ZLX Tech | Tantalum

Special formed

Tantalum

Formula: Ta

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Item no.: 931073

Inquiry

Tantalum is a greyish silver, heavy, and very hard metal. When pure, it is ductile and can be drawn into fine wire, which can be used as a filament for evaporating metals such as aluminium. Tantalum is almost completely immune to chemical attack at temperatures below 150°C, and is attacked only by hydrofluoric acid, acidic solutions containing the fluoride ion, and free sulphur trioxide. The element has a melting point exceeded only by tungsten and rhenium. Tantalum is available in many forms including foil, sheet, wire, plate, rod, powder and other various forms.

Tantalum metal has a number of important uses. It is used to make steels with desirable properties such as high melting point, high strength, good ductility. These find use in aircraft and missile manufacture. It is very inert and so useful in the chemical and nuclear industries to line reactors. Tantalum wires were those used first for light bulbs (now tungsten is preferred). The metal is immune to body liquids and the body tolerates the metal well. Therefore, tantalum has widespread use for surgical use. For instance, it can be used in sutures and as cranial repair plates. The metal is used in the electronics industry for capacitors.

[Bohr Model of Tantalum]

Atomic Volume: 10.9 W/D
Boiling Point: 5429°C
Covalent Radius: 1.34 Angstroms
Crystal Structure: Cubic, body centered
Density: 16.69 g/cm³
Electrical Resistivity (20°C):13.5 μΩ-cm
Electronegativity: 1.5Pauling's
First Ionization Energy:138K-cal/g-mole
Heat of Fusion: 6.80 k-cal/g-atom
Heat of Vaporization: 180K-cal/g-atom
Linear Conefficient of Expansion: 6.5x10^-6K
Magnetic Susceptibility: 0.93x10^-6cgs
Melting Point: 2996°C
Specific Heat (20°C): 0.036cal/g°C
Tensile Strength (20°C): 35-70x10³psi
Thermal Conductivity: 0.130 cal/cm²/s/°C
Thermal Neutron Cross Section: 21.3barns/atom
Thermionic Work Function: 4.12eV
Vapor pressure (1727°C): 9.5x10^-11atm
Young's Modulus (20°C): 27x10⁶psi

Applications

Tantalum finds use in four areas: high-temperature applications, such as aircraft engines; electrical devices, such as capacitors; sirurgical impants and handling corrosive chemicals. It is rarely used as an alloying agent because it tends to make metals brittle. Tantalum resist corrosion and is almost impervious to chemical attack, for this reason it has been employed in chemical industry, e.g. for heat exchanger in boilers where strong acids are vaporized.

Tantalum in the environment

Because Tantalum oxide is very insoluble, there is almost no Tantalum to be found in natural waters. Few attemps have been made to measure its level in soils, revealing a range from 0.1 to 3 ppm. Only tiny amounts of Tantalum are taken by plants: the amount in vegetation rarely exceeds 5 ppb.

The chief Tantalum ores are tantalite, which also contains Iron, Manganese and Niobium, and samarskite, which contains seven metals. Another ore which contains Tantalum and Niobium is pyrochlore. The main mining areas are Thailandia, Australia, Congo, Brazil, Portigal and Canada. The demand of Tantalum is about 2300 tonnes a year. No assessment of total reserves of extractable metal have been reliably calculated.

Health effects of Tantalum

May be harmful by inhalation, ingestion or skin absorption. Causes eye & skin irritation. Material is irritating to mucous membranes & upper respiratory tract.

There are no reports of adverse Health effectsin industrially exposed workers. Massive doses of Tantalum given by intratracheal route to rats have produced respiratory tract lesions. In contact with tissue, metallic Tantalum is inert.

Environmental effects of Tantalum

Do not allow material to be released to the environment without proper governmental permits.

Isolate runoff of Tantalum oxide to prevent Environmental pollution.

Inquiry

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