770 results about "Tungsten disulfide" patented technology

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.

The invention discloses a compound nano material of graphene nano slice and tungsten disulfide (WS2), and a synthesis method and a preparation method thereof. The compound material is formed by mixing graphene and a WS2 nano material in a mass ratio of (1 to 1)-(4 to 1). The preparation method comprises the following steps of: preparing an oxidized graphite nano slice from graphite by a chemical oxidization method; then dissolving tungstic acid into deionized water so as to form 0.02 to 0.07M of solution; adding L-cysteine serving as a sulfur source and a reduction agent, wherein the mass ratio of the L-cysteine to the tungstic acid is (5 to 1)-(12 to 1); adding the oxidized graphite nano slice into the solution, and ultrasonically treating so that the oxidized graphite nano slice can be fully dispersed in the hydrothermal reaction solution; transferring the mixture into a hydrothermal reaction kettle and sealing; and synthesizing by a one-step hydrothermal method to obtain the compound nano material of graphene and WS2, wherein the mass ratio of the graphene nano slice to the WS2 is (1 to 1)-(4 to 1). The method has the characteristics of mild reaction condition and simple process. The compound nano material of graphene and WS2 synthesized by the method can be widely used as electrode materials of new energy batteries, high-performance national lubricants, catalyst carriers and the like.

The invention discloses an operating method for a vulcanized hydrogenation catalyst. The method comprises the following steps: impregnating the vulcanized hydrogenation catalyst with an organic complex solution of a group-VIII metal; carrying out heat treatment so as to allow a layer of a protective film to form on the surface of the vulcanized hydrogenation catalyst; carrying out treatment in the presence of inert gas so as to allow the group-VIII metal to be inlaid in the defect of molybdenum disulfide or tungsten disulfide, thereby forming a high-activity hydrogenation active phase; and then carrying out switching into hydrogen, adjusting pressure and temperature to reaction pressure and reaction temperature after air current is steady, feeding raw oil and beginning a hydrogenation reaction. The method provided by the invention can passivate the vulcanized catalyst, facilitates transportation, storage and filling of the catalyst and can improve hydrogenation performance of the catalyst.

The invention relates to a solid lubricating high-temperature anti-wearing powder composition and a preparation method of a compound coating of the composition. The powder composition comprises the following components in percentage by mass: 14-17.5% of nickel, 3-3.5% of chromium, 49-52.5% of chromium carbide and 25-30% of tungsten disulfide with a surface coated by an alloy-phosphorus alloy. A solid self-lubricating high-temperature anti-wearing compound coating is prepared by the powder composition through utilizing a laser smelting technology. According to the invention, NiCr-Cr3C2 compound powder is used as a metal substrate and the compound coating is formed by a ceramic anti-wearing phase and a metal toughening phase; WS2 is a solid lubricating phase and one layer of a micron-grade Ni-P alloy is coated on the surface of a WS2 powder grain by utilizing a chemical plating method, so that the thermal stability and the chemical stability of WS2 are increased, the decomposition and evaporation of the WS2 in a laser smelting process are effectively inhibited and the compatibility of the WS2 and the metal substrate is increased; and the compound material coating has the characteristic of high-temperature self-lubricating wearing resistance.

The invention discloses a method for preparing mono-disperse tungsten disulfide nano slices. The method comprises the following steps: ball-milling, mixing and activating tungsten oxide and sulfur serving as raw materials, and annealing for 30 to 120 minutes at the constant temperature of between 600 and 700 DEG C in a protective atmosphere; during annealing at the constant temperature, preposing a part of sulfur powder as a complementary sulfur source, wherein the mass ratio of the complementary sulfur powder to the reaction mixture is between 0.05 and 10; and then, cooling a reaction product to below 250 DEG C along with a furnace in the protective atmosphere to obtain the mono-disperse tungsten disulfide nano slices. The method prepares a large amount of mono-disperse slice tungsten disulfide material by a simple and effective chemical synthesis method; and the method is simple and quick, has low production cost, and can be widely used in the aspects of lubrication and catalysis.

The invention provides a self-lubricating solid composite material, which comprises 15-30 wt% of nickel-chromium alloy, 40-60 wt% of chromium carbide, 10-20 wt% of tungsten disulfide and 10-20 wt% of calcium fluoride. The invention also provides a preparation method of a self-lubricating solid coating. By a laser cladding method, the self-lubricating solid coating is formed on a matrix material. The self-lubricating solid composite material can be firstly coated on the matrix material and forms a coating by laser cladding; and also the matrix material can be firstly irradiated by a laser beam to form a molten pool, and then the self-lubricating solid composite material is sent into the molten pool and is continuously irradiated to form the coating. The prepared self-lubricating solid coating has excellent wear resistance and good lubrication performance within the temperature range of room temperature to 600 DEG C, and can satisfy the usage requirement under severe working conditions.

