10 results about "Magnesium diboride" patented technology

The application relates to a high-conductivity and high-activity Ir@TiO2 anode catalyst, a preparation method and application thereof in a proton exchange membrane electrolytic cell, and belongs to the technical field of inorganic functional catalyst materials. The iridium source and the titanium source are mixed at room temperature, a reducing agent magnesium diboride is added, the mass ratio of the magnesium diboride and the iridium source is 2:1, the mass ratio of the titanium source and the iridium source is 1-100:1; then the mixture is placed in a high-temperature and high-pressure reaction kettle, and is reacted at 80-200 DEG C for 10 min-4 h, and the high-conductivity, high-activity and easily enlarged Ir@TiO2 anode catalyst is obtained after being reduced to room temperature. The obtained Ir@TiO2 anode catalyst is dispersed in a mixed solution of water and ethanol with a volume ratio of 1:1, is prepared into slurry, is prepared into a membrane electrode through a coating means, and is assembled in a PEM electrolytic cell, and when the iridium load is 0.5 mg / cm 2 , the high activity and stability are still maintained.

The present invention discloses a powder loading device and method for preparing magnesium diboride superconducting wire using a central Mg diffusion method. The method comprises preparing two matching semicircular stainless steel troughs and four copper tubes, and forming closed grooves in each of the two semicircular stainless steel troughs. A copper tube is sleeved and fixed at one end of the semicircular stainless steel trough. One end of a niobium foil is pressed against the copper tube and spread over the inner wall of the stainless steel trough, with the niobium foil being pressed against the inner wall of the stainless steel trough. Another copper tube is fixed to the niobium foil at the other end of the stainless steel trough. Boron powder is filled and continuously compacted to form two semicircular boron powder grooves wrapped with niobium foil. A magnesium rod is inserted into the center of the two matching copper tubes, and a semicircular groove for the magnesium rod is pressed into the center of the boron powder in the semicircular groove. The two semicircular boron powder columns wrapped with niobium foil and with magnesium rod grooves are combined and inserted into a barrier sleeve serving as a barrier layer. After drawing and rolling, a uniform and dense single-core wire is produced. The present invention facilitates optimization of the tube loading process and is more conducive to automated tube loading.

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 relates to the technical field of bone repair, in particular to a magnesium diboride nano-enzyme with an ROS quenching effect and application of the magnesium diboride nano-enzyme. The invention provides a nano material MgB2 which is high in dehydrogenase-like activity, good in biological safety and excellent in chemical stability. The compound not only can scavenge free radicals in vitro, but also can efficiently scavenge free radicals in cells at the cellular level, and oxidative stress injury is reduced. The advantages can be expanded to the fields of multi-bone repair and bone regeneration.

The invention discloses a starch-based magnesium diboride mixture, a preparation method and application thereof, starch-based magnesium diboride gel and application thereof, the starch-based magnesium diboride mixture comprises soluble starch and magnesium diboride (MgB2), and the mass ratio of the soluble starch to the magnesium diboride is 1: (0.005-0.020). The material is simple in component and can be applied to repairing of stomach wounds and skin wounds.

The invention discloses a superhard superconductive B-C-N superhard material and a preparation method thereof, and belongs to the technical field of superhard materials, the superhard material comprises a three-dimensional interpenetrating composite structure composed of a superhard skeleton and a superconductive phase filled in the pores of the superhard skeleton; the superhard framework comprises a matrix formed by nano-twin diamond and lamellar cubic boron nitride embedded in the matrix, and a B-C-N ternary gradient transition layer exists at the interface of the nano-twin diamond and the cubic boron nitride area; the superconducting phase is magnesium diboride; the Vickers hardness of the superhard material ranges from 75.2 GPa to 82.1 GPa, and the superconducting transition temperature of the superhard material ranges from 35.8 K to 37.1 K; the mechanical property of a superhard material and the functional property of a superconducting material are perfectly fused into a whole, a comprehensive solution capable of replacing a traditional single-function material is provided, and the core problems that in the prior art, functions and performance are difficult to consider, and the service reliability of the material in an extreme environment is insufficient are effectively solved.

The flexible superconducting micro-coaxial cable is designed for use in quantum computing systems. The micro-coaxial cable includes an inner conductor made of a first superconductive material, surrounded by a dielectric layer. Circumferentially surrounding the dielectric layer is a braided outer conductor, made of a second superconductive material, providing more than 90% coverage. The first and second superconductive materials can be either type-I superconductors, such as Aluminum(Al), Lead(Pb), Titanium(Ti), Indium(In), and Tin(Sn), or type-II superconductors, including magnesium diboride(MgB2), niobium-titanium(NbTi), niobium-tin(Nb3Sn), and niobium-germanium(Nb3Ge).

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.

The flexible superconducting micro-coaxial cable is designed for use in quantum computing systems. The micro-coaxial cable includes an inner conductor made of a first superconductive material, surrounded by a dielectric layer. Circumferentially surrounding the dielectric layer is a braided outer conductor, made of a second superconductive material, providing more than 90% coverage. The first and second superconductive materials can be either type-I superconductors, such as Aluminum(Al), Lead(Pb), Titanium(Ti), Indium(In), and Tin(Sn), or type-II superconductors, including magnesium diboride(MgB2), niobium-titanium(NbTi), niobium-tin(Nb3Sn), and niobium-germanium(Nb3Ge).