Non-sag tungsten Wire High Temperature Performance(2)

Non-sag tungsten wire working temperature is between 2300 ~ 2800 ℃, and the greater the average light bulb power, the higher the wire temperature.

According to a series of study and analysis conducted by Transmission Electron Microscopy (TEM) and Auger Spectrometer (AES) in 1970s, it shows that non-sag tungsten wire recrystallization structure, unique, with elongated strip whose coarse grains is overlapping each other, its formation is closely related to potassium content. Remaining trace potassium in doping tungsten bars form potassium bubble column which parallel to the axis of the filament during processing, and then hinder the process of lateral recrystallization grain growth, and thus generate long thick overlapping structure. Incandescent wire sagging is not only related to the additive element content and machining technology, but also the treatment process of wire production process. Tungsten retains a large number of internal stresses in finished products when we pulling it into wire, and will produce new internal stress of inhomogeneous deformation in the cross section of tungsten wire when we are winding the wire. The internal stress must eliminate thoroughly before tungsten wire is placing into the glass bulb, otherwise bulb will start twisting, distorting and sagging when it is lit. When the wire is sagging, it can severely reduce the luminous efficiency of the lamp.

 

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