220 results about "Tungsten disulfide" patented technology

The invention relates to the field of design and preparation of powder metallurgy friction materials, in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Raw materials used in the method comprise, by mass, 45%-55% of copper powder, 8%-20% of iron powder, 6%-15% of ferrochromium, 16%-22% of graphite, 0.5%-4% of molybdenum disulfide, 0.5%-4% of tin sulfide and 0.5%-4% of nickel-coated tungsten disulfide, and the mass ratio of the tin sulfide to the nickel-coated tungsten disulfide is (1-2): (1-2). In the nickel-coated tungsten disulfide, the content of nickel is 5-40%; the sum of the total amount of molybdenum disulfide, nickel-coated tungsten disulfide and tin sulfide is less than or equal to 5%. The preparation method comprises the following steps: weighing raw material powder according to the designed components, mixing, pressing and sintering to obtain the product. The composition design has the characteristics of scientificity, simple and controllable process and the like, and the obtained product has excellent tribological performance and completely meets the friction braking requirement of high-speed heavy-load equipment of 400km / h and above.

The invention relates to the technical field of materials, in particular to preparation of an amphiphilic tungsten disulfide nano material and application of the amphiphilic tungsten disulfide nano material in preparation of an oil displacement agent. The oil-displacing agent prepared from the amphiphilic tungsten disulfide nano material can reduce the interfacial tension of an oil-water interface, and can be quickly adsorbed to the oil-water interface to layer oil and water; the surface wettability of the rock is changed, the lipophilicity of the rock is changed into weak hydrophilicity, and the pore throat cannot be blocked due to excessive hydrophilicity while the oil phase is stripped. The nano oil-displacing agent disclosed by the invention can still have an enough stable use effect after being frozen at a low temperature and then unfrozen.

The invention belongs to the technical field of lubricating materials, and particularly discloses a composite lubricating material, a preparation method and a bearing. The composite lubricating material is prepared from the following raw materials: a hyperbranched polysiloxane modified wear-resistant material and a phenolic resin monomer, the hyperbranched polysiloxane modified wear-resistant material is obtained by modifying a first material with hyperbranched polysiloxane, and the first material is obtained by mixed ball milling or mixed grinding of a transition metal material and a polyphenol compound; the transition metal material is at least one of tungsten disulfide, tungsten diselenide and molybdenum diselenide. The composite water lubricating material prepared by the invention has the characteristics of excellent friction performance, excellent mechanical performance and high toughness, can meet the large-scale water lubricating sealing requirement, and solves the technical problems of particle aggregation and the like which are easy to occur in the existing improvement means.

The invention relates to the technical field of bearing lubricating grease, and particularly discloses a high-temperature-resistant lubricant composition and a preparation method thereof. The high-temperature-resistant lubricant composition comprises the following raw materials in parts by weight: 90-110 parts of base oil, 30-35 parts of a thickening agent, 2-3.5 parts of modified nanoparticles, 0.5-1.5 parts of an antioxidant, 1-3 parts of an antirust agent and 0.5-1 part of a friction modifier, the thickening agent comprises polyethylene glycol, modified polyurea lubricating grease and a surfactant according to a mass ratio of 1: (0.3-0.5): (0.1-0.15); the modified nano particles are brominated-1-hexadecyl-3-methylimidazolyl ionic liquid modified nano particles, and the nano particles comprise carbon nano particles and nano tungsten disulfide in a mass ratio of (2-3): 1. The lubricating grease composition provided by the invention has the advantages of good nanoparticle dispersibility, strong high temperature resistance, and excellent oxidation stability and antifriction and antiwear properties.

