34 results about "Tungsten borides" patented technology

The invention discloses application of a composite film with a multi-element and multi-phase structure in surface lubrication of an aerospace vehicle or a nuclear power bearing in a high-temperature environment. The composite film comprises a titanium transition layer, a titanium / molybdenum disulfide / tantalum / tungsten diboride gradient transition layer and a multi-element and multi-phase structure layer which are sequentially formed on the surface of a base body. The multicomponent multiphase structure layer comprises a molybdenum disulfide / tantalum / tungsten diboride composite layer, the molybdenum disulfide / tantalum / tungsten diboride composite layer comprises tantalum nanoparticles, a molybdenum disulfide layer and a tungsten diboride layer, and the tantalum nanoparticles are distributed between the molybdenum disulfide layer and the tungsten diboride layer. The composite film with the multi-element and multi-phase structure shows higher hardness and hardness / elasticity ratio and low friction coefficient and wear rate at the high temperature of 400 DEG C, and meanwhile, the composite film can meet stable lubrication and long-life reliable service of aerospace vehicles and nuclear power bearings under harsh and complex variable working conditions.

The invention provides a layered porous WB (at) WO3 heterojunction nanosheet, a preparation method thereof and application of the nanosheet in a lithium-sulfur battery diaphragm, tungsten boron aluminide is etched by using alkali liquor to remove an Al layer in a phase to obtain a two-dimensional layered tungsten boride precursor, and then an in-situ oxidation reaction is performed to generate a WB (at) WO3 heterojunction material. Compared with the prior art, the preparation method disclosed by the invention is simple to operate, green and pollution-free to the environment, good in repeatability and easy to popularize, and the obtained porous layered structure is obtained. The precursor can be directly prepared by stirring, and the WB-coated WO3 heterojunction porous nanosheet is prepared simply and quickly by regulating and controlling the temperature. The method is used for constructing a functional modification layer on the surface of the diaphragm, so that the initial capacity of the lithium-sulfur battery is remarkably improved, the key problem of polysulfide shuttling is effectively solved, and the cycle life of the battery is comprehensively prolonged.

The invention discloses a preparation method of nuclear radiation protective clothing, and belongs to the technical field of nuclear radiation protection. The raw materials comprise, by weight, 80-100 parts of polyester chips, 15-29 parts of modified nanometer bismuth oxide, and 12-18 parts of tungsten boride. According to the prepared protective clothing, polyester serves as a base material, the comfort level is high, wrinkles are not prone to occurring, by adding tungsten boride and modified nanometer bismuth oxide, the protective clothing is endowed with excellent shielding performance, flame retardance and aging resistance, and the protective clothing is free of lead and toxicity and environmentally friendly; the weaving technology and the coating compounding technology are combined, the coating contains polypyrrole, the shielding performance of the protective clothing can be further improved, and in conclusion, the protective clothing has important application value in the technical field of nuclear radiation protection.

The invention provides a high-compaction coated modified lithium manganese iron phosphate positive electrode material as well as a preparation method and application thereof, and relates to the field of lithium ion battery materials. The positive electrode material is prepared by the following steps: mixing a phosphorus source, an iron source, a manganese source, a magnesium source, a titanium source, a cobalt source, a lithium source, a carbon source and a dispersing agent, grinding, performing spray drying, and performing primary sintering to prepare a lithium manganese iron phosphate semi-finished product; the preparation method comprises the following steps: uniformly mixing a lithium manganese iron phosphate semi-finished product with tungsten boride, carrying out three-stage grinding including coarse grinding, coarse and fine grinding and fine grinding, carrying out batch mixing on the ground reduced slurry according to different volume ratios to improve the compaction density of the material, uniformly mixing the slurry, carrying out spray drying, and carrying out high-temperature sintering to obtain the lithium manganese iron phosphate composite material. And carrying out airflow crushing and sieving to obtain the high-compaction coated and modified lithium manganese iron phosphate positive electrode material. After tungsten boride and lithium manganese iron phosphate are coated, chemical acting force is formed on the surface, the polarization phenomenon is remarkably weakened, and the positive electrode material shows good long-term cycle stability.

