465results about How to "Improve tribological properties" patented technology

The invention relates to a surgical implant that provides an artificial diarthroidal-like joint, suitable for use in replacing any joint, but particularly suitable for use as an intervertebral disc endoprosthesis. The invention contains two rigid opposing shells, each having an outer surface adapted to engage the surfaces of the bones of a joint in such a way that the shells are immobilized by friction between their outer surfaces and the surfaces of the bone. These outer surfaces are sufficiently rough that large frictional forces strongly resist any slippage between the outer surface and the bone surfaces in the joint. They may be convex, and when inserted into a milled concavity, are immediately mechanically stable. Desirably, the outer surfaces of the shells are adapted to allow for bony ingrowth, which further stabilizes the shells in place. The inner surfaces of the shells are relatively smooth, and adapted to slide easily across a portion of the outer surface of a central body disposed between the shells. The central body has a shape that cooperates with the shape of the inner surface of the shell so as to provide a range of motion similar to that provided by a healthy joint. A flexible sheath extends between edges of the opposing shells. The inner surface of this sheath, together with the inner surfaces of the rigid shells, defines a cavity encasing the central body. At least a portion of this cavity is filled with a fluid lubricant, further decreasing the frictional force between inner surfaces of the shell and the surface of the central body.

A coating includes a first layer of a ceramic alloy and a second layer disposed on the first layer and including carbon. The coating has a hardness of from 10 to 20 GPa and a coefficient of friction of less than or equal to 0.12. A method of coating a substrate includes cleaning the substrate, forming the first layer on the substrate, and depositing the second layer onto the first layer to thereby coat the substrate.

The invention discloses a dry film lubricant based on modified epoxy resin and characterized by comprising the following components: 100 to 120 parts of epoxy resin, 1 to 5 parts of inorganic nano-particles, 0.1 to 0.5 part of coupling agent, 20 to 60 parts of lubricant, 10 to 20 parts of anti-wear agent, 1 to 4 parts of dispersing agent, 10 to 30 parts of absolute alcohol and 0 to 20 parts of deionized water. The method for preparing the dry film lubricant comprises the following steps: firstly, carrying out surface modification on the inorganic nano-particles by the coupling agent; then, adding the modified inorganic nano-particles to the epoxy resin to obtain the modified water-based epoxy resin nano-emulsion; adding the dispersing agent to the mixture of the lubricant and the anti-wear agent drop by drop; then, adding the mixture to the modified water-based epoxy resin nano-emulsion, and evenly mixing; and further adding the deionized water to adjust the viscosity of coatings, thus obtaining the dry film lubricant based on the modified epoxy resin. The invention has the advantages of low emission of organic volatile substances, good frictional properties, strength, toughness, weather resistance, corrosion resistance and other overall properties and simple preparation process.

The invention relates to a preparation method of a NiAl intermetallic base solid self-lubricating composite material containing Ti3SiC2 and C binary composite lubrication phase and wild phase TiC. The NiAl intermetallic base solid self-lubricating composite material is prepared from Ni powder, Al powder, Mo powder, Nb powder, Fe powder, B powder and Ti3SiC2 powder, wherein the molar ratio of Ni: Al: Mo: Nb: Fe: B=48: 50: 1: 1: 0.5: 0.02, and the addition quantity of the Ti3SiC2 powder is 5-20 weight percent of the total weight of the Ni powder, the Al powder, the Mo powder, the Nb powder, theFe powder and the B powder. The NiAl/ Ti3SiC2-C/TiC intermetallic base solid self-lubricating composite material synthesized by the method has novel component design (intermetallic matrix+ composite lubrication phase+ wild phase), high density, good tribological properties and stable technological parameters. The preparation process is fast and simple, and the method is easily operated and is suitable for preparing NiAl intermetallic base solid self-lubricating composite materials with high performance.

The invention belongs to the field of high polymer composites and particularly relates to a nanoparticle/graphene oxide composite modified high polymer material and a preparation method thereof. The composite is prepared from nanoparticle/graphene oxide composite particles and a macromolecular polymer matrix, wherein the nanoparticle/graphene oxide composite particles are synthesized with an electrostatic self-assembly method, that is, an amino modified nanoparticle dispersion liquid is ionized to have positive charges while graphene oxide contains a large quantity of carboxyls and hydroxyls and is ionized to have negative charges, particles with positive and negative charges are sufficiently contacted, and electrostatically self-assembled nanoparticle and graphene oxide composite particles are obtained. The prepared nanoparticle/graphene oxide composite modified high polymer material has excellent mechanical and tribological performance, is simple and efficient to prepare and has goodapplication prospects in automobiles, aerospace, electronic and electrical engineering, machinery, weapons and other fields.

