2 results about "Vacuum fusion" patented technology

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.