The invention proposes a method for growing a substrate-modified large-size monolayer molybdenum disulfide film through chemical vapor deposition. Ammonium sulfide serves as a substrate surface modifying agent; a nucleation rate is controlled through such methods as control of a concentration of the modifying agent, a dipping time and a cleaning method; and a film thickness is controlled through such methods as control of a growing temperature, a growing time and an air flow of the chemical vapor deposition. The method can efficiently grow the large-size monolayer molybdenum disulfide film under the condition of a relatively lower growing temperature on the basis of traditional growth chemical vapor deposition equipment. The method for growing large-size monolayer molybdenum disulfide, provided by the invention, is suitable for the growth of large-size monolayer tungsten disulfide, molybdenum diselenide, tungsten diselenide and the like similar to two-dimensional semiconductor materials in structure.

The invention discloses a preparation method of graphite alkene like tungsten disulfide nanometer sheet, which employs a high temperature solid phase synthesis method, and the method comprises the following steps: mixing thiourea and WO3 according to mol ratio 20:1-41:1 and fully grinding, and containing the grinded powder into a porcelain boat; heating a tubular furnace to 800-900 DEG C and letting nitrogen in; quickly pushing the porcelain boat into a central heat zone position of the tubular furnace and processing for 30-60 min at constant temperature; then, the mixture is naturally cooled to room temperature, and the graphite alkene like tungsten disulfide nanometer sheet is obtained. The invention has the advantages of simple technology and low cost, and the obtained product has high purity and yield, and is hopeful to be used in large scale industrial production.

Compositions and methods for ballistic conditioning firearm projectiles, firearms, and firearm components such as bores of barrels, by applying to such items a conditioning composition selected from the group consisting of hexagonal boron nitride, graphite, tungsten disulfide, antimony trioxide, talc, mica, and mixtures thereof, suspended in a carrier comprising a volatile solvent, and a binder selected from the group consisting of cellulosic-, alkyd- and acrylic-resins.

A threaded joint for steel pipes comprises a pin (1) and a box (2) each having a threaded portion (3a or 3b) and an unthreaded metal-to-metal contact portion (4a or 4b) as contact surfaces which contact each other when the joint is fastened. The contact surfaces (3a and 4a and/or 3b and 4b) of at least one of the pin (1) and the box (2) are coated with a lower layer of a solid lubricating coating containing a solid lubricating powder (e.g., molybdenum disulfide, tungsten disulfide, or graphite) and a binder (e.g., an epoxy or other organic resin) and an upper layer of a solid corrosion protective coating formed by an organic resin which does not contain solid particles.

Molybdenum disulfide or tungsten disulfide is good in catalytic hydrogen evolution activity, lithium storage performance, thermal stability and chemical stability. In order to increase the utilization rate of the molybdenum disulfide or the tungsten disulfide and improve the catalytic hydrogen evolution catalytic activity and the lithium storage specific capacity, sulfide needs to be prepared into a monomolecular layer or polymolecular layer two-dimensional material. An electrochemical method is adopted, a molybdenum disulfide (or tungsten disulfide)-metal composite material serves as an anode, graphite or a platinum electrode serves as a cathode, sulfate serves as an electrolyte, and thus two-dimensional molybdenum disulfide or tungsten disulfide with the thickness being 1-20 nm is successfully stripped out. By means of the two-dimensional sulfide, the electrocatalytic hydrogen evolution activity is good, and the lithium storage performance is excellent.

The invention provides steel bonded hard alloy which comprises the following components: 1.5wt%-6.0wt% of refractory carbide, 1.0wt%-3.0wt% of WS2, 1.0wt%-3.0wt% of C, 0.1wt%-0.5wt% of Mn, 10.0wt%-18.0wt% of Cr, 1.0wt%-5.0wt% of Mo, more than 0 but less than or equal to 1.8wt% of Si, more than 0 but less than or equal to 5.0wt% of Ni, and the balance of Fe. The invention also provides a preparation method for the steel bonded hard alloy. The raw materials, such as refractory carbide, tungsten disulfide, carbon and chromium are added in the steel bonded hard alloy, and a powder metallurgy sintering technology and a thermal treatment technology are adopted, so that the strength and hardness of the steel bonded hard alloy are increased, the abrasive resistance of the steel bonded hard alloy is increased and the service life of a stirring shaft abrasion-resisting sleeve prepared from the steel bonded hard alloy is prolonged.

The related composite poly-soap self-repair bearing lubricating grease comprises the basic liquid, composite calcium sulfonate, composite Ca-Li-base thickener, non-oxidizing anti-corrosion additive, metal deactivator, tungsten disulfide extreme pressure additive, wear-well additive, self-repair additive, and structural modifier; has well anti-oxidation ability and bearing capacity, can repair wore part on condition of extreme pressure and high temperature to supply the silver-plating lacking on bearing radial surface effectively, prolongs bearing service time on maximum limit, and has special application in oil drilling exploration.

