Tungsten filament product. Mainly used for electric light filament and support, and also widely used in vacuum evaporation, electronics, aerospace industries. Tungsten in metallurgical manufacturing process will be mixed with a small amount of potassium, silicon and aluminum oxides, such as tungsten doped tungsten wire (Doped Tungsten Wire), also known as tungsten or aluminum anti-sag tungsten wire tungsten ( Non-sag Tungsten Wire). The main purpose of doping technology is affecting the internal grain structure of tungsten, tungsten out to ensure post-processing high temperature creep rate, so that 80% of doping and reduction processes determine the quality of tungsten.
Tungsten coated graphite drawing by lubricant, heated to red hot, and then tungsten carbide or diamond wire drawing die, according to a range of compression processing. This process is sometimes referred to as hot cold, although the tungsten heating, but still below the recrystallization temperature range. Thus, as the cross-sectional area reduction, increased strength and toughness. Processing to finished size of tungsten may be removed subsequently graphite, straightening, or annealing.
According to specifications can be divided into thick tungsten tungsten wire (diameter 0.6mm-1.3mm), the tungsten wire (diameter 0.2mm-0.6mm), fine tungsten wire (1MG-120MG, MG = mg/200mm), ultra-fine tungsten wire (1MG following specifications); under state can be divided into black silk (surface protection layer of graphite), white silk (by electrolytic polishing), straightening tungsten wire (through the straightening treatment).
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