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What to know about Tungsten Filaments

Tungsten -The right Filament

There is no second opinion that choosing the right filament was a huge task. The filament is the light-producing component of the device. When an electric current travels through it, it illuminates. The heat produced by the filament’s high resistance to the flow of electric current, causes it to glow.

By integrating both the technological and commercial requirements, there had to be an element that would fit in better. But there was a problem-Carbon filament was short-lived and caused discoloring tubes.

Whereas, Platinum is not cost-effective because of its high price, therefore, commercial production was not practical. Despite the fact that it meets one of the major requirements for the production of light which is heat endurance, and it worked fantastically. Yet, the market price would never be favorable.

This might excite you that Edison knew tungsten would work well as a filament for incandescent light, but he could not refine the metal. Another scientist, William David Coolidge, work on tungsten to make it the best filament for incandescent light. Tungsten, in any case, worked its best.

Why Tungsten??

  • Higher Melting Point (about 3422 degree-Celsius)
  • Higher Boiling Point (around 5555 degree-Celsius)
  • Density around 19.25 g/cubic-cm
  • Less expensive than Platinum


Properties of Tungsten Filaments

  • The exciting properties of tungsten made it a worthy target.
  • Filamentary Tungsten Dispenser stands out among all the elements in the periodic table because of having the highest melting point which is 3422 degrees. When electricity passes through it, it glows white-hot without melting. It produces vibrant colors, rather than the yellowish hue of earlier bulbs.
  • Tungsten is a heavy, fragile metal. Metalworkers and manufacturers mix it into steel and other alloys to make it harder and functional, as because of its brittle nature, it cannot be used alone
  • Except for mixtures of concentrated nitric and hydrofluoric acids, tungsten is relatively resistant to acid attack. However, it can be highly reactive to alkaline oxidizing melts, such as fused mixtures of potassium nitrate and sodium hydroxide or sodium peroxide.
  • At room temperature it is unreactive (inert) to oxygen, however, when heated, it combines rapidly to form trioxides. Similarly, when tungsten is contacted with fluorine at room temperature, produces Hexafluoride.
  • At room temperature, tungsten is normally brittle. However, pure tungsten can be molded and shaped into a fine wire by putting it under high temperature and mechanical processing.
  • The first commercial use of tungsten was as a lamp filament. But since then it has found its way into a wide range of electrical and electronic applications. Tungsten is used to make tungsten steels, and some of it has been used in the aerospace industry to make nozzle throats and leading edges for rocket engines. Tungsten carbide is used to make extremely hard and tough dies, tools, gauges, and parts.


Some Common Uses,


  • Tungsten carbide is one of the most popular and toughest tungsten compounds. Tungsten is used to harden saw blades and create drill bits due to its strength when formed into compounds. According to the BBC, cutting one drill bit from tungsten with a diamond cutting device will take up to ten minutes. Another interesting use of tungsten carbide that it is often used by jewelers to create wedding bands and other rings.
  • Other applications for tungsten include metal evaporation, paint processing, glass-to-metal seals. It is also used in the production of electron and television tubes.
  • Tungsten is used in the production of bullets and rockets for “kinetic bombing.” In this type of attack, a highly dense substance is used Instead of a regular explosive to crack the protection shield.


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