astm grade 5 titanium
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» About Tantalum
» Tantal - Tantale
Niobium was discovered in a black mineral from America called columbite by the British chemist and manufacturer Charles Hatchett (London, England) in 1801 and he called the element columbium. In 1809, the English chemist William Hyde Wollaston claimed that columbium and tantalum were identical. Forty years later, the German chemist and pharmacist, Heinrich Rose, determined that they were two different elements in 1846 and gave the name niobium because it was so difficult to distinguish it from tantalum. Finally, in 1866, the Swiss chemist Jean-Charles Galissard de Marignac separated these elements. The name columbium continued to be used in America and niobium in Europe until IUPAC adopted the name niobium in 1949. Niobium was first isolated by the chemist C. W. Blomstrand in 1846. (APSIDIUM)
Tantalum, a refractory metal, combines excellent corrosion resistance, strength, and a high melting point with exceptional fabrication and machining qualities. These unique qualities allow Tantalum to serve many diverse industries including: aerospace, chemical processing, electronics, and, defense.
Fabricating and Machining - Annealed Tantalum works similarly to mild steel and machines similar to soft copper. It can be rolled, formed, drawn, or, swaged.
Corrosion Resistance - Tantalum is immune to attack by most acids and other molten metals. Only hydrofluoric acid, fuming sulfuric acid, or strong alkalis can corrode Tantalum.
High melting point (2996°C) Tantalum's strength at high temperatures, together with its ease of fabrication, make it a superior material for heating elements, heat shields, and other components in high-vacuum furnaces.