Tungsten Heavy Alloy

Tungsten is a rare metal, is also an important strategic material, and in ancient times was known as the "tungsten heavy alloy". 1783 Spanish named Deep Air Asia. The tungsten content in the earth's crust is 0.001%. There are about 20 minerals containing tungsten found until now. Tungsten deposits in general along with the activity and the formation of granitic magma. After smelting tungsten is silver-white lustrous and hard metal with high melting point.

Tungsten, also known as Wolfram, lapis ponderosas or heavy stone, has highest melting point of all elements except carbon - sources in scientific literature vary between 3387°C and 3422°C. Tungsten heavy alloy also has also excellent high temperature mechanical properties and the lowest expansion coefficient of all metals. A temperature of about 5700°C is needed to bring tungsten to boil which corresponds approximately to the temperature of the sun's surface. With a density of 19.25 g/cm3, tungsten is also among the heaviest metals. Its electrical conductivity at 0°C is about 28% of that of silver which itself has the highest conductivity of all metals.

The metal is known as tungsten in some countries and as wolfram in others, including Sweden, the country of origin of the name tungsten. The chemical symbol W, which is universally used to denote tungsten, suggests that wolfram was formerly the more generally accepted name for the element. In Britain, the mineral wolframite is also known as wolfram.

Since 1912, Tungsten heavy alloy (the element or, perhaps, an uncle) has been widely used to make the most essential part of any light bulb–the filament. Bumpers have tungsten heavy alloy with tungsten content of 3000 to 6000 one hundred watt light bulbs, depending on model and configuration.

During World War II, tungsten played a significant role in background political dealings. Portugal, as the main European source of the element, was put under pressure from both sides, because of its deposits of wolframite ore at Panasqueira. Tungsten's resistance to high temperatures and its strengthening of alloys made it an important raw material for the arms industry.


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