The invention discloses a method for producing a lubricating product by using tungsten-molybdenum resources, and relates to the technical field of tungsten-molybdenum resource utilization, and the method comprises the following steps: adjusting the mass ratio of Mo to WO3 in the tungsten-molybdenum resources to 10: (2-8), crushing, and roasting to obtain a roasted material; adding ammonia water into the roasted material for size mixing, and performing oxygen pressure ammonia leaching; sulfuric acid is added into the leachate for acid precipitation, and precipitates are obtained; introducing hydrogen sulfide gas to sulfurize the precipitate to obtain thioammonium salt; adding hydrochloric acid into the thioammonium salt for acidification reaction to obtain trisulfide; calcining the trisulfide in a protective atmosphere; and crushing the calcined material to obtain the product. According to the invention, a mixture of tungsten disulfide and molybdenum disulfide is obtained by utilizing a large amount of tungsten-molybdenum paragenic ore or a tungsten-molybdenum-containing waste catalyst in nature through a hydrometallurgy process, and can be used as a solid lubricating material, so that the production cost of the solid lubricating material is effectively reduced, the recovery rate of tungsten in ore is increased, and the environmental pollution is reduced.

The invention discloses a tannic acid modified tungsten disulfide nanosheet and application thereof in treatment of acetaminophen acute liver injury, the nanosheet takes a tungsten disulfide nanosheet as a core, and the surface of the tungsten disulfide nanosheet is modified with electronegative tannic acid. The nanosheet disclosed by the invention has good stability and biocompatibility, can be used for preparing a nano-drug for treating acetaminophen acute liver injury, and specifically targets and removes active oxygen at a liver injury part through an electrostatic adsorption effect, so that inflammatory response is inhibited, and symptoms caused by the acute liver injury are effectively relieved.

The invention provides a chlorine tungsten anion and cation co-doped sodium vanadium phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials. The positive electrode material is formed by doping V site with W < 4 + > ions and doping (PO4) 3 site with Cl <-> ions, the chemical formula of the positive electrode material is Na < 3-x > V < 2-x > W < x > (PO4) < 3-y > Cl3y / C, x is equal to 0.05, 0.1 and 0.15, and y is equal to 0.09, 0.12 and 0.15; according to the preparation method, ammonium metavanadate, sodium acetate and ammonium dihydrogen phosphate are taken as raw materials, tungsten disulfide and sodium chloride are taken as doping sources, citric acid monohydrate is taken as a chelating agent, and the chlorine tungsten anion and cation co-doped sodium vanadium phosphate electrode material is prepared by a solution gel method, so that the electronic conductivity is improved, and the rate capability and the cycling stability are improved; the preparation method has a good application prospect in sodium ion battery positive electrode materials.

The invention relates to a super-hydrophobic coating material for preventing pollution flashover on the surface of an insulator and a preparation method of the super-hydrophobic coating material. The coating material comprises hyperbranched polysiloxane, fluorinated graphene nanosheets, mesoporous silica, silane modified tungsten disulfide nanosheets, aluminum nitride nanoparticles, organic silicon resin, bisphenol A epoxy resin, deionized water, absolute ethyl alcohol and a pH regulator. The preparation method comprises the following steps: synthesizing tungsten disulfide nanosheets through a hydrothermal method, modifying the tungsten disulfide nanosheets with a silane coupling agent to improve the dispersibility, uniformly dispersing the tungsten disulfide nanosheets, fluorinated graphene nanosheets, mesoporous silica and aluminum nitride nanoparticles to form a nanofiller dispersion liquid, mixing the nanofiller dispersion liquid with hyperbranched polysiloxane, organic silicon resin and bisphenol A epoxy resin, and carrying out extrusion molding to obtain the composite material. A high-speed shearing dispersion and planetary stirring defoaming process is adopted; the coating material has excellent super-hydrophobicity, anti-pollution flashover capability and weather resistance, can effectively improve the protection performance of an insulator and prolong the service life, and is suitable for a long-term operation environment of power equipment.

