Tantalum and tantalum alloy sheet, strip and foil are high temperature resistant and corrosion resistant materials. Its chemical stability is similar to that of glass. Its strength and stiffness are comparable to those of low carbon steel. Its high temperature thermal strength is second only to tungsten and tungsten alloys. It is an excellent material for chemical anticorrosion and high temperature furnace. Tantalum reacts strongly with oxygen, hydrogen and nitrogen in air from 300 degrees to form brittle compounds, which increase the hardness of metal and decrease its brittleness, and have a great influence on the plastic-brittle transition temperature of it.

   Tantalum foil process and heat treatment

   Tantalum ingot by electron beam melting - room temperature (or less than 400 degrees) forging billet - annealing - rough rolling - annealing - strip rolling - annealing - foil rolling - heat treatment

   1; forging requirements

   It is best to use forging press cold forging for forging billet, the forging temperature is not higher than 400 degrees. The cold forging has large contact surface and good material uniformity, which can reduce the pollution of gas impurities.

   2: rolling requirements:

   Usually cold rolling is used, the total processing rate is controlled at 80% - 90% of the slab thickness, and the pass processing rate is controlled at 6% - 8% of the slab thickness. In order to ensure the surface quality of rolling plate, it is required that the forged slab has no defects, pollution and smooth roll surface.

   3: clear requirements:

   Before annealing, tantalum must be pickled to remove the surface contamination layer. The pickling solution is made up of 65%-68% nitric acid, 95%-98% sulfuric acid and hydrofluoric acid with a volume ratio of 5:5:2. After pickling, it is washed with water.

    Process performance and requirements

    1: formability

  Tantalum has good plasticity and can be processed by cold forging, rolling, punching, drawing, spinning, extrusion and bending. Hot processing needs to be carried out under inert gas protection. After producing oxide film on the surface of its high performance strip, it can be continuously deep washed for six times and processed into a round cup body.

   2: heat treatment process

  Heat treatment was carried out under vacuum and 1200-1300 degree. The holding time is determined according to the loading amount and thickness of the material, and the foil can not be stacked during recrystallization annealing.

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