The present invention is the preparation process of one kind of superthin polymer film. Filming material is first synthesized via free radical copolymerization and superthin polymer film with different surface property is then prepared by means of self-assembling technological process. The process is simple and the prepared superthin polymer film has friction reducing and wear resisting effect and may be used in the lubrication and protection of mini electromechanical system.

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 discloses a wear-resistant self-lubricating nylon compound material and a method for preparing the same, and belongs to the technical field of macromolecular materials. The wear-resistant self-lubricating nylon compound material comprises the following raw materials in part by weight: 100 parts of nylon, 10 to 30 parts of carbon fiber, 5 to 15 parts of polyethylene, 2 to 4 parts of compatilizer, 0.5 to 3 parts of irradiation sensitizer, 0.1 to 0.3 part of antioxidant and 5 to 15 parts of polytetrafluoroethylene. The preparation method comprises the following steps: irradiation pretreatment of carbon fibers and polyethylene, preparation of nylon/polytetrafluoroethylene/carbon fiber compound materials, irradiation crosslinking modification of nylon/polytetrafluoroethylene/carbon fiber compound materials and the like. The wear-resistant self-lubricating nylon compound material possesses excellent wear-resistant property, self-lubricating property and physical mechanical property and high size stability and heat resistance, and can be widely applied in fields of self-lubricating bearings, shaft sleeves, mechanical cams, gears, sucker rod couplings, oil-free lubricating materials and the like.

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 relates to a preparation method of polyurethane plasticizing monomer casting nylon compound material. The material is made through pouring the raw material of polyurethane prepolymer, and caprolactam, etc. The main performance of the material is characterized in that the mechanical strength is improved, the tensile fracture elongation rate is increased along with increasing of the use amount of the polyurethane prepolymer, the impact strength is enhanced along with the increasing of the use amount of the polyurethane prepolymer, and the tribology performance and the antistatic performance are improved remarkably.

The present invention is related to an apparatus for the production of inorganic fullerene-like (IF) nanoparticles and nanotubes. The apparatus comprises a chemical reactor, and is further associated with a feeding set up and with a temperature control means for controlling the temperature along the reaction path inside the reactor so as to maintain the temperature to be substantially constant. The invention is further directed to a method for the synthesis of IF-WO3 nanoparticles having spherical shape and having a size up to 0.5 mu m and nanotubes having a length of up to several hundred mu m and a cross-sectional dimension of up to 200 nanometer.

A kind of self-lubricating nickel chromium alloy group compound material with wide temperature band and the preparation method of it. The components and the mass percent of them are: Ni: 36.8-57.6%, Cr: 9.2-14.4%, Mo: 9.0-15.0%, Al: 2.0- 6.0%, Ti: 3.0-8.0%, B: 0.08%, MoS2: 6.0-15.0%, rare-earth compound: 2.0-8.0%. The preparation method contain the following steps: The powders of the above components according to the above mass percent will be uniformly mixed in ball crusher or mortar. The powders uniformly mixed will be chill pressed to mould and then will be put into the graphite mould to be hot pressed to mould in a vacuum thermocompressor. The process is as following: firstly, to be vacuumized to 2X10-5-8X10-5Pa, and to inflate N2 to protect them, and then the temperature will be increased to 1200-1280deg.C, a positive pressure 12-16MPa will be added when the temperature has got, to preservate the temperature and the press for 20-30min. From normal temperature to 700deg.C, the patent own lots of advantages, such as the mechanical strength of it is high, the oxidation resistance is high. The tribology ability of it is well, and it can be used to resolve the running problem of all kinds of hot engine and other high temperature machine and the lubricating problem of packing parts in wide temperature band range.

The invention discloses a method for preparing an ultra-lubricating compound carbon film material on base metal. The method is characterized in that: a silicon transition layer is formed on a metallicsubstrate by the unbalanced magnetic control sputtering method, and the hydrogen containing carbon film material is prepared by a pulse biasing voltage assistant radio frequency inductively coupled plasma chemical vapor deposition method. The film material can be firmly bonded to the metallic substrate and shows extremely excellent tribological property with a frictional coefficient of 0.03 to 0.05 and a wear rate of 1.73 to 2.6*10<-7>mm<3>/Nm in the atmospheric environment and a frictional coefficient of 0.004 to 0.007 and a wear rate of 3.8 to 8.9*10<-9>mm<3>/Nm in an atmosphere of inert gas such as N2 and the like. Therefore, the problem of the poor bonding force between the carbon film material and the metallic substrate is solved, and the carbon film material of the invention has a wide application prospect in various fields such as high tech precision machinery, electric information technology and the like.

