Here is a brief tungsten filament introduction.
Tungsten filament is made from tungsten rod by forging. Tungsten rod can be drawn into tungsten filament by heating.
Tungsten filament is mainly used in incandescent lamps, halogen lamps and other electric light sources.
In the smelting process of tungsten filaments that used as various luminous bodies in lamp bulbs, tungsten filament manufacturers need add small amounts of potassium, silicon and aluminum oxide. This kind of tungsten filament is call called doped tungsten filament and also known as non-sag tungsten filament. Nowadays, tungsten filament is generally made by all kinds of wire drawing dies.
The main application of tungsten filament is to make filaments and high-speed cutting alloy steel. Tungsten filament is also used in optical instruments, chemical apparatuses, etc..
Tungsten has high melting point, high resistivity, good strength, low vapour pressure, so tungsten is the best material to make incandescent filament among all pure metals. However, tungsten is featured by high hardness and brittle, so tungsten filament is not easy to be processed.
In 1909, Coolidge invented the processing technic of tungsten filament, which plays a decisive role for the production and promotion of the incandescent light bulbs and is still used today.
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