19 results about "Magnesium boride" patented technology

The invention discloses a magnesium diboride superconducting wire and a preparation method thereof, and belongs to the technical field of superconducting wire processing. The preparation method comprises the following steps: preparing an MgB2 superconducting wire by adopting an in-situ powder sleeve method and a central Mg diffusion method, loading an Mg rod into a pre-pressed B tube to obtain an Mg / B composite rod, loading the Mg / B composite rod into an Nb / Cu composite tube, and loading MgB2 superconducting powder into a gap area between the Mg / B composite rod and the Nb / Cu composite tube to prepare the magnesium diboride superconducting wire. In the heat treatment process, the Mg element in the center area diffuses towards the surrounding B element and forms MgB2, meanwhile, the MgB2 powder on the edge serves as a template to induce and promote the solid-phase reaction of the Mg element and the B element, an MgB2 superconducting phase with the higher purity is generated, and therefore the wire rod obtains the higher current-carrying performance. The invention provides the MgB2 wire rod with better current-carrying performance under a low-field application condition.

The invention discloses a near-infrared fluorescent probe based on magnesium boride, a probe product as well as a preparation method and application of the near-infrared fluorescent probe. The near-infrared fluorescent probe based on magnesium boride is of a pH response type and is prepared by a method comprising the following preparation steps: (1) completely dissolving indocyanine green and polyvinylpyrrolidone in a solution to obtain a mixed solution; (2) keeping the mixed solution obtained in the step (1) away from light and continuously mixing for preset time; (3) adding magnesium boride into the system in the step (2), and continuously mixing the system in a preset time under a dark condition, so that the magnesium boride is combined with the indocyanine green and the polyvinylpyrrolidone; (4) centrifuging the solution obtained in the step (3) at 200-300rmp, and taking supernate; then, centrifuging the supernate at the speed of more than or equal to 12,000 rmp, and taking precipitate; and (5) obtaining a powder product from the precipitate obtained in the step (4), thereby obtaining the near-infrared fluorescent probe based on magnesium boride.

The invention relates to the technical field of superconducting cables, and aims to provide a magnesium boride superconducting cable for a magnet device and a preparation method of the magnesium boride superconducting cable for the magnet device. Two magnesium boride superconducting single wires and an annealed copper wire are twisted together to form a first-stage cable, a second-stage cable is formed by compositely twisting four first-stage cables, and a third-stage cable is formed by compositely twisting four second-stage cables; and after the three-stage cable is twisted, a layer of 316L stainless steel strip is overlapped and lapped to reinforce protection so as to enhance the electromagnetic force resistance and stable operation capability of the cable, and a layer of high-temperature-resistant glass tape is overlapped and lapped on the outermost layer to serve as an insulating layer. The magnesium boride superconducting cable produced by adopting the structure and the method is used for winding a magnet coil, the cable is straight and free of undesirable phenomena such as bending and snakelike in the winding process, the wound coil is poured with epoxy resin, the voltage endurance capacity of the coil after pouring and curing reaches 15 kv or above, the coil is in a superconducting state at the temperature of 39 K, the high critical current density is achieved, and the coil can be used for manufacturing the magnet coil. And a relatively high magnetic field is generated, and the application prospect is wide.

The application relates to the technical field of sensors, and particularly discloses a magnesium-based metal ceramic sensitive element for a breathing pump and a preparation method thereof. The sensitive element is prepared by sintering a magnesium-based metal ceramic composition, and the raw materials include a magnesium-zinc-calcium medical magnesium alloy matrix phase, a dual-phase ceramic functional phase compounded by fluorophosphate calcium and magnesium boride, a low-temperature sintering fluxing compatible phase compounded by lithium fluoride and calcium fluoride, a potassium fluozirconate interface bridging modification component and a high-purity indium conductive stabilization component. The sensitive element is prepared through inert atmosphere raw material mixing, drying, powder pre-activation, cold isostatic pressing, double sealing and protection, stepwise low-temperature pulse discharge sintering, forming processing, surface passivation and working condition pre-stabilization treatment. The sensitive element is suitable for medical breathing pump sensing, has good conductivity, creep resistance and biocompatibility, and is suitable for high-frequency alternating working conditions; the preparation method is controllable, can realize low-temperature densification sintering, and guarantees the stability of the element structure and performance.

