1294results about "Molybdenum sulfides" patented technology

The invention provides a lubricating composition containing an oil of lubricating viscosity, an oil soluble molybdenum compound, and an ashless antiwear agent. The invention further provides for a new antioxidant. The lubricating composition is suitable for lubricating an internal combustion engine.

PCT No. PCT/JP95/02034 Sec. 371 Date May 23, 1997 Sec. 102(e) Date May 23, 1997 PCT Filed Oct. 4, 1995 PCT Pub. No. WO96/10710 PCT Pub. Date Apr. 11, 1996An object of the present invention is to provide galling resistance to a threaded joint used for an oil well pipe. On a thread portion and a metallic sealing portion of the joint, there is provided a manganese phosphate chemical formation coating layer, or alternatively there are provided a nitriding layer of 1 to 20 mu m thickness and a manganese phosphate chemical formation coating layer of 5 to 30 mu m thickness, and also there is coated a solid lubricant which contains powder of molybdenum disulfide or tungsten disulfide and also contains one of epoxy resin, furan resin and polyamide resin as an essential component, and a ratio of composition is maintained at a specific value, so that a solid lubricant coating layer of 10 to 45 mu m thickness can be formed by heating. Due to the above surface treatment, even when the frequency of repetition of fastening and unfastening of the joint is increased, the occurrence of galling can be prevented over a long period of time.

An engine lubricant formulated as a complete crankcase motor oil or additive concentrate composed of a combination of chemical constituents including a base oil selected from a synthetic oil, a mineral oil or semi-synthetic base oil (hydrogenated oil) or combination thereof, an oil soluble molybdenum additive, a dispersant inhibitor containing zinc dithiophosphate, and viscosity index improvers and one or more seal swelling agents to lubricate the engine and recondition the seals of new and/or high mileage engines. Addition of a polyalphaolefin and/or one or more esters such as a diester or polyolester may also be utilized therein. The lubricant may be formulated as a complete engine oil crankcase lubricant, or concentrated into an additive for addition to conventional mineral oil based engine oil, synthetic engine oils, or blends thereof in an effective amount of up to 30 percent volume percent, typically from 20 to 25 percent by volume.

The invention discloses a sulfide coated particle as well as a preparation method and an application thereof. The sulfide coated particle comprises a core and a shell coating the core, wherein the core is prepared from at least one of metal, oxide, metal hydroxide, metal inorganic salt, elemental carbon or oxysome thereof, carbide, nitride, semiconductor and organic matter; the shell is prepared from metal sulfide. The to-be-coated core is mixed with the metal salt, a reducing agent and a sulfur source with a liquid phase method, metal sulfide is precipitated to the particle surface through in-situ reduction, and uniform, continuous and controllable coating of the core surface with metal sulfide is realized. The coating method is simple, reaction conditions are mild, universality is high,a coating layer is controllable in thickness, complete and uniform, and the sulfide coated particle has quite broad practical application prospect in the fields of electrocatalysis, lithium ion batteries, biomedicine and the like.

The invention discloses a molybdenum disulfide (MoS2) nano-sheet film material and its preparation methods. The film material is characterized in that MoS2 nano-sheets vertically and sequentially grow on a conductive substrate, and the diameters and the thicknesses of the MoS2 nano-sheets are 0.05-2mum and 2-30nm respectively. There are two preparation methods of the film material. One preparation method comprises the following steps: a substrate which can be a copper sheet, a silver sheet, a titanium sheet, a tungsten sheet, a molybdenum sheet or carbon is placed in a solution comprising a molybdate and sulfur-containing compounds (comprising thiourea, thioacetamide and L-cysteine); and the sulfur-containing compounds undergo a hydrothermal reaction to grow the compactly-grown and uniformly-sequential MoS2 nano-sheet films on the substrate. Another method comprises the following steps: the molybdenum sheet is directly placed in a solution of the sulfur-containing compounds (comprising thiourea, thioacetamide and L-cysteine); and the sulfur-containing compounds undergo a sulfuration reaction under a hydrothermal condition to form the compact and uniform MoS2 nano-sheet ordered films. The film has a low hydrogen evolution overpotential (-30mv), a small Tafel slope (52mV/dec) and a high electrochemical stability, and is a hydrogen evolution electrode material extremely having an application prospect.