The invention provides a copper-based graphite sealing material for an aero-engine and a preparation method of the copper-based graphite sealing material. The copper-based graphite sealing material can meet the performance requirements of a sealing bush for the aero-engine in different directions. The material is a copper-based graphite sealing material formed by directionally arranging anisotropic lamellar graphite; the material is prepared from the following raw materials in percentage by mass: 60%-70% of copper powder, 18%-32% of iron powder, 6%-12% of graphite, 0.01%-0.5% of silicon dioxide, 0.01%-0.5% of aluminum oxide and 0.01%-0.5% of tungsten disulfide, and the sum of the mass percentages of the components is 100%. The copper powder is irregular electrolytic copper powder, the content of Cu is larger than or equal to 99.9%, and the particle size range is 48-100 microns; the iron powder is porous sponge iron powder, the content of Fe is larger than or equal to 99.9%, and the particle size range is 48-100 microns; the graphite is natural lamellar graphite, the particle size range is 48-100 [mu] m, and the thickness range is 8-18 [mu] m; the particle sizes of the silicon dioxide, the aluminum oxide and the tungsten disulfide are 2-5 microns.

The invention relates to the field of sensors, and discloses an acoustic sensor and a preparation method thereof. The acoustic sensor comprises an upper support body, an acoustic sensing layer and a lower support body; the acoustic sensing layer comprises a first electrode layer, a flexoelectric material layer and a second electrode layer which are stacked in sequence; the flexoelectric material layer contains a two-dimensional layered material and an ion regulator; the two-dimensional layered material is selected from at least one of graphene oxide, boron nitride, vermiculite, molybdenum disulfide, tungsten diselenide, tungsten disulfide, black phosphorus, Mxene, molybdenum ditelluride and tungsten trioxide; the ion regulator is selected from one or more than two of polystyrolsulfon acid, polyethylene glycol, poly (diallyldimethylammonium chloride), carboxyl ethylene copolymer, polyethylene sulfonic acid, polymethylacrylic acid, polyethylene phosphoric acid, polyvinylamine, sodium alginate, silk fibroin and carboxylated nanofiber. The acoustic sensor operates by using the flexoelectric effect, and has higher sensitivity and high Young modulus.

The invention discloses a two-dimensional field effect transistor with high-temperature thermal stability and a preparation method thereof, and mainly solves the problem that a two-dimensional material in an existing two-dimensional field effect transistor can be oxidized and decomposed at high temperature. The device comprises a substrate (1), an insulation packaging protection bottom layer (2), a two-dimensional material film layer (3), an insulation packaging protection top layer (6) and a gate electrode (7) from bottom to top, a source electrode (4) and a drain electrode (5) are arranged at the two ends of the film layer (3), and the packaging protection bottom layer and the packaging protection top layer both adopt any one or combination of more of aluminum nitride, hexagonal boron nitride or silicon nitride. Oxygen molecules in the air are prevented from diffusing to the two-dimensional material film layer for reaction at high temperature, so that the two-dimensional material film layer plays a role in high-temperature protection; the two-dimensional material film layer is made of molybdenum disulfide or tungsten disulfide or tungsten diselenide. The high temperature resistance of the two-dimensional field effect transistor is improved, oxygenolysis of the two-dimensional material at high temperature is avoided, and the two-dimensional field effect transistor can be used for aerospace, deep well drilling or other high-temperature environments.

According to the low-temperature-resistant and oil-resistant hydrogenated butadiene-acrylonitrile rubber material and the preparation method thereof, firstly, a carboxyl-terminated polyester resin-alcohol-HNBR ternary polymer system is adopted as a basis, friction force between chain segments can be weakened in a cross-linked network, the mechanical property of the rubber material is improved, connection is achieved by means of a chemical polymerization mode, and the low-temperature-resistant and oil-resistant hydrogenated butadiene-acrylonitrile rubber material is obtained. Test oil can be prevented from being separated out; on the basis, the fluorine-containing rubber is mixed with the same rubber material subjected to graft modification, a grafting substance containing a fluorine element can be added on the basis of a ternary polymer system, and the obtained modified fluorine-containing rubber introduces fluorine atoms, so that the oil resistance of the material is facilitated. The modified tungsten disulfide added into the rubber material not only can prevent agglomeration of the filler, but also better meets the requirements of the rubber low-temperature-resistant additive. The preparation method is easy to operate, reasonable in design, capable of being further regulated and controlled according to different requirements, high in universality and worthy of application and popularization.

