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Through the use of tungsten recrystallization temperature becomes very brittle, in case of a shock or vibration can easily break. In some of the requirements of high reliability electric light source products in order to prevent the filament breaks, often in the doped tungsten adding 3 to 5% of rhenium, tungsten-rhenium wire is called, it can make the extension of tungsten brittle transition temperature drops to room temperature or below. This is a very strange effect of rhenium, has not yet been able to find a substitute element rhenium, tungsten produce the same effect.
Tungsten at room temperature have good acid and alkali capacity, but in the humid air easily oxidized, so fine tungsten wire can not be stored for too long in a humid environment. Also tungsten at 1200 ℃ up and down start to react with the carbon generated tungsten carbide, so the filament to burn hydrogen treatment should pay attention to this issue, otherwise the graphite lubricant tungsten reacts with the surface, the filament would become brittle fracture.
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