The invention discloses a preparation method of a cadmium-doped molybdenum disulfide nano lubricating additive, which is characterized by comprising the following steps: (1) dissolving (NH4)2MO4, Na2S, a reducer and a soluble cadmium salt in deionized water to obtain a mixture solution for later use; (2) transferring the solution obtained in the step (1) into a stainless steel reaction kettle, sealing, reacting at 130-260 DEG C for 24 hours, and cooling to room temperature to obtain the reaction product; and (3) separating the reaction product, washing, and drying to obtain the flower-structure Cd-doped MoS2 nanosheets assembled from nanosheets. The method has the advantages of simple technique and low cost; and the prepared product has the advantages of high purity, high yield, high specific area and favorable tribological performance.

The invention relates to a preparation method of carbon cloth with the nanoparticle modified surface. The method comprises the steps of putting carbon cloth into an acetone solution, saturating, and drying the carbon cloth after the saturating in the air to obtain a sample A; putting the sample A and concentrated nitric acid into a hydrothermal reaction kettle; putting the hydrothermal reaction kettle into a homogeneous reactor for oxidization, cleaning the taken carbon cloth, and finally carrying out vacuum drying to obtain a sample B; putting the sample B and a silica sol solution into a reaction kettle, and carrying out reaction in a microwave hydrothermal reaction instrument; cooling a reaction system to the room temperature, and washing the sample B taken from the reaction system; finally, carrying out the vacuum drying to obtain the carbon cloth with the nanoparticle modified surface. According to the method, SiO2 nanoparticles can be evenly deposited on the surface of the carbon cloth efficiently; the prepared carbon cloth with the nanoparticle modified surface is high in surface oxygen content; the uniformity of a reticular polymer formed by a linear polymer through cross-linking action in the sulfidation process can be improved; and therefore, the carbon cloth has the superior self-lubricating property, mechanical strength and tribological property.

The invention discloses a reinforced poly-ether-ether-ketone composite material with nano SiO2 chemically grafted to the surfaces of carbon fibers and a preparation method of material. The composite material is prepared from, by weight, 65-100 parts of poly-ether-ether-ketone, 5-30 parts of the carbon fibers, 0-10 parts of the nano SiO2, 0.5-3 parts of gamma-aminopropyl triethoxysilane and 0.5-3 parts of gamma-glycidyl ether oxypropyl trimethoxysilane. According to the composite material, modified carbon fibers are obtained by chemically grafting the nano SiO2 to the surfaces of the carbon fibers, so that the interface bonding performance between the carbon fibers and matrix resin is improved. Meanwhile, the modified carbon fibers are added into PEEK matrix as a reinforcing filler to improve the mechanical performance and wear resistance of PEEK and reduce the friction coefficient and wear rate of the material so that the modified-carbon-fiber-reinforced PEEK-based composite material can be applicable to extreme working conditions such as high speed, heavy loads and oil-free lubrication.

The invention provides a non-sulfur and non-phosphorus organic molybdenum compound and preparation method and application thereof. The structural formula is shown in the formula, wherein R is a C1-C30 linear or branched alkyl or cycloalkyl. The preparation method comprises the step of reacting hydroxyalkyl amine with ammonium molybdate tetrahydrate in the presence of an organic solvent and a catalyst. The organic molybdenum compound provided by the present invention can be used as a lubricating oil additive and has good antiwear and extreme-pressure properties.

The invention relates to a method and a device for preparing a film coating micronano texture and belongs to a film coating of surface engineering. The preparation method comprises the steps of preparing at early stage, depositing the film coating, preparing the micronano texture and performing aftertreatment. The special device is a multi-beam pulse laser micronano texture processing system device. The multi-beam pulse laser micronano texture processing system device comprises a pulse laser module, an optical path transmission module and a precise scanning module which are connected with one another sequentially. The invention has the advantages that: the method and the device are convenient in processing and high in efficiency; preparation for the film coating deposition micronano texture on the surface of a material is realized by one laser source; the process is simple, and easy to control; the prepared samples are not subjected to a complex posttreatment process; the application range is wide; ultraviolet pulse laser has the characteristics of large photon energy and short wavelength and can perform precise micronano texture treatment on any materials; chemical reaction of various gases can be induced; and film coating deposition can be performed efficiently.

The invention discloses a method for preparing a metallic contamination adamantine surface ionic liquid lubricant self-assembly lubricative film. The method takes ionic liquid lubricant as raw material, adopts magnetron sputtering equipment to prepare a metallic contamination adamantine carbon film and assembles the liquid lubricant film which is stable, uniform and ordered on the carbon film. The method is characterized in that the preparation process is operated at normal temperature, and the requirements for the material and the shape of a substrate are lower; the film is stable and uniform, and has lower surface roughness; the film also has good performances on antifriction, wear resistance and adhesion resistance. The test of friction and wear proves that the ionic liquid lubricant and adamantine has good combining performance and better performances on antifriction, wear resistance and adhesion resistance, so that the lubricative film is expected to become the effective means of solving the problems of protecting and lubricating materials I the technical fields such as space machinery, information technology, etc.