Pipe, rod, bar, wire made from tantalum
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Physical and chemical properties
Tantalum is a metal of grey-steely color with a blueish tint. It is resistant in air at standard conditions. It starts oxidizing at a temperature higher than 200 °C. The main property is its capability to occlude oxygen, nitrogen, hydrogen which inconspicuous additives influence on mechanical and electric characteristics. At standard conditions, tantalum occludes hydrogen slowly. With a temperature rise, occluding speed increases. Upon reaching 500 °C, there is noticed maximum occluding speed — when not only adsorption proceeds but hydride formation as well. Occluded hydrogen gives brittleness to metal. But during heating of more than 600 °C in vacuum, almost all H2 starts evolving and there is occurred a recovery of former characteristics.
Physical properties of Ta
|Atomic (molar) weight mole/h||180.9|
|Melting heat kJ/mole||24.7|
|Heat conductivity K [V/m*K]||57.5|
|Evaporation heat kJ/mole||758|
Tantalum occludes nitrogen up to 600 °C. When temperature is higher than 600 °C, there forms tantalum nitrite that has a melting point of 3087 °C. As long as tantalum is slightly resistant to alkalis, it is bitten by hot solutions of caustic soda and sodium carbonate. In melted alkalis, it starts forming salts of tantalum acid.
|Tantalum, not less than||99.9||99.92||99.96||99.9|
For the first time, tantalum was applied in manufacture of glowing filament at the turn of XXth century. But it was substituted with tungsten lamps. Application of this metal in XXI century is directly connected with a development of radiotechnical, radar, X-ray equipment. Tantalum affinity to gas occlusion conduces to deep vacuum holding. Emission capability, refractory quality, and capability to gas adsorption define its application for manufacture of parts for electronic tubes.
Tantalum coverings have attractive look as well as nickel and chromium. There is invented a method of tantalum applying in such large products as pipe, sheets, billets, rocket nozzles etc. An interesting fact: Brinell hardness of tantalum covering constitutes 180−200 kg/mm2. Strength of engineering tantalum in the form of sheet or annealed bar constitutes 50−80 kg/mm2. Tantalum carbide along with tungsten is unparalleled material for drilling of strongest rocks by percussive method. It is also indispensable for metal processing of tool steel.
Tantalum is utilized in manufacture of ammunition: in the capacity of metal jacketing for hollow-charge armor-piercing projectiles. Nowadays, air-space techniques cannot do without tantalum beryllide as far as it is very hard and resistant to oxidizing. ТаО5 additive to glass is applied in experimental physics and nuclear energetics. Such glass hinders gamma-rays.
Tantalum is also used for manufacture of high-capacity condensers and current rectifiers. In such condensers, there are used tantalum tablets obtained by powder metallurgy method. They are baked and pressed at high temperatures. Active surface of porous surface increases twice as much. It gives a possibility to obtain small condenser dimensions at high capacity. Such condensers are also applied in combat radio set as long as they can operate in the most extreme condition at a temperature of -80 +200°С. Recently, tantalum has become one more jewelry metal because it can form a hard oxide film of different colors on a surface.
Tantalum pipe, rod supplier
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