17 results about "Tungsten borides" patented technology

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.

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

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 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.

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 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.

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.

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 silicone rubber materials, in particular to an organic silicon master batch applied to a special cable and a preparation method of the organic silicon master batch. The organic silicon master batch applied to the special cable is prepared from methyl vinyl silicone rubber, fumed silica, modified tungsten boride, hydroxyl silicone oil and a vulcanizing agent, and the modified tungsten boride is prepared through a three-step process: firstly, performing alkenylation treatment on tungsten boride, and then forming a core-shell structure through aniline polymerization; and finally, carrying out ion exchange modification by using sodium p-vinylbenzene sulfonate. The organic silicon master batch applied to the special cable has high mechanical strength and excellent radiation resistance, and is particularly suitable for manufacturing the special cable in extreme environments such as a nuclear power station and the like.

The application relates to a preparation method of a high-wear-resistance tungsten boride coating and belongs to the technical field of wear-resistant material preparation. By using a chemical vapor deposition technology, a pure tungsten coating with a thickness of about 29.1 microns is first prepared on a tungsten base, then a low-temperature solid-phase boronizing technology is used to convert part of the pure tungsten coating into a tungsten boride coating, and thus the surface hardness and wear resistance of the material are improved. Compared with direct chemical vapor deposition of tungsten boride on a metal surface, the method can avoid using the high-risk boron trichloride gas, and can effectively control the coating thickness and the microstructure. The coating preparation process can be applied to the surface strengthening modification of various metal materials, and has strong practical application value.

This invention discloses a multifunctional carbon nanotube-based radiation-shielding composite fiber for high-performance protective equipment and its preparation method, relating to the field of functional fiber materials technology. The composite fiber comprises the following components: organic polyester, functionalized multi-walled carbon nanotubes, nano-tungsten boride, an active agent, and a binder. The preparation method involves first subjecting the raw materials to cyclic homogenization treatment, followed by a two-stage melt-blowing process to form a composite fiber with a three-dimensional network structure. This composite fiber possesses excellent multifunctional properties, including protection against gamma rays and X-rays, protection against neutron radiation, antibacterial properties, and electrical conductivity. It is lightweight, flexible, and high-strength, making it suitable for the field of high-performance protective equipment.