The invention discloses a high-mechanical-property aluminum-based composite material for shielding neutrons and gamma rays and a preparation method of the high-mechanical-property aluminum-based composite material for shielding the neutrons and the gamma rays, 6-series aluminum alloy is used as basic alloy, and tungsten boride with the volume fraction being 9-20% or mixed powder of tungsten and boron with the volume fraction sum being 9-20% is added, so that the high-mechanical-property aluminum-based composite material for shielding the neutrons and the gamma rays is obtained. The preparation method comprises the following steps: weighing raw material powder, putting the weighed raw material powder into a stainless steel tank, adding a ball milling medium and a lubricant, putting the obtained raw materials into the stainless steel tank, putting the stainless steel tank on a ball mill, carrying out vacuum ball milling to obtain a mixture, putting the mixture into a graphite mold, and carrying out hot pressing to obtain the high-strength graphite material. And heating and pressurizing in a vacuum environment or a protective atmosphere, carrying out hot pressed sintering under the conditions of heat preservation and pressure preservation, and cooling to room temperature to obtain the compact sintered block of the tungsten-boron-gadolinium-aluminum composite material. The tungsten-boron-gadolinium-aluminum composite material can achieve good neutron and gamma ray shielding at the same time, and has high application value.

Disclosed herein are compounds, methods, and tools which comprise tungsten borides and mixed transition metal borides.

The present invention discloses a tungsten boride with high fluidity and a pure phase thereof and a preparation method thereof. The method includes: (1) mixing tungsten powder, boron powder and grinding balls for ball milling to obtain a tungsten-boron mixed powder; (2) under an inert atmosphere, subjecting the tungsten-boron mixed powder to pressure sintering to obtain a pure-phase tungsten boride powder; (3) self-mixing the pure-phase tungsten boride powder; (4) screening the self-mixed tungsten boride powder to obtain a tungsten boride with high fluidity and a pure phase. The tungsten boride prepared by this method has a single phase and no other impurity phases, and at the same time has high fluidity.

To provide a better cBN-based composite that has improved properties for cutting or machining difficult-to-cut materials.SOLUTION: A cubic boron nitride (cBN)-based composite includes about 30-65 vol.% of cBN, about 3-30 vol.% of zirconium (Zr)-containing compounds, about 0-10 vol.% cobalt-tungsten-boride (CoxWyBz), about 2-30 vol.% of aluminum oxide (Al2O3), about 0.5-10 vol.% of tungsten boride, and less than or equal to about 5 vol.% of aluminum nitride (AlN).SELECTED DRAWING: None

Neutron shielding. The neutron shielding comprises a plurality of absorption layers, and at least one moderating layer. The plurality of absorption layers each comprise tungsten boride or tungsten carbide. The at least one moderating layer comprises a metal hydride. Each moderating layer is between at least two absorption layers.

Neutron shielding. The neutron shielding comprises a plurality of absorption layers (201, 203), and at least one moderating layer (202). The plurality of absorption layers each comprise tungsten boride or tungsten carbide. The at least one moderating layer comprises a metal hydride. Each moderating layer is between at least two absorption layers.

The invention discloses a boron-titanium-aluminum composite shielding material for nuclear radiation protection and a preparation method of the boron-titanium-aluminum composite shielding material, and belongs to the technical field of shielding materials. Comprising the following raw materials in parts by weight: 80-90 parts of aluminum alloy, 5-15 parts of tungsten boride particles, 5-8 parts of Gd2O3, 5 parts of TiH2 and 1-2 parts of stearic acid. The three shielding components in the aluminum-based shielding material achieve a synergistic effect, and light-weight efficient radiation protection is achieved; tungsten boride and Gd2O3 in the boron-titanium-aluminum composite shielding material provided by the invention realize double efficient shielding of gamma rays and neutrons; in addition, 157Gd and B in WB / TiB2 have a synergistic effect, so that an efficient thermal neutron absorption system is formed. Therefore, the boron-titanium-aluminum composite shielding material prepared by the invention has the advantages of light weight and efficient radiation resistance, and has important application value in the technical field of shielding materials.

