Application of Non-sag Tungsten Wire

Non-sag tungsten wire is also known as doped tungsten wire, which is added potassium, or other elements to improve its anti-high temperature creep performance. It is widely used in the hot wire of tubes, incandescent lamps, car headlights, fluorescent lamps, motorcycle filament lamps and other lamps.

The internal structure of tungsten wire will suffer damage and occur recrystallization when the temperature reaches 1100-1300 ℃,. If the temperature is raised to 1500-1600 ℃, the tungsten wire will sag and become brittle. In addition, there are many other factors influence its sagging, such as burn hydrogen time and tungsten uneven heating time, but the tungsten filament operating temperature is generally higher than this in an actual application. For example, tungsten filament incandescent lamp operating temperature is generally in 2000-2800 ℃, therefore, it is generally added a very small amount (content can not be too low, according to different uses and performance requirements of the tungsten wire to control amount) of potassium oxide, silicon and other additives during sintering of tungsten to improve its non-sag performance.

 

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