The performance of tungsten filament will indeed decrease in long-term use. This is mainly due to the combined effect of many factors. The following is a detailed analysis of this phenomenon:
- Performance degradation caused by physical changes
Sublimation effect:
Tungsten filament will sublimate at high temperatures, changing directly from solid to gas, causing the tungsten filament to gradually become thinner.
The thinning of tungsten filament increases its resistance and increases the heat generation, which may cause overheating and breakage.
Thermal expansion and contraction:
Tungsten wire will expand and contract when the temperature changes. Long-term thermal expansion and contraction will cause slight damage to the tungsten wire.
- Performance degradation caused by chemical changes
Oxidation:
Tungsten wire will be oxidized when used in a high-temperature oxidizing atmosphere for a long time, resulting in a decrease in conductivity.
Oxidation will also form an oxide film on the surface of the tungsten wire, further affecting the performance of the tungsten wire.
Electron migration:
Under the action of the electric field, the tungsten wire will undergo electron migration, which will cause lattice distortion and damage after a long time.
- Performance degradation caused by mechanical stress
Long-term mechanical stress:
Long-term mechanical stress will cause the material of the tungsten wire to deform or fatigue, resulting in performance degradation.
Especially when wound into a filament, the tungsten wire may twist, deform and sag at the beginning of the ignition point due to the internal stress of uneven deformation.
- Other factors
Process quality:
If the production process of tungsten wire is not well managed, it may cause micro cracks on the surface of the tungsten wire or local brittleness, which is easy to break during long-term use.
Usage environment:
Frequent switching of the bulb, high working temperature or unstable voltage may shorten the service life of the tungsten filament.
More details of tungsten wires, please visit website: http://tungsten.com.cn/tungsten-wires.html
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