A method of making a thermal spray powder is provided. The method comprises: providing a powder comprising a plurality of porous particles; infiltrating a mixture comprising a solvent and a plurality of solid lubricant particles into the porous particles; and heating the powder to a temperature sufficient to evaporate the solvent. The method of forming a wear-resistant coating is provided. The method comprises: providing a thermal spray powder; heating the thermal spray powder; and accelerating the thermal spray powder from a thermal spray gun onto the substrate, to form a deposit. Yet another embodiment provides a wear resistant coating. The wear resistant coating is formed by thermally spraying the thermal spray powder.

A method of making a nanoparticulate based lubricant is disclosed. The method includes providing solid lubricant material with particles having a size less than or equal to about 500 nanometers, and treating the particles to create composite nanoparticles. The composite nanoparticles includes the solid lubricant material and at least a second material.

The invention discloses a hydrothermal synthesis method of molybdenum disulfide nano flowers. The hydrothermal synthesis method mainly comprises the following steps: adding an inorganic molybdenum source, an organic sulfur source and a proper amount of reducing agent into deionized water, uniformly mixing the ingredients, transferring the mixture into a high pressure reaction kettle, and then heating the mixture at a high temperature for 24 hours; washing and centrifugally separating the obtained solution for multiple times, and finally drying the solution to obtain black solid powder, namely, the molybdenum disulfide nano flowers. The hydrothermal synthesis method disclosed by the invention has the beneficial effects that the whole reaction and drying process is carried out in a sealed environment to avoid direct air exposure so as to ensure the product purity; since the reducing agent adopted by the hydrothermal synthesis method disclosed by the invention can be both used as the sulfur source and as a catalyst, no impurity is generated, and thus, the product purity is further improved.

The invention relates to a method for preparing MoS2 microspheres by a solvent hot method, which comprises the following preparation steps: 1) mixing molybdenum source compounds and sulfur source compounds into an alcohol solvent, sufficiently stirring the mixture, and carrying out ultrasonic processing for sufficiently dispersing the mixture; 2) then, transferring the uniformly dispersed mixture into a reaction kettle for carrying out constant-temperature reaction; and 3) carrying out natural cooling, separation, washing and drying on reacting substances to obtain black MoS2 microspheres. The invention has the advantages of mild reaction condition, good reaction reproduction quality, simple preparation process, low preparation cost and high product yield and purity, and is hopeful to realize mass production. The MoS2 products prepared by the solvent hot method of the invention have very important application prospects in all aspects of energy storage, catalysts, solid lubricating agents and the like.

The invention relates to a method for preparing layered molybdenum disulfide. The layered molybdenum disulfide is in a single-layer or double-layer structure, wherein a chemical vapor deposition method is adopted, elemental molybdenum metal and powdered sulfur is taken as a source, two-dimensional molybdenum disulfide is deposited on the surface of a substrate, the preparation parameters such as deposition temperature and growth time are optimized, and controllable growth of the single-layer or double-layer structure of the high-quality molybdenum disulfide is realized.

A substrate having an anti-adhesive coating thereon. The coating is made from a coating composition comprising solid particles of a release agent different from boron nitride and a binder comprising surface-modified nanoscale solid particles.

The invention discloses a preparation method of a molybdenum disulfide nanosheet in a stripping manner. Stirring or ultrasonic treatment is carried out in a mixed solvent containing an oxidizing agent, and a raw material, namely molybdenum disulfide, is stripped, so that the molybdenum disulfide nanosheet is formed. The preparation method of the molybdenum disulfide nanosheet has the advantages that a cheap reagent is adopted, operation is carried out at room temperature, energy consumption is low, no pollution is caused, efficiency is high, and the prepared molybdenum disulfide nanosheet can be widely applied to the fields of energy storage and conversion, catalysis, lubrication, various composite materials and the like.

