Tungsten Filament Properties

Tungsten Filament Picture

Since tungsten filament is made of tungsten, so it owns tungsten filament properties of tungsten—high melting point, high corrosion resistance, high temperature resistance, lowest thermal expansion and inactive to react with other gases. These properties lead tungsten filament to have a better performance in bulbs.

If a metal has a low melting point would mean the bulb couldn't be operated at high temperatures, and the light would be yellowish or reddish. Thus the bulb will become unserviceable and be abandoned quickly, that is to say, this bulb does not have a long life. However, a high thermal expansion coefficient would mean that the length of the filament would change a lot when it was heated; this would cause mechanical problems as the filament expanded and contracted with use.

Tungsten is a metal that is grayish-white in appearance. It is solid at room temperature and tungsten has the highest melting point of any metal (6170 degrees Fahrenheit). This metal has a high tensile strength and is very resistant to corrosion. So that tungsten filament can be used longer and still bright enough.