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Tantalum Toughness Is Very Strong
Sep 25, 2017

Tantalum, metal elements, mainly in tantalite, Tantalum with niobium symbiosis. Tantalum hardness is moderate, rich ductility, can be drawn into thin filament thin film. Its thermal expansion coefficient is very small. Tantalum has a very good chemical properties, Tantalum with high corrosion resistance. Whether in cold and hot conditions, hydrochloric acid, concentrated nitric acid and "aqua regia" do not respond. Can be used to make evaporative containers, etc., can also do the tube electrode, rectifier, electrolysis, Tantalum capacitance. Medical used to make thin slices or thin lines, sew the damaged organization. Although the corrosion resistance of tantalum is very strong, but its corrosion resistance is due to the surface of the stable tantalum pentoxide (Ta2O5) protective film.

Chemical symbol Ta, Tantalum steel gray metal, in the periodic table is a VB family, atomic number 73, atomic weight 180.9479, body-centered cubic crystal, the common parity is +5.

Tantalum was discovered by the Swedish chemist Ekeberg in 1802, named after the Greek mythology Tantalus (Tantalus) named tantalum. 1903 German chemist Bolton (W.von Bolton) for the first time the preparation of plastic metal tantalum used as filament material. 1940 large-capacity tantalum capacitors appear, and widely used in military communications. During the Second World War, Tantalum the demand for tantalum increased dramatically. Since the 1950s, the application of tantalum in capacitors, superalloys, chemical and atomic energy industry has been expanding, the demand has increased year by year, and the research and production of tantalum extraction technology have been promoted. Tantalum China established the tantalum metallurgical industry in the early 1960s.

Tantalum hardness is low, and with the oxygen content, ordinary pure tantalum, annealed Vickers hardness of only 140HV . Its melting point of up to 2995 ℃, in the elemental [1], Tantalum second only to carbon, tungsten, rhenium and osmium, ranked fifth. Tantalum is highly ductile and can be drawn into thin filaments. Its thermal expansion coefficient is very small. Tantalum Each rose one degree Celsius only expansion of 6.6 points per million. In addition, its toughness is stronger than copper.

Tantalum also has a very good chemical properties, Tantalum with a high degree of corrosion resistance, whether in cold and hot conditions, hydrochloric acid, concentrated nitric acid and "aqua regia" do not respond. But tantalum in the hot concentrated sulfuric acid can be corroded at 150 ℃ below, tantalum will not be concentrated sulfuric acid corrosion, only at this temperature will react, Tantalum in the 175 degrees of concentrated sulfuric acid in 1 year, Tantalum the corrosion of the thickness 0.0004 mm, the tantalum into 200 ℃ sulfuric acid soak for one year, the surface damage only 0.006 mm. At 250 degrees, the corrosion rate increased for the corrosion of the annual thickness of 0.116 mm, at 300 degrees, the corrosion rate is faster, soaking for 1 year, Tantalum the surface was corrosion 1.368 mm. In the fuming sulfuric acid (containing 15% SO3) corrosion rate is more serious than concentrated sulfuric acid, 130 degrees in the solution soak for 1 year, the surface corrosion thickness of 15.6 mm.





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