The present invention belongs to the technical field of superconducting wire materials, and discloses a magnesium diboride superconducting flat wire and a preparation method thereof. It includes: S1. Select a copper groove wire and a MgB2 round wire workpiece; S2. Tin-plate the copper groove wire, and then pass it through a U-shaped groove die to obtain a soft-state thin-walled copper groove wire; S3. Pass the soft-state thin-walled copper groove wire and the MgB2 round wire through a rectangular die at the same time for cold processing combination to obtain a nested structure MgB2 tin-plated flat wire; S4. Perform surface polishing and tin removal procedures on the nested structure MgB2 tin-plated flat wire, and only retain the tin-plated layer in the groove to obtain a MgB2 tin-removed flat wire; S5. Wind the MgB2 tin-removed flat wire on a steel wheel and place it in a heat treatment furnace for heat treatment to obtain a MgB2 superconducting flat wire. The present invention effectively solves the problems of poor bending resistance and poor mechanical properties of the MgB2 superconducting flat wire, and realizes that good current-carrying performance can still be maintained after repeated winding.

The present invention discloses a magnesium diboride superconducting wire and a preparation method thereof, belonging to the technical field of superconducting wire processing. The magnesium diboride superconducting wire is prepared by the in-situ powder-in-tube method and the central Mg diffusion method. A Mg rod is loaded into a pre-pressed B tube to obtain a Mg / B composite rod. The Mg / B composite rod is loaded into a Nb / Cu composite tube, and magnesium diboride superconducting powder is loaded into the gap region between the Mg / B composite rod and the Nb / Cu composite tube to prepare the magnesium diboride superconducting wire. During the heat treatment process, the Mg element in the central region diffuses towards the surrounding B element to form MgB2. At the same time, the MgB2 powder at the edge acts as a template to induce and promote the solid-phase reaction between the Mg element and the B element, generating a MgB2 superconducting phase with higher purity, so that the wire obtains higher current-carrying performance. The present invention provides a MgB2 wire with relatively excellent current-carrying performance under low-field application conditions.

The present invention relates to the field of aluminum alloy materials, and provides a high thermal conductivity aluminum profile for 5G base station radiators and a preparation process thereof, which is composed of a magnesium boride-coated diamond dual-scale reinforcement and aluminum alloy powder. The diamond dual-scale reinforcement is composed of micron-sized and nano-sized diamond particles, and the mass ratio is (5.0~8.0):1. The surface of the diamond dual-scale reinforcement is coated with a 15~30nm magnesium boride layer. The magnesium boride coating layer is prepared by electroless plating, and an Al3BC transition layer is formed in-situ in the aluminum alloy matrix through vacuum sintering to optimize the interfacial bonding. The third-order cold pressing forming, hot isostatic pressing sintering and two-pass hot extrusion processes are adopted to ensure the high density and excellent thermal conductivity of the material. The present invention effectively improves the thermal conductivity and mechanical properties of the aluminum profile, and is applicable to 5G base station radiators and high-efficiency heat dissipation fields.

The invention discloses a method for growing a small-diameter boron nitride nanotube and application of the small-diameter boron nitride nanotube. The method comprises the following steps: applying a catalyst to the surface of the substrate, wherein the catalyst is spatially separated from a boron source; and reacting the catalyst, the boron source, the nitrogen source and the functional carrier by adopting a chemical vapor deposition method to obtain the boron nitride nanotube growing on the substrate. According to the method, the boron nitride tube is grown in a manner of separating the catalyst from the boron source, so that melting agglomeration between magnesium boride catalysts at a high temperature and wrapping of the magnesium boride catalysts by the gaseous boron source are prevented to the greatest extent, the size change of the core catalyst is reduced, and the tube diameter of the boron nitride tube is regulated and controlled by controlling the size of the catalyst; and the obtained boron nitride nanotube integrates small diameter, high quality and directional assembly.

A magnesiumdiboride (MgB2) powder-in-tube (PIT) wire has a cross-section showing —voids, —magnesiumdiboride, and —oxides, as measured by energy-dispersive X-ray spectroscopy. Oxides are located at the borders between the voids and the magnesiumdiboride. The MgB2 PIT wire has a higher degree of superconductivity.

