6 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.

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 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 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.