The preparation process of anti-droop tungsten wire is as follows:

Ammonia metatungstate powder Partial high temperature reduction Add K2Si and AlCl3 and mix  Powder mixture 500~900oC high temperature reduction  Powder 2700~3000oC high temperature sintering  1600oC to 1200oC cooling multiple hot rolling (intermediate annealing temperature is 2000~2300oC) 1000oC to room temperature cooling wire drawing, and stress relief annealing in the middle.

After winding, the potassium-doped fine tungsten wire is heat treated at 1700oC to remove stress, and then the core rod of the wire is removed by selective pickling, and finally recrystallized at 2200oC to obtain the anti-droop grain structure.

The coarse potassium bubbles in the sintered powder gradually become long strips after multiple rolling and wire drawing deformation, and the aspect ratio can reach 20 or more. During the annealing process, the long potassium bubbles are broken and segmented into small potassium bubbles.

Tungsten wire is also made by powder metallurgy. By mixing tungsten powder, the tungsten powder is loaded into a mold and pressed into a rod in isostatic pressing. The rod blank needs to pay attention to uniformity, and then it is placed in a high-temperature furnace for sintering, and the density is improved, but the internal structure is not dense enough at this time. Then, it is forged to reduce the diameter, and the density is further improved. At the same time, the ductility and strength are also improved, which provides a basis for subsequent drawing. Through wire dies of various diameters, the diameter is further reduced until the appropriate diameter is reached. In this process, the tensile strength of the tungsten wire is also increased.

Guarantee 99.95% purity, and produce tungsten wire strictly according to fine tolerances to ensure the consistency of mechanical properties and layering level of tungsten wire. At the same time, eddy current detection and other detection methods are used to measure the quality to ensure that the drawn tungsten wire has uniform wire diameter, no internal cracks, splits, continuous pits and scratches, etc.

In addition to pure tungsten wire, rare earth elements or potassium elements are added to improve the anti-sagging performance of the material.

It can fully meet customers' requirements for creep resistance, durability, thermal conductivity, reliability, and low pollution.