The invention belongs to the technical field of integrated photonic devices, and particularly relates to an electric tuning silicon nitride waveguide multimode interference coupler based on a two-dimensional material covering layer. In order to solve the problem that an existing silicon nitride photonic device lacks effective electro-optical regulation and control capacity, a two-dimensional material covering layer (such as molybdenum disulfide and tungsten disulfide) is integrated on the surface of a silicon nitride waveguide, and an up-and-down structure of a metal electrode-two-dimensional material-silicon dioxide cladding-silicon nitride waveguide is constructed. When external bias voltage is applied, the effective refractive index of the waveguide mode is changed through evanescent field coupling by means of the electrical refraction effect of the two-dimensional material, and active regulation and control of the optical path of the silicon nitride waveguide without the thermo-optic effect are achieved. Compared with a lithium niobate-silicon nitride heterogeneous integration scheme, the two-dimensional material with the atomic layer thickness is compatible with the CMOS technology, a complex heterogeneous bonding technology is not needed, and the advantage of monolithic integration is achieved. The device is particularly suitable for a reconfigurable optical signal processing device in a silicon-based photon integrated circuit.

The invention provides a long-acting lubricating method for forming transition metal sulfide on the surface in situ, and belongs to the technical field of friction chemical synthesis and lubrication. The preparation method comprises the following steps: mixing an active sulfur-containing hydrogen bond donor with a hydrogen bond acceptor to obtain a sulfur-containing eutectic solvent; a sliding friction pair is formed by a substrate material and a pair, the sulfur-containing eutectic solvent is added to a contact area of the sliding friction pair and reaches an immersed state, friction is carried out, and the substrate material contains transition metal elements. Based on a friction chemical reaction mechanism, a sulfur-containing eutectic solvent is used as an active sulfur source, and stress and heat of a friction interface are utilized to develop a system for carrying out in-situ vulcanization reaction on the surface containing transition metal elements to generate transition metal sulfide with a lubricating property; the problem of performance degradation caused by friction loss and difficulty in supplement of transition metal sulfides such as molybdenum disulfide and tungsten disulfide in the use process of the traditional lubricant is solved, and the service life of a lubricating system is greatly prolonged.

The invention provides a perovskite / silicon laminated solar cell and a preparation method thereof. The perovskite / silicon laminated solar cell comprises a silicon substrate cell, a hole transport layer, a perovskite light absorption layer, an electron transport layer, a functional layer and an electrode which are sequentially laminated, the material of the electron transport layer comprises tungsten disulfide, and the material of the perovskite light absorption layer comprises a rare earth doped perovskite material. The perovskite / silicon laminated solar cell has high charge transmission capability and space environment endurance capability, is especially suitable for space scenes such as near-earth orbit satellites, and has high stability and environment adaptability.

The invention discloses a method for producing lubricating products by utilizing tungsten and molybdenum resources, and relates to the technical field of utilization of tungsten and molybdenum resources, and comprises the following steps: adjusting the mass ratio of Mo and WO3 in tungsten and molybdenum resources to 10:2‑8, crushing, roasting, and obtaining roasting material; adding ammonia water to the roasting material for slurry adjustment, and oxygen pressure ammonia leaching; adding sulfuric acid to the leaching solution for acid precipitation to obtain a precipitate; introducing hydrogen sulfide gas to sulfide the precipitate to obtain a thioammonium salt; adding hydrochloric acid to the thioammonium salt for acidification reaction to obtain a trisulfide; calcining the trisulfide under a protective atmosphere; and crushing the calcined material to obtain. The invention utilizes a large amount of tungsten-molybdenum paragenetic ore or waste catalyst containing tungsten and molybdenum in nature, and obtains a mixture of tungsten disulfide and molybdenum disulfide through a hydrometallurgical process, which can be used as a solid lubricating material, effectively reducing the production cost of solid lubricating materials and improving the recovery of tungsten in ores, and reducing environmental pollution.

