Tungsten wire is the raw material for the manufacture of electric light source materials, high temperature heating elements and high temperature resistant components. The traditional production method of tungsten wire is generally to add silicon, aluminum, potassium and other elements to tungsten oxide to obtain doped tungsten oxide (wherein K and Si are added in the form of K2SiO3 solution, and Al is added in the form of Al (NO3) 3 solution). Then doped tungsten oxide is reduced twice or once by hydrogen at a temperature of 500-950℃, and after hydrochloric acid and hydrofluoric acid pickling (or no pickling), doped tungsten powder is obtained, and the doped tungsten powder is pressed by steel mold or static pressing and then sintered by vertical melting to obtain doped tungsten strip. Doped tungsten wire is made by rotary forging and wire drawing. In the existing literature, it is introduced that rhenium can be added to tungsten to make tungsten wire have better seismic performance, and rhenium is generally added to tungsten oxide or tungsten powder in the form of ammonium rhenate.
Through the production of K content in 80-100ppm, rhenium content in 0.4-0.8% tungsten-rhenium composite powder, and then processed into a alloy wire, this material has a higher recrystallization temperature and can be better used in tungsten halide lamps. Combining the results of the two patents, we found that for the rhenium content in 0.4-0.8% of this trace doping, the doping method of patent 1 has a large fluctuation range of rhenium content, and the cold resistance of tungsten wire changes greatly, which is not conducive to the design and production of the filament. Patent 2 is the production of tungsten-rhenium composite powder, and then processed into a method of alloy wire, the specific doping method is not mentioned, but the rhenium content fluctuates in the range of 0.4-0.8%, the cold resistance as an important parameter of filament design changes, is not conducive to filament design. Moreover, tungsten rhenium strips with K content of 80-100ppm have low density and are difficult to process.
Tungsten-rhenium alloy, calculated by weight percentage, the potassium content of the alloy is 65ppm-75ppm, and the rhenium content is 0.45%-0.55%. The increase of rhenium content will increase the recrystallization temperature of tungsten-rhenium alloy (as shown in Table 1), but it will also cause the melting point of the alloy to decrease, resulting in the deterioration of high temperature performance. The high temperature performance of tungsten-rhenium alloy wire can be improved by increasing the content of K, but the processing performance will be reduced. By reasonably controlling the ratio of potassium content and rhenium content of tungsten-rhenium alloy, the invention can well ensure that the alloy has high recrystallization temperature and high temperature performance, and at the same time has good processing performance.
