วันอาทิตย์ที่ 11 กันยายน พ.ศ. 2554

10 Things You Need To Know About The Metal Tungsten by Steven

Tungsten is an element represented on the periodic table by the W symbol and has an atomic number of 74. Ever wonder why tungsten's symbol is W? Well, this element is known by many as wolfram, which better coincides with the representative symbol. Yet, there is still a great deal more that you probably want to know about this interesting element. Read on to find out ten facts you should know about tungsten. It won't hurt…we promise.
1.Tungsten is a grayish white fairly lustrous metal that occurs on Earth naturally, but in chemical compounds only.

2.Carl Wilhelm Scheele located tungstic acid in 1781 when he found that it could be created from scheelite. He conferred with Torbern Bergman and the duo suggested that a new metal may be possible if this acid were reduced. Two years later, brothers Fausto and Jose Elhuyar discovered an acid that was produced from wolframite and identical to the tungstic acid discovered by Scheele. Later in the year, this duo was able to use charcoal to reduce the acid, making them successful in the isolation of tungsten. Therefore, the Elhuyar brothers were credited with tungsten's discovery.
3.Tungsten's name originates from the Nordic words for heavy stone," tung sten". This name is widely used in several languages, including English and French. However, wolfram is normally used in Slavic, German and most other European languages. This is derived from wolframite, which is a mineral and was the name that Johan Gottschalk Wallerius gave to tungsten in 1747.
4.In its raw form, tungsten is a brittle metal that is difficult to work; however, if the metal is pure, it will be remarkably more workable. Tungsten is worked using drawing, extruding, forging or sintering.
5.Of all pure form metals, tungsten's melting point is the highest at 3422 degrees Celsius, as is its tensile strength. Its vapor pressure is the lowest of all metals and it has the lowest thermal expansion coefficient of all pure metals.
6.Tungsten is resistant to attacks made by acids, alkalis and oxygen. This metal's resistance properties make it extremely desirable.
7.Tungsten can be found in four main minerals: ferberite, hubnerite, scheelite and wolframite.
8.In 2009, the majority of the world's tungsten output was produced by China at 51,000 tons. That represented 83% of worldwide production. The remainder of tungsten was produced by Austria, Bolivia, Brazil, Canada, Peru, Portugal, Russia, Rwanda and Thailand.
9.Tungsten, though a heavy element, does play a role in biological function. Tungsten is used by several forms of bacteria, such as oxidoreductases, which create aldehydes by reducing carboxylic acids; however, these enzymes also have the ability to catalyse oxidations.
10.Tungsten is primarily used to produce hard materials for various industries; tungsten carbide being the most common. However, this element is also used to create steels and alloys, such as high speed steel. In addition, about 10% of all tungsten produced will be used to form chemical Compounds

About the Author

PublicMining.org is a free resource about the mining industry for the discriminating http://publicmining.org"> mining investor

ไม่มีความคิดเห็น:

แสดงความคิดเห็น