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

A tricone bit having one or more bearings with deposited lubricant layers is disclosed. The lubricant layers may comprise one or both of a metal-phosphate and / or solid lubricant. The lubricant layers may be disposed on one or more of the bearings, the journal bases, and / or the cones. The lubricant layers can also be used for applications of bearings other than for tricone bits. The deposited lubricant layers may be more persistent lubrication for tricone bits, such as air-cooled tricone bits, compared to conventional lubricants for tricone bits. The metal-phosphate layer may include one or more of zinc phosphate, manganese phosphate, iron phosphate, or the like. The solid lubricant may include one or more inorganic fullerenes, tungsten disulfide, molybdenum disulfide, graphite, graphene, or the like.

The application belongs to the technical field of material synthesis and biological medicine, and particularly relates to a preparation method and application of a WS2 QDs / RBC nanocomposite. The application extracts cell membranes from red blood cells by differential centrifugation combined with cell ultrasonic crushing, mixes and incubates the cell membranes with WS2 QDs of nanometer size, and obtains a red blood cell membrane modified WS2 QD nanocomposite through electrostatic adsorption. The red blood cell membrane modified WS2 QD nanocomposite constructed by the application has good stability, excellent photothermal performance, ROS resistance, Cu 2+ chelation capacity, and the ability to inhibit the aggregation of A beta monomers and photolytic depolymerization of A beta fibrils, can effectively reduce oxidative stress damage and reduce the concentration of A beta fibrils, and can be used for preparing a drug for treating Alzheimer's disease, thereby treating Alzheimer's disease and having a wide application prospect.

The invention relates to the technical field of sliding materials for seismic mitigation and isolation supports, and particularly discloses a self-lubricating wear-resistant composite material for a building seismic mitigation and isolation support and a preparation method of the self-lubricating wear-resistant composite material. The self-lubricating wear-resistant composite material for the building shock absorption and isolation support comprises the following raw material components: aliphatic polyketone, polytetrafluoroethylene, high polystyrene resin modified methyl vinyl silicone rubber, silicone resin, solid lubricating particles, silicone oil, a compatilizer, an antioxidant, a stabilizer and a coupling agent. The solid lubricating particles comprise the following raw material components: tungsten disulfide and hexagonal boron nitride. The self-lubricating wear-resistant composite material for the building shock absorption and isolation support prepared by the invention can keep a low and stable friction coefficient and excellent wear resistance for a long time, the dependence on external lubricating grease is remarkably reduced, and the technical problems that the self-lubricating performance of an existing support material is quickly attenuated, the maintenance is frequent and the cost is high are solved.

The invention relates to a method for preparing a manganese phosphate conversion film. According to the method, the nanoscale tungsten disulfide particles are introduced into the surface conditioning agent, and then the manganese phosphate conversion film is further formed, so that the friction coefficient is remarkably reduced, and the lubricating property of the manganese phosphate conversion film is improved.

The invention discloses a p-type tungsten disulfide nanotube bundle, a preparation method thereof and application of the p-type tungsten disulfide nanotube bundle in a photoelectric detector with adjustable light response linearity, and the method comprises the following steps: depositing an Au film on a SiO2 / Si substrate, and carrying out annealing to form a zero-dimensional Au nanoparticle catalytic layer; the method comprises the following steps: respectively placing tungsten trioxide (WO3) powder and sulfur (S) powder in different areas of a single-temperature-area tubular furnace, heating to 850-1000 DEG C in an Ar / H2 mixed gas low-pressure atmosphere, and reacting to generate a WS2 nanotube bundle with a multi-wall hollow structure; the obtained material has a cluster-shaped morphology in dense interlaced distribution, and shows stable p-type conductive characteristics. A photoelectric detector prepared based on the material has high responsivity (2.7 * 10 < 4 > A / W), high detection rate (1.6 * 10 < 13 > Jones) and quick response (15 ms) in a wave band of 375-1550 nm, and keeps stable performance in a range of 10-300 K. The method is simple in process, the growth process of the tungsten disulfide nanotube bundle can be accurately controlled, the polarity of tungsten disulfide is changed to be p-type, and large-scale preparation can be achieved.

