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Characteristic
Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. Tungsten is a rare metal found naturally on Earth almost exclusively combined with other elements in chemical compounds rather than alone. Its important ores include wolframite and scheelite.
Phase at STP：solid
Appearance：grayish white, lustrous
Melting point：3695 K (3422 °C, 6192 °F)
Boiling point：6203 K (5930 °C, 10706 °F)
Density (near r.t.)：19.3 g/cm3
when liquid (at m.p.)：17.6 g/cm3
Heat of fusion：52.31 kJ/mol
Heat of vaporization：774 kJ/mol
Molar heat capacity：24.27 J/(mol·K)
Application
Approximately half of the tungsten is consumed for the production of hard materials – namely tungsten carbide – with the remaining major use being in alloys and steels. Less than 10% is used in other chemical compounds. Because of the high ductile-brittle transition temperature of tungsten, its products are conventionally manufactured through powder metallurgy, spark plasma sintering, chemical vapor deposition, hot isostatic pressing, and thermoplastic routes. A more flexible manufacturing alternative is selective laser melting, which allows creating complex three-dimensional shapes.
Characteristic
Tungsten, or wolfram, is a chemical element with the symbol W and atomic number 74. Tungsten is a rare metal found naturally on Earth almost exclusively combined with other elements in chemical compounds rather than alone. Its important ores include wolframite and scheelite.
Phase at STP：solid
Appearance：grayish white, lustrous
Melting point：3695 K (3422 °C, 6192 °F)
Boiling point：6203 K (5930 °C, 10706 °F)
Density (near r.t.)：19.3 g/cm3
when liquid (at m.p.)：17.6 g/cm3
Heat of fusion：52.31 kJ/mol
Heat of vaporization：774 kJ/mol
Molar heat capacity：24.27 J/(mol·K)
Application
Approximately half of the tungsten is consumed for the production of hard materials – namely tungsten carbide – with the remaining major use being in alloys and steels. Less than 10% is used in other chemical compounds. Because of the high ductile-brittle transition temperature of tungsten, its products are conventionally manufactured through powder metallurgy, spark plasma sintering, chemical vapor deposition, hot isostatic pressing, and thermoplastic routes. A more flexible manufacturing alternative is selective laser melting, which allows creating complex three-dimensional shapes.
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