50 results about "Magnesium boride" patented technology

A method of synthesizing a superconducting material, comprising mixing starting materials comprising magnesium, boron, silicon and carbon; heating the mixture of starting materials to a temperature in the range between 650° C. and 2000° C. to produce a material comprising magnesium boride doped with silicon carbide; and cooling the resulting material to a temperature below the critical temperature of the material to render the material capable of superconducting.

The preparation process of magnesium diboride superconductor features that magnesium diboride superconductor is prepared in strong magnetic field. Magnesium powder and boron powder in stoichiometric ratio are mixed homogeneously, the mixture is prepared into lump or belt sample, and the lump or belt sample is set heating furnace with Ar atmosphere and strong magnetic field and maintained at magnetic field of 0-30 tesla and temperature of 600-950 deg.c for 1-3 hr before the power source for the strong magnetic field and heating is turned off and the sample is cooled to room temperature inside the furnace. The present invention has effectively improved crystal grain connectivity and greatly raised clinical current structure of the magnesium diboride superconductor.

The invention relates to a nano-scale catalytic metal-ceramic bonding firing-free bitumen-impregnation-free environment-friendly slide plate and a preparation method thereof. The invention relates to the firing-free bitumen-impregnation-free environment-friendly slide plate and the process thereof. The invention relates to the field of a refractory material. The material comprises the raw materials of 25-40% granular first-grade alumina, 15-25% of tabular corundum, 6-12% of mullite, 6-15% of silicon carbide fine powder, 0.5-1% of clay, 0.5-2% of magnesium boride, 6-10% of zircon sand, 2-5% of aluminum powder, 1-3% of carbon black, 0.5-1.5% of boron carbide, 3-10% of alumina micro-powder, 0.5-1.5% of aluminum fiber, 1-3% of nano-powder ferrosilicon, 1-3% of iron silicon nitride, and 4-6% of a composite resin binder. The process comprises the following steps: resin, polycarboxylic acid and nano-powder are mixed to prepare the composite resin binder; the granular materials are dry-mixed; premixed powder and the binder are added; and mix grinding, aging, molding, drying, strapping, grinding, shell-applying, and packaging are carried out. The process does not require a firing step, such that energy is saved; and bitumen impregnation is not required, such that pollution is avoided. When the slide plate is applied in a continuous-casting large ladle, the slide plate can be used for continuous sliding more than 4 times. The slide plate can also be used in converter slag stopping.

The invention provides a method for manufacturing a magnesium boride superconductive belt material. The method comprises the following steps: A, uniformly distributing amorphous boron on a conductive substrate by adopting a coating method to form an amorphous boron layer with thickness of between 0.1 and 2.0mm; B, covering a magnesium or magnesium alloy flake with thickness of between 0.1 and 2.0mm on the boron layer, and rolling to form a magnesium-boron-substrate combination; C, putting the combination in the step B in a thermal treatment furnace, under the protection of argon atmosphere, heating to the temperature of between 550 and 800 DEG C, preserving the temperature for 0.1 to 3 hours, and cooling; D, coating metal, metallic oxide, silicon carbide or diamond like carbon film on thecombination which is treated in the step C to serve as a protective layer to form a composite body; and E, cutting the composite body in the step D into long belts. The MgB2 superconductive belt prepared by the method has the advantages of good compactness and grain connection, high critical current density, uniform current density distribution and high fatigue life, and is suitable for commercial application. The method is simple, and is suitable for industrial production.

The invention relates to a method for preparing a magnesium boride superconducting line and belt material. The preparation method is that a. preparation of precursor powder: high magnesium diboride MgBx powder is taken as the precursor powder, wherein, x is more than or equal to 4 and less than or equal to 12; or magnesium powder and amorphism boron powder are mixed according to 1:3-20 of stoichiometric ratio between magnesium and boron to form the precursor powder; b. putting into a magnesium pipe: the precursor powder is put into a magnesium pipe, compacted and sealed; c. putting into a canning pipe: the magnesium pipe is put into a metal canning pipe and is sealed after the metal canning pipe is fully filled with metal powder as a barrier layer; or the magnesium pipe is first put into a barrier layer metal pipe and then is put into the metal canning pipe and the metal canning pipe is sealed; d. moulding treatment: the metal canning pipe is produced into line and belt material; e. heat treatment: the metal canning pipe is put into a pipe typed furnace and under the protection of argon, the temperature is raised to 700-1200 DEG C by the speed of 1-10 DEG C / minute, preserved for 1-30 hours and then cooled to room temperature. The MgB2 superconducting line and belt material prepared by the method has high compactability, good grain connectivity and even cross section.