The invention belongs to the technical field of superconducting wires, and discloses a magnesium diboride superconducting flat wire and a preparation method thereof. Comprising the following steps: S1, selecting a copper slot wire and an MgB2 round wire machined part; s2, tin plating is conducted on the copper slot line, then the copper slot line passes through a U-shaped slot mold, and a soft thin-wall copper slot line is obtained; s3, the soft-state thin-wall copper slot line and the MgB2 round line pass through a rectangular mold at the same time, cold machining combination is conducted, and the MgB2 tinned flat wire of the nested structure is obtained; s4, respectively carrying out surface polishing and tin stripping links on the MgB2 tin-plated flat wire with the nested structure, and only reserving a tin-plated layer in a groove to obtain an MgB2 tin-stripped flat wire; and S5, winding the MgB2 tin-removed flat wire on a steel wheel, and carrying out heat treatment in a heat treatment furnace to obtain the MgB2 superconducting flat wire. The problem that an MgB2 superconducting flat wire is not resistant to bending and poor in mechanical property is effectively solved, and good current-carrying performance can still be kept after repeated winding.

The invention belongs to the field of nanomaterial technology, and discloses a method for preparing a nano-flaky 2D / 2D Cu2(OH)3X-B heterojunction composite material. First, 1mmol of 200-mesh magnesium boride powder is dispersed in 20-200mL of deionized water solvent; 1mmol of copper nitrate is fully dissolved in 20-200mL of deionized water, and then the above solution is poured into it, and 0.5-5mL of hydrochloric acid solution is added to accelerate the reaction process; 1mol of halogen source is added to form a halogen-substituted hydroxy copper halide, and after ultrasonication for 10mins, it is stirred for 3 days, filtered and centrifuged, and freeze-dried to obtain a gray-brown product. The 2D / 2D Cu2(OH)3X-B prepared by the present invention has a nano-flaky structure, and is uniform in size and has good dispersibility. It can be applied to the fields of optics, magnetism, catalysis, etc.

The invention discloses a magnesium-based solid electrolyte interface layer and a preparation method thereof. The magnesium-based solid electrolyte interface layer mainly comprises magnesium boride, and the mass ratio of the magnesium boride in the magnesium-based solid electrolyte interface layer is 20-80 wt.%; a boron-based compound precursor layer is pre-constructed on the surface of a magnesium metal negative electrode by adopting an interface precursor induced in-situ derivation method, and a magnesium-rich boride solid electrolyte interface layer is formed through in-situ conversion after electrochemical circulation; a boron-based compound precursor is subjected to ball milling pretreatment and then introduced into a pre-strain structure, boron elements are continuously released in the circulation process, formation of a magnesium-rich boride interface layer is promoted, the obtained interface layer can serve as a super-ion conductor interface for magnesium ion conduction, and rapid and uniform transmission of magnesium ions is achieved; meanwhile, the precursor in the strain state can also be used as a dynamic boron source storage cavern, continuously participates in interface reconstruction when the interface is damaged, and endows the interface with good self-repairing capability.

The invention relates to the technical field of environmental protection and new energy, and particularly discloses a Pd-loaded photo-thermal catalyst and a preparation method and application thereof, and the Pd-loaded photo-thermal catalyst comprises a rare earth hexaboride carrier and Pd nanoparticles; the preparation method of the Pd-loaded photo-thermal catalyst comprises the following steps: weighing anhydrous rare earth chloride and magnesium boride powder, grinding, uniformly mixing, calcining in vacuum, cooling to room temperature, soaking in a dilute sulfuric acid solution, stirring, centrifuging, washing and drying to obtain a rare earth hexaboride carrier; the preparation method comprises the following steps: adding a PdCl2 solution and a rare earth hexaboride carrier into water, stirring until the solution is completely evaporated to dryness, calcining, and reducing by using H2-Ar mixed gas to prepare the Pd-loaded photo-thermal catalyst. According to the photo-thermal catalyst, Pd nanoparticles are loaded on the surface of a rare earth hexaboride carrier, and the performance of catalyzing NO hydrogenation synthesis ammonia reaction by transition metal Pd is improved in a photo-thermal synergistic mode.

