6 results about "Vacuum fusion" patented technology

The invention relates to the technical field of preparation of high-purity boron oxide, and discloses a purification method of high-purity boron oxide and a device thereof, and the purification method comprises the following steps: step 1, mixing crude boron oxide with a liquid metal alloy, and dissolving metal impurities through gradient temperature control; 2, applying ultrasonic treatment to the mixed system, introducing a vortex field, and stripping impurities on the surface of the boron oxide; 3, a liquid metal phase and a boron oxide solid phase are separated through cooperation of a magnetic field and a pulse high-voltage electrostatic field; 4, non-metal ion impurities are removed through a gradient porous ceramic adsorption bed; and step 5, melting boron oxide in vacuum and carrying out gradient cooling crystallization. By adopting the technical scheme of a Ga-I n-Bi-Er quaternary liquid alloy system, the technical effect of selective targeted removal of metal impurities is achieved, and compared with a liquid metal system depending on single phase solubility difference in the prior art, the defect that efficient chelating and dynamic settling separation of the impurities cannot be achieved at the same time is overcome.

The invention discloses an oxygen-free copper alloy rod and a preparation method thereof, the alloy rod comprises an oxygen-free copper matrix, an element Cr, an element Zr and an element Ag, the content of the element Cu in the oxygen-free copper matrix is greater than or equal to 99.95 wt.%, the oxygen content is less than or equal to 5 ppm, the content of the element Cr is 0.1-0.3 wt.%, the content of the element Zr is 0.05-0.15 wt.%, and the content of the element Ag is 0.01-0.1 wt.%. The preparation process comprises the steps of vacuum melting, stirring, continuous casting and continuous rolling integrated machining and gradient aging treatment. According to the invention, the performance is synergistically improved through component optimization and process innovation, and the preparation process has uniqueness and unexpected technical effects, so that the defect that the strength and the conductivity cannot be balanced in the prior art is overcome. And the tensile strength is greater than or equal to 450Mpa while the electric conductivity is greater than or equal to 95% IACS.

The utility model discloses a vacuum melting ingot furnace for ingot casting of high-purity reduced germanium powder. The vacuum melting ingot furnace comprises a furnace body, a furnace cover, a vacuum pump and a graphite boat bracket, the furnace cover is arranged on the furnace body, the furnace cover is provided with a water circulating pipeline, and the furnace cover is provided with a discharge pipeline and a pressure gauge; the furnace body is a hollow cylinder, a vacuum hearth is arranged in the furnace body, the furnace body is provided with an exhaust pipe, and the exhaust pipe is connected with a vacuum pump; and a heating resistance tape is arranged around the furnace body and is wound into a corrugated shape. By means of the reasonable structural design, the reduction germanium powder can be fully subjected to melting ingot casting, the single efficiency is greatly improved, meanwhile, the power consumption is reduced, and the production time is shortened. A plurality of graphite boats and supports thereof are placed in the vacuum hearth, so that the efficiency of single ingot casting is improved, and electric energy is saved.

The invention discloses a high-temperature vacuum molten salt environment rotating friction wear test system, and belongs to the technical field of molten salt test equipment, the high-temperature vacuum molten salt environment rotating friction wear test system comprises a base, a rotary furnace and a vacuum melting chamber, the base is internally provided with a power device, and the power device is in transmission connection with the rotary furnace, so that the rotary furnace rolls along the inner side wall of the rotary furnace; a vacuum melting chamber is rotationally arranged at the axis of the self-rotating furnace, and the vacuum melting chamber is in coupling transmission connection with the self-rotating furnace, so that the self-rotating furnace also rotates in the rolling process, and according to the angular momentum conservation principle, after a power system is stable, the vacuum melting chamber can obtain a high rotating speed; meanwhile, the accompanying sealing cover is fixed with the self-rotating furnace in a sealing manner and moves along with the self-rotating furnace, so that the current passes through the turning cover and the accompanying sealing cover to form a loop, an electric arc is formed in the vacuum melting chamber, molten salt can be heated by the electric arc, the electric arc and a test pipe sample in the vacuum melting chamber mutually rotate and rub, and finally an accurate test result is obtained.

The application relates to the technical field of heat storage and energy storage, and discloses a heat storage and energy storage molten salt material and a preparation method and application thereof, the method comprises raw material pretreatment, molten salt system preparation, additive modification, vacuum melting treatment, step cooling and heat treatment, and crushing and screening; by adding nano-aluminum oxide and carbon nanotubes as the additives into a ternary basic molten salt mixture, the thermal conductivity and the thermal stability of the molten salt material are improved, meanwhile, the introduction of nucleating agents promotes the uniformity of molten salt crystallization, so that the phase change latent heat and the recycling service life of the material are enhanced, and the reliability of the heat storage and energy storage performance is ensured; the preparation process of vacuum melting treatment combined with step cooling and heat treatment is adopted, bubbles and impurities in the molten salt are removed, the high purity and the compactness of the microstructure of the material are ensured, and by controlling the cooling rate and the heat preservation and ripening process, the crystal structure of the molten salt is optimized, and the thermal stability and the use temperature range of the material are improved.

The application discloses a method for preparing high-purity germanium ingot by reducing germanium powder vacuum melting and casting ingot, which comprises the following steps: first, cleaning and loading the graphite boat; second, vacuumizing; third, passing in nitrogen containing 1% hydrogen; fourth, heating and melting and casting ingot; fifth, cooling; sixth, continuously passing in high-purity nitrogen, and waiting for the furnace body to restore normal temperature and pressure; seventh, taking out the material from the furnace. The high-purity reduced germanium powder is cast into ingot in a high-temperature ingot casting furnace under a vacuum nitrogen protection atmosphere, so that a large amount of hydrogen is avoided, production cost and safety risk are reduced, production efficiency is improved, and production cost is reduced.