition metal layer with 100-200 nm in thickness, the transition metal-pseudodiamond mixture layer with 50-200 nm in thickness and the transition metal doped nano-class pseudodiamond layer with 500-3000 nm in thickness. Its advantages are high hardness and adhesion and low friction coefficient.

The invention relates to a carbon fiber reinforced polymer-based self-lubricating material and a preparation method thereof. The composition and mass fraction of the material are: polyimide of 30-50 percent, chopped carbon fiber of 10-20 percent, molybdenum disulfide of 10-40 percent and antimony trioxide of 10-30 percent. The invention has the advantages of high mechanical strength, low friction coefficient, low wear rate and the like, and can be processed to be used as a sliding vane, a bearing and the like. Moreover, the invention improves the friction reducing capability and the wear resistance of the material, and prolongs the service life of the material.

An optical element is provided that includes a substrate that is transparent in the visible spectral region and a multilayer anti-reflection coating on the substrate. The coating has alternating layers of layers having a first refractive index and of layers having a second, higher refractive index. The layers having the higher refractive index contain nitride or oxynitride and the layers having the first refractive index contain oxide of silicon and of at least one other element. The molar fraction of silicon in the layers having the first refractive index is predominant when compared to the molar fraction(s) of the other element or elements. The uppermost layer of the coating is a layer having the first refractive index. A layer of chain-form organofluoro molecules is disposed on the coating, wherein the molecules are bonded at the ends to the surface of the optical element.

A refrigerating machine oil composition comprising at least one ester additive selected from tetraesters of pentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms and hexaesters of dipentaerythritol and one selected from fatty acids having 5 to 18 carbon atoms, and a base oil that is an ester other than the ester additive, in which the content of the ester additive is 2 to 20 mass % based on the total amount of the refrigerating machine oil composition, and the kinematic viscosity of the refrigerating machine oil composition at 40° C. is 3 to 500 mm²/s.