The invention discloses a preparation method of a magnesium diboride superconducting wire taking magnesium tetraboride as precursor powder. Magnesium tetraboride is synthesized through the thermal decomposition reaction of magnesium borohydride and boron powder, precious metal elements are doped in the magnesium tetraboride powder, a Mg rod is fixed to the center of an Nb tube on the basis of a center magnesium diffusion method, the space between the Mg rod and the Nb tube is filled with the precious metal-doped magnesium tetraboride powder, a single-core wire is prepared through cold machining, and after the two ends of the wire are flattened, the single-core wire is prepared into the high-strength magnesium alloy. And carrying out primary sintering in a tubular furnace to generate a magnesium diboride superconducting phase, bundling and stacking the primarily sintered wires, and carrying out secondary densification pressure sintering to obtain the magnesium diboride superconducting wire. The magnesium diboride superconducting wire prepared by the method is high in density and free of superconducting harmful phases, so that the magnesium diboride superconducting wire has good superconducting performance. The preparation method disclosed by the invention is simple, required equipment is relatively common, the cost is low, and the preparation method has very strong feasibility in the aspect of actual production and application.

This invention relates to the fields of environmental protection and new energy technologies, specifically disclosing a Pd-supported photothermal catalyst, its preparation method, and its application. The Pd-supported photothermal catalyst comprises a rare earth hexaboride support and Pd nanoparticles. The preparation method of the Pd-supported photothermal catalyst includes: weighing anhydrous rare earth chloride and magnesium boride powder, grinding and mixing them evenly, calcining them under vacuum, and after cooling to room temperature, immersing them in a dilute sulfuric acid solution and stirring, followed by centrifugation, washing, and drying to obtain the rare earth hexaboride support; adding PdCl2 solution and the rare earth hexaboride support to water, stirring until the solution is completely evaporated, calcining, and then reducing with a H2-Ar mixed gas to obtain the Pd-supported photothermal catalyst. This photothermal catalyst enhances the performance of the transition metal Pd in ​​the catalytic reaction of NO hydrogenation to ammonia synthesis through photothermal synergy by loading Pd nanoparticles onto the surface of the rare earth hexaboride support.

The invention relates to the field of aluminum alloy materials, and provides a high-thermal-conductivity 5G base station radiator aluminum profile and a preparation process thereof, and the high-thermal-conductivity 5G base station radiator aluminum profile is composed of a magnesium boride coated diamond dual-scale reinforcement and aluminum alloy powder. The diamond dual-scale reinforcement is composed of micron-scale and nano-scale diamond particles according to the mass ratio of (5.0-8.0): 1, and the surface of the diamond dual-scale reinforcement is coated with a magnesium boride layer of 15-30 nm. A magnesium boride coating layer is prepared through a chemical plating method, an Al3BC transition layer is formed in an aluminum alloy matrix in situ through vacuum sintering, and interface bonding is optimized. And by adopting three-order cold press molding, hot isostatic pressing sintering and two-pass hot extrusion processes, high density and excellent heat-conducting property of the material are ensured. The heat conductivity coefficient and the mechanical property of the aluminum profile are effectively improved, and the aluminum profile is suitable for the fields of 5G base station radiators and efficient heat dissipation.

The present invention discloses a microwave resonant cavity. The microwave resonant cavity of the present invention comprises a cavity and a film layer located on the surface of the inner wall of the cavity, and the film layer is made of a dielectric material capable of conducting heat. The internal film layer structure of the microwave resonant cavity of the present invention has a certain thermal conductivity, which can more effectively conduct the heat generated at the hot spot of the conductive wall to a low temperature away from the heating point, thereby reducing the maximum temperature rise at the hot spot, and further reducing the positive feedback effect caused by heat loss; the internal film layer is a dielectric, non-conductive, and has almost no interaction with the microwave electromagnetic field, so no additional heat loss is generated; thereby improving the overall operational stability of the microwave resonant cavity; the inner wall is coated with a dielectric film with stable chemical properties, which can also play a protective role. For example, magnesium boride is chemically unstable and easily decomposes when it comes into contact with water, and cannot be treated by high-pressure ultrapure water cleaning and other treatment methods. After adding a dielectric film, the inner wall of the resonant cavity can be protected.

The present invention discloses a method for preparing a black phosphorus / magnesium oxide quantum dot piezoelectric composite material, which specifically comprises the following steps: (1) grinding red phosphorus and magnesium boride to obtain a mixed powder; (2) dispersing the mixed powder in anhydrous ethanol, and then drying it to obtain a dried powder; (3) subjecting the dried powder to a high temperature treatment, and then cooling it to room temperature. The present invention slowly releases a single substance of Mg through MgB2, and a layered BP@MgO QD crystal can be prepared by a chemical vapor deposition method, wherein MgO is a quantum dot and exhibits obvious polarity, and can be applied to the fields of piezoelectric sensors and quantum technology.