The invention discloses a wide-temperature-range anti-attrition wear-resistant tungsten diboride-based composite film as well as a preparation method and application thereof. The wide-temperature-range anti-attrition and wear-resistant tungsten diboride-based composite film comprises a chromium transition layer, a chromium / tungsten diboride layer and a tungsten diboride / carbon / nitrogen doped layer which are sequentially stacked on the surface of a base body in the thickness direction of the wide-temperature-range anti-attrition and wear-resistant tungsten diboride-based composite film, the chromium transition layer is adjacent to the surface of the base body, and the tungsten diboride / carbon / nitrogen doped layer is arranged at the top end of the tungsten diboride-based composite film. The preparation method comprises the following steps: sequentially depositing the chromium transition layer, the chromium / tungsten diboride layer and the tungsten diboride / carbon / nitrogen doped layer on the surface of the substrate by adopting a magnetron sputtering technology to prepare the wide-temperature-range anti-attrition wear-resistant tungsten diboride-based composite film. The tungsten diboride-based composite film still keeps a low friction coefficient and a low wear rate under a high-temperature condition, and synchronous improvement of structural toughness and high-temperature lubricating performance is realized.

The application discloses a tungsten-boron stainless steel composite material and a preparation method thereof, and relates to the technical field of shielding materials, which comprises a boron-tungsten compound, wherein the boron-tungsten compound particles are dispersed in a stainless steel matrix. The tungsten-boron stainless steel composite material has high density of the dispersed boron-tungsten compound, tungsten is a heavy metal element with stable chemical properties and high gamma shielding efficiency; boron has a high neutron absorption cross section for medium and low energy neutrons, and is a high-efficiency neutron shielding component; the tungsten boride materials of various components have good compatibility with the stainless steel; at the sintering and other hot working temperatures of the stainless steel, the tungsten boride materials do not react with the stainless steel matrix; the boron-tungsten compound is dispersed in the stainless steel matrix, and the composite material prepared by the method has better neutron shielding performance and gamma shielding performance than traditional boron stainless steel.

The present invention relates to the technical field of ceramic substrates, and provides a high-temperature co-fired multi-layer ceramic substrate and a preparation method thereof. For the high-temperature co-fired multi-layer ceramic substrate, the raw materials include the following components in parts by weight: 100 parts of alumina, 4-12 parts of tungsten boride, 6-18 parts of borate compound, 3-6 parts of sintering aid, 2-4 parts of dispersant, 5-10 parts of binder, and 50-60 parts of solvent; the borate compound includes metaborate and polyborate with a weight ratio of 1-9:1. Through the above technical solution, the problem of poor flexural strength of multi-layer ceramic substrates in the related art is solved.

The present invention belongs to the field of polypropylene materials, and specifically discloses a polypropylene composition, a preparation method thereof, and an application. In the polypropylene composition of the present invention, the boronized tungsten and potassium bicarbonate composite adsorbent can significantly reduce the odor and VOC of the polypropylene composition, realizing the characteristics that the polypropylene material has excellent mechanical properties, a low odor level, and low VOC at the same time.

The application discloses a wear-resistant and corrosion-resistant nanometer multilayer ceramic-based film and a preparation method and application thereof. The wear-resistant and corrosion-resistant nanometer multilayer ceramic-based film comprises a chromium transition layer and a nanometer multilayer composite structure which are sequentially stacked in the thickness direction of the film. The nanometer multilayer composite structure comprises a plurality of period units which are stacked and arranged. Each period unit comprises a tungsten diboride / carbon nanometer layer and a carbon nanometer layer. The tungsten diboride / carbon nanometer layer in the period unit adjacent to the chromium transition layer is arranged adjacent to the chromium transition layer. The top end of the nanometer multilayer composite structure is the carbon nanometer layer. The wear-resistant and corrosion-resistant nanometer multilayer ceramic-based film has high bonding force, low atmospheric environment friction coefficient, good antifriction and wear resistance, good seawater corrosion resistance, can meet the lubrication stability and long service life requirements of a ship transmission system component, and makes up the shortcomings of poor salt mist resistance of a carbon-based film.

The invention discloses a high-strength aluminum alloy material and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing aluminum alloy powder from Cu, Mg, Cr, Si, Mn, Sc, Zr, Mo, Ce, Yb, Al and the like in a specific ratio through a water atomization method; and then the aluminum alloy powder is mixed with BW2 (tungsten boride), VB2 (vanadium diboride) and polyacrylonitrile to obtain mixed powder, 3D printing is conducted through an SLM metal printer, and heat treatment is conducted to obtain the composite material. The aluminum alloy material is obtained through the 3D printing technology, the strength is high, and the high-end quality requirements in the fields of aerospace and the like are met.