The present invention relates to a low phosphorus lubricating oil composition for internal combustion engines which demonstrates fuel economy benefits while also providing high temperature oxidation, piston deposits, and wear. The lubricating oil composition of the present invention comprises: a) major amount of a base oil of lubricating viscosity; b) from about 0.1 to 10 wt % of an overbased alkaline earth metal alkyl aryl sulfonate detergent having a total base number (TBN) of about 25 to 500; c) from about 0.02 to 10 wt % of a oxymolybdenum-containing complex; d) from about 0.1 to 5 wt % of a friction modifier; and e) from about 0.2 to 10 wt % of an antioxidant selected from the group consisting of a diphenylamine type, a sulfurized ester-containing compound and mixtures thereof; wherein the total concentration of the oxymolybdenum-containing complex and antioxidant must be at least 1.3 wt %, based on the total weight of the lubricating oil composition and wherein the phosphorus content of the total lubricating oil composition is 0.08 wt % or less, based on the total weight of the lubricating oil composition.

The invention relates to a preparation method of flower-shaped hollow molybdenum disulfide microspheres, belonging to the technical field of nanometer material preparation. The method provided by the invention comprises the following steps of: (1) solution preparation: dissolving (NH4)2MoO4, CS(NH2)2, NH2OH.HCl and a surfactant into water, dissolving to obtain the solution, and then adjusting the pH value to 5-6.5 by acid; (2) agitating the solution obtained in step (1), and then transferring to a reaction kettle, sealing and reacting at a constant temperature, and then cooling to the room temperature to obtain the reaction product; (3) separating the reaction product, washing and drying to obtain the flower-shaped hollow molybdenum disulfide microspheres. The shape of the flower-shaped hollow molybdenum disulfide microspheres prepared by the method provided by the invention is controllable. The method provided by the invention is simple in process and low in cost; the prepared product is high in purity and high in yield, has an important application in the field of tribology and photochemistry, and is expected to be applied to large-scale industrial production.

The invention discloses a making method of MoS2 microball synthesized by ionic liquid auxiliary water, which comprises the following steps: dissolving molybdate in the deionized water to form 0.05-0.1m solution; adding thioacetamide or sulfourea as sulfur source with molar rate of thioacetamide or sulfourea and molybdate at 31-51; stirring evenly; adding 1-butyl-3-methyl imidazole tetrafluoride borate as ionic liquid with the bulk rate of ionic liquid and synthetic solution at 1300-1 50; stirring completely; transmitting solution into water heat reacting autoclave to react under 200-240 deg. c for 20-24h; cooling naturally; separating; washing; drying to obtain the product.

The invention discloses a preparation method of a monolayer MoS2 nano-sheet solution. The preparation method provided by the invention comprises the following steps of weighing MoS2 powder, putting the MoS2 powder into a pyrrolidone solvent, carrying out magnetic stirring of the mixture, transferring the stirred mixture to a hydrothermal reactor, carrying out hydrothermal pre-treatment, adding a surfactant into the mixture subjected to hydrothermal pre-treatment, carrying out ultrasonic stripping by an ultrasonic destrustor, carrying out centrifugation treatment, and collecting a supernatant liquor, wherein the supernatant liquor is the monolayer MoS2 nano-sheet solution. Compared with the prior art for preparing a monolayer MoS2 nano-sheet solution by a reaction of MoS2 and alkyl lithium and ultrasonic stripping, the preparation method provided by the invention has the advantages of the adopted organic solvent is not sensitive to the environment; a whole preparation period is short; and the obtained monolayer MoS2 nano-sheets have better dispersibility and stability and a lower cost.

A method of preparing metal chalcogenides from elemental metal or metal compounds has the following steps: providing at least one elemental metal or metal compound; providing at least one element from periodic table groups 13-15; providing at least one chalcogen; and combining and heating the chalcogen, the group 13-15 element and the metal at sufficient time and temperature to form a metal chalcogenide. A method of functionalizing the surface of semiconducting nanoparticles has the following steps: providing at least one metad compound; providing one chalcogenide having a cation selected from the group 13-15 (B, Al, Ga, In, Si, Ge, Sn, Pb, P, As, Sb and Bi); dissolving the chalcogenide in a first solution; dissolving the metal compound in a second solution; providing and dissolving a functional capping agent in at least one of the solutions of the metal compounds and chalcogenide; combining all solutions; and maintaining the combined solution at a proper temperature for an appropriate time.

