8 results about "Tungsten borides" patented technology

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

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.

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 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.

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.