The metal niobium can be prepared by electrolytic melting of potassium sevoflurate, or by reducing potassium sevoflurate by sodium metal or niobium pentoxide by reducing aluminum metal. Pure niobium is used in vacuum tube to remove residual gas. Niobium doped in steel can improve the oxidation resistance of steel at high temperature and improve the welding performance of steel. Niobium is also used to make high-temperature cermet.
Niobium tube and niobium alloy tube have the characteristics of high melting point, corrosion resistance, good cold working performance, etc. They are mainly used as the structural material of high pressure sodium lamp, aviation and aerospace engine, chemical process reaction vessel, heat exchanger tube, reactor internal element and cladding material, etc. Niobium-zirconium alloy was made into capillary supply sodium lamp manufacturing industry.
Niobium and niobium alloy bars and wires are widely used in chemical, electronic, aerospace and other fields due to their high melting point, corrosion resistance and good cold working performance. Niobium and niobium alloy bars are used as structural materials and rocket nozzles for aircraft engines, as internal components and cladding materials for reactors, and as various corrosion resistant components under conditions of nitric acid, hydrochloric acid or sulfuric acid. Niobium and niobium alloy wire are widely used to make high pressure sodium lamp and anode lead of electrolytic capacitor.
A preparation method of high-purity niobium tube for multi-drawing molding includes the following steps: Step 1: Select high-purity niobium plate with RRR value greater than 330 to sanding and polishing its surface, and clean the surface of the plate; Step 2: Cut round according to the size of high-purity niobium pipe, and remove burr after cutting; Step 3: Install multiple forming molds on the pressure machine, insert the high-purity niobium circular plate with circular cutting into the multiple forming molds, start the press machine to complete the first stretch forming, and realize demodulation through the press machine's return trip force, and take out the high-purity niobium tube after one forming; Step 4: Install the multi-forming mold again on the pressure machine, load the high-purity niobium pipe after the first drawing into the multi-forming mold, start the press machine to complete the second drawing, and realize demodulation through the press machine's return trip force, and take out the high-purity niobium pipe after the second forming; Step 5: After cutting the flat of the high-purity niobium tube after secondary forming, pickling, and then high vacuum heat treatment of the high-purity niobium tube after pickling, is obtained.