The invention discloses a method for manufacturing an electric brush used for an industrial motor. In the method, a main material is formed by proportioning 52 kilograms of copper powder, 5 kilograms of tungsten disulfide, 2 kilograms of surfactant oleic acid, 41 kilograms of rubber powder, 15 kilograms of phenolic resin, 5 kilograms of epoxy resin and 80 kilograms of industrial alcohol. The invention also discloses a preparation process for the electric brush used for the industrial motor. The method has the advantages of high abrasion resistance, prolonged service lives of the electric brush and a motor slip ring and the like.

The invention relates to a preparation method of tungsten disulfide nanorods, belonging to the technical field of nano material preparation. The method provided by the invention comprises the following steps: (1) preparing a solution, that is, dissolving (NH4) 2WO4, CS (NH2) 2, NH2OH.HCl and a surfactant in water to obtain a solution, and then adjusting the pH value of the solution by acid to 5 to 6.5; (2) after stirring the solution obtained in the step (1), moving the solution into a stainless steel reaction kettle, sealing the solution, after thermostatic reaction, cooling the solution to room temperature, and obtaining a reaction product; and (3) separating, washing and drying the above reaction product to obtain tungsten disulfide nanorods. The tungsten disulfide nanorod prepared by the invention is uniform and controllable in particle size. The method disclosed by the invention is simple in process, low in cost, high in the purity of the obtained product, and high in yield, and has important applications in tribology, photochemistry and the like, and can be used for large-scale industrial production hopefully.

The invention relates to the field of tungsten disulfide, and particularly relates to a method of preparing large-area high-quality completely single-layered tungsten disulfide. A chemical vapor deposition technique is adopted. Gold the tungsten solubility of which is extremely low is adopted as a growth substrate, and a tungsten source and a sulfur source under atmospheric pressure at high temperature are subjected to a catalytic reaction on the surface of the gold substrate to grow, in a self-limiting manner, completely single-layered tungsten disulfide large-size monocrystalline and large-area continuous film. The characteristic that bonding between the prepared tungsten disulfide and the gold substrate under atmospheric pressure is weak is utilized, a bubbling transferring process and a process combining bubbling and reel-to-reel transferring are respectively adopted to transfer the large-area completely single-layered tungsten disulfide to rigid and flexible substrates under the premise of not destroying the gold substrate. The completely single-layered high-quality millimeter-level tungsten disulfide monocrystalline and large-area continuous film can be prepared through the method, thus laying foundations for application of single-layered tungsten disulfide in the fields of electron/optoelectronic devices, spinning devices, solar cells, gas/light sensors, flexible film electronic/optoelectronic devices, and the like.

The invention discloses a water-based lubricant based on nanometer tungsten disulfide, which comprises the following components and contents, by weight, 1% to 15% of nanometer tungsten disulfide, 1% to 10% of solid lubricant, 0.2% to 3% of antirust agent, 10% to 40% of aqueous stearic acid, 10% to 20% of waterborne zinc stearate, 0.4% to 4% of emulsifying stabilizer, 0.01% to 0.05% of defoaming agent, and 8% to 77% of water. The constituent content of the components sums up to 100%. The preparing method of the water-based lubricant and a usage method thereof are disclosed. The water-based lubricant based on the nanometer tungsten disulfide has the advantages of being good in the lubrication effect of the water-based lubricant, large in elongation coefficient, environment-friendly and unpolluted, and wide in applying scope. In addition, the preparing method of the water-based lubricant and the use method and process steps thereof are simple and fast so as to improve the production efficiency and benefit the environmental protection.

In accordance with various embodiments, there are nanostructured materials including WS₂ nanostructures and composites of WS₂ nanostructures and other materials and methods for synthesizing nanostructured materials. The method can include providing a plurality of precursor materials, wherein each of the plurality of precursor materials can include a tungsten reactant. The method can also include flowing, for a reaction time, a substantially continuous stream of carbon disulfide (CS₂) vapor in a carrier gas over the plurality of precursor materials at a temperature in the range of about 700° C. to about 1000 C, wherein the reaction time is sufficient to permit the tungsten reactant to react with carbon disulfide to form a plurality of tungsten disulfide (WS₂) nanostructures.

The invention relates to a preparation method for a large-area single-layer tungsten disulfide film based on atmospheric pressure chemical vapor deposition and a product. The preparation process comprises SiO2/Si substrate cleaning, spin coating of a WO3 anhydrous ethanol dispersion solution, substrate drying treatment, sample placement and tungsten disulfide film growth. By the adoption of the method, WO3 precursor is uniformly dispersed on a substrate by spin coating of the WO3 anhydrous ethanol dispersion solution, a single-ended-closed small-caliber quartz tube is placed in a quartz tube growth chamber, and the amount of S powder and WO3 precursor participating in a nucleation and film growth process is effectively controlled, so that the prepared tungsten disulfide film has the largearea, single layer and large size. The method has the beneficial effects of being quick and repeatable and is significant in preparation of the large-area single-layer tungsten disulfide film.