2 results about "Polycrystalline copper" patented technology

The invention discloses a preparation method of a polycrystalline-to-single crystal copper foil through efficient hydrogen enhanced etching. The preparation method comprises the following steps: 1, sequentially soaking a rolled polycrystalline copper foil in an acid solution of acetone and an acid solution of absolute ethyl alcohol; 2, ultrasonically cleaning the copper foil in deionized water, and blow-drying the surface by adopting inert gas; 3, cutting the rolled polycrystalline copper foil into a regular shape, flatly laying the rolled polycrystalline copper foil on the quartz plate, repeating the step, putting the quartz plate into the tubular furnace, and ensuring that oxygen in a pipeline is completely removed; 4, under the normal pressure, inert gas output is kept in the tubular furnace, a temperature rising program is set, hydrogen is introduced when the temperature reaches the copper foil annealing temperature, and finally high-quality single crystal Cu (111) is stably obtained; the method has the advantages that a traditional electrolytic copper foil preparation link is completely omitted, the hydrogen etching time is prolonged in a CVD tubular furnace under normal pressure, the hydrogen flow is increased, selective etching of hydrogen to grain boundary high-energy defects is enhanced, abnormal growth of grains and thorough swallowing of the grain boundary are promoted, and the large-area single crystal Cu (111) with the single crystal rate larger than 99% is obtained.

The application provides a wide-temperature-range super-elastic polycrystalline copper-aluminum-manganese alloy additive manufacturing method, which comprises the following steps: step 1, pretreating copper-aluminum-manganese raw materials; step 2, weighing the required mass of the pretreated copper-aluminum-manganese raw materials according to a fixed component proportion; step 3, electric arc smelting the copper-aluminum-manganese raw materials after component proportioning to obtain copper-aluminum-manganese alloy ingots; step 4, atomizing the copper-aluminum-manganese alloy ingots to obtain copper-aluminum-manganese alloy powder; step 5, 3D printing and in-situ secondary melting the copper-aluminum-manganese alloy powder, and wire cutting the copper-aluminum-manganese alloy sample after printing; and step 6, stress relief heat treatment of the copper-aluminum-manganese alloy sample to obtain a polycrystalline copper-aluminum-manganese alloy. The application can prepare a polycrystalline copper-aluminum-manganese alloy with excellent super-elasticity without solid solution treatment through component design and laser additive manufacturing method, and the alloy has controllable morphology, small grain size, uniform composition and favorable texture, and has large super-elastic strain and complete reverse phase transition.