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13 wrz 2024 · tungsten (W), chemical element, an exceptionally strong refractory metal of Group 6 (VIb) of the periodic table, used in steels to increase hardness and strength and in lamp filaments. Tungsten metal was first isolated (1783) by the Spanish chemists and mineralogists Juan José and Fausto Elhuyar by charcoal reduction of the oxide (WO 3 ...
Physical properties. In its raw form, tungsten is a hard steel-grey metal that is often brittle and hard to work. Purified, monocrystalline tungsten retains its hardness (which exceeds that of many steels), and becomes malleable enough that it can be worked easily. [18] .
Tungsten has the highest melting point of all metals and is alloyed with other metals to strengthen them. Tungsten and its alloys are used in many high-temperature applications, such as arc-welding electrodes and heating elements in high-temperature furnaces.
8 gru 2019 · Tungsten is a dull silver-colored metal with the highest melting point of any pure metal. Also known as Wolfram, from which the element takes its symbol, W, tungsten is more resistant to fracturing than diamond and is much harder than steel.
Tungsten is a very hard, dense, silvery-white, lustrous metal that tarnishes in air, forming a protective oxide coating. In powder form tungsten is gray. The metal has the highest melting point of all metals, and at temperatures over 1650 o C also has the highest tensile strength.
Chemical Characteristics. Tungsten is not very reactive metal. It does not react with oxygen at room temperature. It also resists attacks by acids and alkalis. The most common oxidation state of tungsten is +6 but it exists in all oxidation states from -2 to +6. In powdered form, tungsten reacts with carbon to produce tungsten carbide upon heating.
25 lut 2024 · Tungsten is a hard, steel-gray to white metal that is brittle at lower temperatures but ductile and malleable upon heating. It has the highest melting point of all metals and the second highest of all elements after carbon.
