6 results about "Niobium nitride" patented technology

This invention discloses a method for controlling the thermal relaxation path of superconducting nanostructures and its application. This method utilizes a van der Waals integration strategy to sequentially fabricate a molybdenum disulfide layer on a silicon / silicon oxide substrate using chemical solution deposition and a niobium nitride superconducting layer using magnetron sputtering, constructing a niobium nitride / molybdenum disulfide heterostructure with intrinsic anisotropic thermal conductivity. Superconducting nanodevices with specific geometric configurations are designed for this heterostructure. Leveraging the ultra-high in-plane thermal conductivity of molybdenum disulfide and its suppressed out-of-plane heat transfer characteristics, the method achieves directional control of the internal thermal relaxation path of the superconducting nanostructure, verifying its dual advantages of optimizing thermal management and enhancing superconducting performance. The control method of this invention is mature and controllable, effectively transforming disordered thermal relaxation into directional heat transfer, significantly improving the thermal stability and integration density of superconducting devices, and providing a core solution for the thermal management of nanocircuits in fields such as superconducting quantum computing and high-sensitivity quantum detection.

The application discloses a superconducting diode device based on a single-layer niobium nitride nanoring and a control method thereof, and belongs to the technical field of superconducting electronics. The superconducting diode device comprises an insulating substrate and a niobium nitride layer. The niobium nitride layer comprises a first working line, a second working line and an intermediate ring. The first working line comprises a first line segment, a second line segment and a first intermediate part. The second working line comprises a third line segment, a fourth line segment and a second intermediate part. The intermediate ring is connected with the first intermediate part and the second intermediate part. The application uses a single-layer niobium nitride film, and realizes a structure of a superconducting diode with a minimum size and a single layer by means of the action of a nanoring with geometric asymmetry and an external magnetic field. The device size is greatly reduced, which is conducive to high-density integration and miniaturization application, and conducive to realizing low-power consumption and high-speed rectification control. The difficulty of material and interface control is greatly reduced. The process flow is simple and has good repeatability, which is conducive to reducing the preparation cost and improving the consistency of the device.

The application provides a kind of high hardness easy-to-machine ultra-low carbon stainless steel, by mass percent, chemical composition includes: chromium 16-20%, nickel 8-14%, molybdenum 0-3%, niobium 0.15-0.20%, nitrogen 0.1-0.3%, carbon ≤0.03%, the balance is iron. It also includes its preparation method, including S1: raw material proportioning;S2: raw material smelting;S3: decarburization refining;S4: component adjustment;S5: preparation of ingot;S6: ingot hot deformation breakdown processing;S7: billet heat treatment;S8: surface treatment processing;S9: product detection into warehouse. The application adds 0.15~0.20 niobium (Nb) elements and 0.1~0.3% nitrogen (N) elements in molten steel, generates trace amounts of niobium nitride and niobium carbide hardening phase during solidification, and increases 850~930℃ stabilization treatment in subsequent heat treatment process, makes niobium nitride and niobium carbide precipitate and disperse, makes the hardness of castings reach HB180~220, thereby improves the machining cutting performance of castings.

The application discloses a method for preparing two-dimensional metal nitride by using bulk metal oxide powder, which comprises the following steps: 1) uniformly mixing and grinding metal oxide powder with alkali metal carbonate or alkali metal hydroxide; adding neutral alkali metal or alkali earth metal halide salt, and uniformly mixing and grinding again; 2) performing heat preservation reaction on the mixture obtained in the step 1) under ammonia atmosphere, and cooling; 3) performing acid washing on the reaction product obtained in the step 2), washing to neutral, performing suction filtration and centrifugation, and drying, so as to obtain two-dimensional metal nitride in nanosheet shape. The application firstly proposes a method for preparing two-dimensional metal nitride nanosheet by using alkaline-neutral mixed double salt as an auxiliary, and the alkali metal carbonate or alkali metal hydroxide is used as a reactant to synthesize an intermediate of alkali metal oxide with two-dimensional layer-like structure, and the neutral alkali metal or alkali earth metal halide salt is used as a molten salt auxiliary agent to promote the nitridation conversion of the alkali metal oxide. The method is suitable for preparing two-dimensional niobium nitride by using bulk niobium oxide, two-dimensional tungsten nitride by using bulk tungsten oxide, and two-dimensional molybdenum nitride by using bulk molybdenum oxide, and is related to a simple process and low cost.

This invention relates to the field of powder metallurgy high-nitrogen steel preparation technology, specifically a method for optimizing the corrosion resistance of high-nitrogen steel based on powder metallurgy technology. The method includes: pre-treating gas-atomized high-nitrogen steel pre-alloyed powder by inert gas purging, constant-temperature heating for degassing, and mechanical stirring; then physically mixing it with a nano-chromium nitride, vanadium nitride, and niobium nitride composition; during filling, activating a variable-frequency mechanical vibration table to achieve gradient densification filling with a higher density at the bottom of the mold than at the top; after multi-stage vacuum and inert gas circulation, using stepped heating and simultaneous application of axial pressure and isotropic inert gas static pressure to complete solid-state sintering and preliminary densification. This invention, through gradient filling and multi-field coupled sintering process design, improves powder distribution and sintering densification state, reduces microscopic defects in the matrix, optimizes nitrogen element distribution, and enhances the corrosion resistance of high-nitrogen steel. The process has strong adaptability and is suitable for the powder metallurgy preparation of high-nitrogen steel components.

This application relates to the field of fuel cells, specifically disclosing a highly corrosion-resistant and conductive coating for fuel cell metal bipolar plates based on a micro-nano interpenetrating network structure and its preparation method. The highly corrosion-resistant and conductive coating for fuel cell metal bipolar plates based on a micro-nano interpenetrating network structure comprises, from bottom to top: a metal bonding layer, a corrosion-resistant blocking layer, and a conductive hydrophobic surface layer deposited on the surface of the bipolar plate substrate; the metal component of the metal bonding layer is selected from at least one of titanium, chromium, nickel, aluminum, tungsten, and niobium; the corrosion-resistant blocking layer includes alternating stacked amorphous carbon layers and metal nitride layers, wherein the metal nitride is selected from at least one of titanium nitride, chromium nitride, niobium nitride, zirconium nitride, molybdenum nitride, and tantalum nitride; the conductive hydrophobic surface layer is an amorphous carbon layer or a metal nitride layer containing polytetrafluoroethylene or fluorinated graphene. The coating of this application exhibits good adhesion to the metal bipolar plate and can improve the corrosion resistance and conductivity of the metal bipolar plate, extending the service life of the fuel cell.