The invention discloses a WS2 negative electrode material and a preparation method thereof, a negative electrode and a supercapacitor, and the preparation method comprises the following steps: S1, carrying out the hydrothermal synthesis reaction of tungsten disulfide and germanium dioxide, and obtaining a doped material; s2, germanium dioxide in the doped material is extracted through a solution etching extraction method, and a porous WS2 material is obtained; and S3, carrying out hydrothermal reaction on the porous WS2 material, a cross-linking agent and zirconium dioxide to obtain the modified WS2 negative electrode material. Through the porous structure, crosslinking and ZrO2 doping, the negative electrode material can maintain high specific surface area and has structural stability and high conductivity at the same time, so that the large-current charge-discharge performance of the supercapacitor is remarkably improved.

The invention discloses a method for enhancing photoluminescence of single-layer tungsten disulfide through acid and application of the method, and particularly relates to the field of two-dimensional semiconductor materials. The method comprises the following steps: bonding a plurality of WS2 layered samples on a first substrate, forming a WS2 sheet layer on the surface of the first substrate, evaporating a metal film on the surface of the WS2 sheet layer, and forming a WS2 layer-metal film layer on the surface of the first substrate; transferring the WS2-metal film layer to a second substrate, and depositing on the second substrate to obtain a WS2 layer-metal film layer; removing the metal film layer by using an etching solution to obtain a WS2 sample on the surface of the second substrate; the second substrate with the WS2 sample attached to the surface is placed in a hydrobromic acid aqueous solution, and the acid-enhanced single-layer tungsten disulfide is obtained. According to the method, WS2 is subjected to acid treatment, and Br can fill up sulfur vacancies and reduce non-radiative recombination centers, so that a PL peak is close to intrinsic emission energy, and PLQY is improved.

The invention discloses a room-temperature DMMP sensor based on a platinum diselenide van der Waals heterojunction, and relates to the technical field of gas sensing. The sensor comprises an electrode, a platinum diselenide layer loaded on the surface of the electrode and a nano material loaded on the surface of the platinum diselenide layer, wherein the platinum diselenide layer and the nano material form a Van der Waals heterojunction; wherein the nano material is a low-dimensional nano material such as a carbon nano tube, graphene, zinc oxide, molybdenum disulfide or tungsten disulfide. The platinum diselenide / Van der Waals heterojunction sensor realizes trace detection of dimethyl methylphosphonate (DMMP) at room temperature by using excellent performance of platinum diselenide and a synergistic effect of the Van der Waals heterojunction, has the advantages of low working temperature, high sensitivity, good stability, high response speed and the like, and can meet DMMP detection requirements in the fields of environmental monitoring, public safety and the like.

The application discloses a flower ball-shaped bismuth disulfide / tungsten disulfide composite material and a preparation method and application thereof. Tungsten hexachloride is added into anhydrous ethanol solution and fully stirred, then bismuth nitrate pentahydrate is added into the mixed solution and stirred to uniformly disperse the bismuth nitrate pentahydrate into the solution, then thioacetamide is added and stirred to be uniform, the obtained solution is moved into a reaction kettle, and the reaction kettle is sealed and placed into a homogeneous reactor; after the reaction is completed, the product is taken out, washed and fully dried in a vacuum oven to obtain the composite material. The composite material has a thickness of 20-30 nm, and nanosheets are vertically grown on a self-assembled flower ball-shaped structure with a diameter of 350-400 nm; the composite material can be applied to preparation of a potassium ion battery negative electrode material, and the structure is more stable, the conductivity is better, and the electrochemical performance is greatly improved.