Provided is a neutron shield. The neutron shield includes a plurality of absorbing layers, and at least one decelerating layer. Each of the plurality of absorber layers includes tungsten boride or tungsten carbide. The at least one deceleration layer includes a metal hydride. Each decelerating layer is between at least two absorbing layers.

A neutron shielding composite material comprising a magnesium borate matrix and a tungsten boride filler is described, optionally including additional fillers such as tungsten. A method for manufacturing the composite material is also described.

The invention discloses a tungsten diboride-based composite nano multilayer film as well as a preparation method and application thereof. The thin film comprises a chromium transition layer and a composite nanometer multilayer structure which are sequentially arranged on the surface of a base body in a stacked mode in the thickness direction of the thin film, the composite nanometer multilayer structure comprises a plurality of periodic units arranged in a stacked mode, and each periodic unit comprises a chromium carbide nanometer layer and a tungsten diboride-carbon nanometer layer. The preparation method comprises the following steps: depositing a chromium transition layer on the surface of a substrate by adopting a magnetron sputtering technology, sequentially laminating and depositing a chromium carbide nano layer and a tungsten diboride-carbon nano layer on the chromium transition layer to form periodic units, and repeatedly preparing a plurality of periodic units to prepare the thin film. The film has the advantages of high temperature resistance, extremely low friction, strong binding force and the like, and can be applied to substrate surface protection in an extreme environment.

The invention belongs to the technical field of alloy materials, and particularly discloses a tungsten alloy material for a pantograph and a preparation method thereof.The tungsten alloy material comprises, by weight, 68-75 parts of spherical tungsten powder, 8-15 parts of flaky copper powder, 4-8 parts of high-entropy alloy powder, 2-6 parts of modified carbon nanotubes, 1-4 parts of spherical carbon powder, 1-3 parts of chromium powder, 0.5-2 parts of manganese powder and 0.2-0.6 part of zinc stearate; the high-entropy alloy powder comprises titanium aluminum carbide, molybdenum powder, tungsten diboride powder, cobalt powder, hafnium powder and zirconium powder, and the mass ratio of the titanium aluminum carbide to the cobalt powder to the hafnium powder to the molybdenum powder to the tungsten diboride powder to the zirconium powder is (25-35): (20-30): (10-20): (10-20): (8-15): (2-6). The tungsten alloy material provided by the invention has excellent impact toughness and wear resistance, is very suitable for preparing the pantograph, and has a wide application prospect.

The application provides a molybdenum disulfide tungsten diboride nanocomposite multilayer film and a preparation method and application thereof, and the molybdenum disulfide / tungsten diboride nanocomposite multilayer film is prepared by using a non-equilibrium magnetron sputtering technology, and comprises a titanium transition layer, a titanium / molybdenum disulfide / tungsten diboride multilayer gradient transition layer and a molybdenum disulfide / tungsten diboride multilayer doped layer which are sequentially stacked in the thickness direction, so as to obtain the molybdenum disulfide / tungsten diboride nanocomposite multilayer film. The molybdenum disulfide / tungsten diboride nanocomposite multilayer film has good substrate bonding strength, hardness and high hardness / elasticity ratio, the main phase molybdenum disulfide grows along the (002) crystal plane parallel to the substrate, the moisture resistance and high-temperature oxidation resistance of the molybdenum disulfide are greatly improved, the molybdenum disulfide exhibits excellent friction and wear performance under atmospheric normal temperature and high-temperature environment, and can meet the requirements of stable lubricating performance and long service life of key components of aerospace and nuclear energy machinery under harsh environment.

A neutron shield. The neutron shield includes a plurality of absorption layers and at least one moderation layer. Each of the plurality of absorption layers includes tungsten boride or tungsten carbide. The at least one moderation layer includes a metal hydride. Each moderation layer is between at least two absorption layers.

A neutron shielding composite is described comprising a magnesium borate matrix and a tungsten boride filler, optionally comprising other fillers such as tungsten. Methods of making the composite material are also described.