Provided is an anode particulate, having a dimension from 10 nm to 100 μm, for use in an alkali metal battery, the particulate comprising (i) an anode active material capable of reversibly absorbing and desorbing lithium ions or sodium ions, (ii) an electron-conducting material, and (iii) a lithium ion-conducting or sodium ion-conducting electrolyte, wherein the electron-conducting material forms a three dimensional network of electron-conducting pathways in electronic contact with the anode active material and the electrolyte forms a three dimensional network of lithium ion- or sodium ion-conducting channels in ionic contact with the anode active material. The particulate can be of any shape, but preferably spherical or ellipsoidal in shape. Also provided is a cathode in a particulate form containing a cathode active material, an electron-conducting material forming a three dimensional network of electron-conducting pathways, and a lithium ion-conducting or sodium ion-conducting electrolyte forming a three dimensional network of ion-conducting channels.

A nanostructure, being either an Inorganic Fullerene-like (IF) nanostructure or an Inorganic Nanotube (INT), having the formula A_1−x-B_x-chalcognide are described. A being a metal or transition metal or an alloy of metals and/or transition metals, B being a metal or transition metal B different from that of A and x being ≦0.3. A process for their manufacture and their use for modifying the electronic character of A-chalcognide are described.

The invention discloses a method which adopts hydrothermal compound method for preparing flower-shaped microsphere of molybdenum disulfide. The invention comprises the steps: Na2MoO4, CS (NH2)2 and inorganic additives are added to a reactor and deionized water of 60 percent of the reactor column is also added and then the reactor is sealed and kept in a constant temperature case with a temperature ranging from 150 DEG C to 250 DEG C at least for 12 hours to be cooled in ambient temperature; obtained objects are washed by deionized water eccentrically to a neutral pH value; the flower-shaped microsphere of molybdenum disulfide is obtained after the objects are dried. The method of the invention has simple technique, easy operation, low cost and the products prepared has high purity and is promising for large-scaled production.

A process and apparatus are presented for obtaining inorganic fullerene-like nanostructures. A metal oxide is evaporated at predetermined temperature conditions, and is swept towards a reacting zone, to which first and second gas phase reacting agents are concurrently swept. The evaporated metal oxide thus interacts with the first reacting agent and is converted into metal suboxide nanoparticles in the gas phase. The condensing metal suboxide nanoparticles interact with the second reacting agent in the gas phase resulting in substantially pure phase of the inorganic fullerene-like nanoparticles.

The invention discloses a stripping method of stratified materials. The stripping method comprises the following steps of: weighing 30-70% of stratified materials, 0.2-5% of an organic intercalation agent, and the balance of a solvent, and mixing and stirring the weighed stratified materials, the weighed organic intercalation agent and the weighed solvent so as to obtain paste; placing the paste in a closed container, and performing static steeping; heating the steeped paste under the condition of continuously stirring, filtering the paste, washing the filtered paste, drying the washed paste so as to obtain a filter cake; placing 10-50% of filter cake, 0.5-30% of an inorganic intercalation agent, and the balance of a solvent into a closed container, uniformly mixing the filter cake, the inorganic intercalation agent and the solvent so as to obtain paste; performing static steeping; heating the closed container with the paste under the condition of 50-200 DEG C for 2-8h; cooling the heated closed container with the paste to room temperature; performing repeated heating and cooling; performing filtering; performing cleaning so as to obtain a secondary filter cake and a filtrate agent; adding the secondary filter cake and the filtrate agent in the solvent for ultrasonic stripping so as to obtain a dispersion liquid; filtering the dispersion liquid; washing the filtered dispersion liquid with deionized water; and performing vacuum drying so as to obtain the stratified materials. The stripping method disclosed by the invention solves the problems that the prior art for preparing the two dimensional crystal materials is low in efficiency, small in yield, high in environmental pollution, and the like. Defects and impurities are not led in the two-dimensional crystal materials.