The application relates to a high-temperature heavy-load long-life knuckle bearing and belongs to the technical field of knuckle bearings. The knuckle bearing comprises a lubricating structure arranged between an outer ring and an inner ring; the first base material of a left half outer ring and a right half outer ring is Al 0.5 CoCrFeTa 0.4 Ni 2.1 High-entropy alloy is used for balancing strength and toughness and improving high-temperature mechanical property stability; the second base material of the inner ring is AlCoCrFeTa 0.8 Ni 2.1 High-entropy alloy; the inner ring and the outer ring are provided with an ion implantation layer, a CrAlN coating and an Ag coating; the surface hardness of the inner ring and the outer ring is improved, the bonding force between the CrAlN coating and the base is improved, frictional resistance is reduced, heat generated in the bearing operation process is led out, the solid lubricant material of the lubricating structure is tungsten disulfide which is filled in a groove; a continuous and stable lubricating transfer film is formed on a friction surface, and the service life is improved.

The invention provides a graphene-based lubricating oil additive as well as a preparation method and application thereof, and belongs to the technical field of industrial pump lubrication. The graphene-based lubricating oil additive provided by the invention comprises the following components in percentage by mass: 0.6-5% of a hydroxylated graphene-nano tungsten disulfide composite material, and hydroxylated graphene and nano tungsten disulfide in the hydroxylated graphene-nano tungsten disulfide composite material form an interlayer intercalation structure; 2-8% of nano magnesium aluminum silicate; 0.3%-1.2% of porous silicon dioxide elastic particles; 1%-5% of fluorinated carbon nanotubes; 0.5-2% of a corrosion inhibitor; and the balance of base oil. The graphene-based lubricating oil additive provided by the invention is used for lubricating a water pump, has an excellent cavitation damage repairing effect, is excellent in wear resistance and friction reduction performance, is beneficial to reducing the load current of a motor and improving the energy efficiency, and also has an excellent noise reduction effect.

The invention belongs to the technical field of solid lubrication, and discloses a self-lubricating repairing spray for a railway switch sliding plate and a preparation process of the self-lubricating repairing spray. The self-lubricating repairing spray comprises the following components in parts by weight: 15-20 parts of an adhesive, 16-21 parts of a lubricant, 5-8 parts of a wear-resistant agent, 0.22-0.4 part of an auxiliary agent and 35-45 parts of an organic solvent, the adhesive adopts epoxy modified polyimide resin, and the lubricant is selected from one or more of molybdenum disulfide, tungsten disulfide and polytetrafluoroethylene. The self-lubricating repairing spray is used for spraying and repairing a sliding plate which is worn after being used for a period of time, the lubricating and wear-resisting performance of the sliding plate can be effectively kept, switch equipment maintenance is facilitated, a new sliding plate does not need to be replaced or lubricating paint does not need to be smeared again, the labor intensity of maintenance workers and the equipment cost are greatly reduced, and the maintenance efficiency is improved. And the normal operation of the railway switch is ensured.

The application discloses a high-temperature heat-stable two-dimensional field effect transistor and a preparation method, and mainly solves the problem that two-dimensional materials in the two-dimensional field effect transistor are oxidized and decomposed at high temperature. The two-dimensional field effect transistor comprises, from bottom to top, a substrate (1), an insulating encapsulation protection bottom layer (2), a two-dimensional material thin film layer (3), an insulating encapsulation protection top layer (6), a gate electrode (7), source electrodes (4) and drain electrodes (5) at two ends of the thin film layer (3), and the encapsulation protection bottom layer and the encapsulation protection top layer are both made of any one or a plurality of combinations of aluminum nitride, hexagonal boron nitride or silicon nitride, so that oxygen molecules in air are prevented from diffusing to the two-dimensional material thin film layer to react at high temperature, and the two-dimensional material thin film layer plays a role in high-temperature protection; the two-dimensional material thin film layer is made of molybdenum disulfide, tungsten disulfide or tungsten diselenide. The two-dimensional field effect transistor has improved high-temperature resistance, and the oxidation and decomposition of the two-dimensional material at high temperature are avoided, and the two-dimensional field effect transistor can be used in aerospace, deep well drilling or other high-temperature environments.