The application belongs to the technical field of composite ceramics, and particularly relates to a ternary boride composite ceramic, a preparation method thereof and application of the ternary boride composite ceramic as a composite ceramic wire drawing die. The ternary boride composite ceramic die is prepared by using tungsten boride, boron carbide and cobalt boride as main raw materials, and adding a small amount of grain inhibitors, rare earth oxides, solid lubricants and silicon nitride whiskers, and has simple process and low cost. In the application, borides are used to replace traditional carbide raw materials, and appropriate solid lubricants are added, so that the material has excellent wear resistance and friction reduction. The grain inhibitors and the rare earth oxides have the effects of refining grains and enhancing material toughness, and the silicon nitride whiskers can increase the strength and toughness of the material. Therefore, the ternary boride composite ceramic wire drawing die prepared by the application has better high-temperature oxidation resistance and friction reduction performance than a hard alloy wire drawing die, and has better toughness than a polycrystalline diamond wire drawing die, so that the service life of the die can be significantly improved.

Disclosed herein, in certain embodiments, are composite materials, methods, tools and abrasive materials comprising a tungsten-based metal composition, a tungsten carbide, and an alloy. In some cases, the composite materials or matrix are resistant to oxidation.

A method of selectively etching a hardmask layer formed on a device substrate is disclosed. The method includes providing an etching gas mixture to a processing region of a processing chamber, wherein a device substrate is disposed in the processing region when the etching gas mixture is supplied to the processing region, wherein the device substrate can include a substrate, at least one cavity formed in the substrate, and a hardmask layer formed over the at least one cavity and over the substrate. The method also includes providing radio frequency (rf) power to the etching gas mixture to form a plasma in the processing region.

This invention, belonging to the field of energy materials technology, discloses a self-supporting tungsten diboride electrode with a porous network structure, as well as its preparation method and application. The invention first synthesizes WB2 with a lamellar structure from tungsten trioxide powder, boron carbide powder, and carbon source powder. Using this WB2 as the raw material, the lamellar grains are bonded together into a network structure through rapid sintering, resulting in a tungsten diboride block material with a porous network structure. This material exhibits high electrical conductivity, provides a larger electrochemical specific surface area, and exposes more catalytically active sites.

The application discloses a kind of tungsten boride nano heterojunction, its preparation method includes the following steps: S1, tungsten boride powder is uniformly dispersed in ethylene glycol, and tungsten boride ethylene glycol solution is obtained;S2, the tungsten boride ethylene glycol solution obtained in S1 is added with glacial acetic acid and hydrogen peroxide, is fully stirred uniformly, and a mixed solution is obtained;S3, the mixed solution obtained in S2 is placed into microwave synthesis instrument and is subjected to microwave synthesis, after reaction, immediately take the upper solution and centrifugal, the solid product obtained after centrifugal, it is tungsten boride nano heterojunction.The tungsten boride nano heterojunction is synthesized by liquid phase stripping method in one step, ethylene glycol is used as reaction solvent, to provide higher reaction temperature for microwave synthesis reaction, in addition, acetic acid and hydrogen peroxide further react with tungsten boride, make compact tungsten boride nano structure loose, make nanometer sheet surface part oxidation into WO3, constitute heterojunction structure, first from top to bottom method obtains nanometer size tungsten boride heterojunction structure.

The invention relates to the technical field of bearings, in particular to a wear-resistant bimetallic knuckle bearing and a preparation process. According to the technical scheme, the alloy material comprises the following raw materials in parts by weight: 59.0 to 64.0 parts of iron, 3.2 to 7.2 parts of chrome steel, 2.3 to 5.2 parts of silicon-aluminum steel, 1.2 to 1.8 parts of tungsten boride, 5.2 to 8.1 parts of bismuth telluride, 3.5 to 4.5 parts of copper, 2.0 to 3.5 parts of zinc and 0.8 to 1.6 parts of high polymer. The prepared bearing can prevent corrosion of oxygen, water and other corrosive media to steel, the corrosion resistance of the bearing is improved, meanwhile, the abrasion resistance is improved, abrasion and friction of the bearing are reduced, in addition, the strength and hardness are improved, carbon elements in the chrome steel can improve the strength and hardness of the steel, the load capacity and the deformation resistance of the bearing are improved, and the service life of the bearing is prolonged. The bearing has high anti-fatigue performance, the risks of fracture and fatigue damage are reduced, friction loss and energy consumption of the bearing are reduced, and the efficiency of the bearing is improved.