The Preparation Process of Cerium Tungsten Alloy Wire

Cerium tungsten alloy wire is a kind of electrode material has broad application prospects, compared with the traditional thorium tungsten wire, tungsten cerium has electronic work function, low high emissivity, high luminous efficiency, low voltage and other advantages, the most important thing is also no radioactive pollution in the electronic emission tube, argon arc welding and other aspects of the future to replace thoriated tungsten alloy wire is represent the general trend.

Some scholars have proposed a preparation method of cerium tungsten wire, and the brief steps are as follows:

1.Select the size in 30 um ~ 50 um square monoclinic ammonium paratungstate, after mild reduction of generation of blue tungsten oxide, doped Al (NO₃)₃ solution, K₂SiO₃ solution, Co (NO₃)₂ solution, the elements of aluminum, cobalt can promote the potassium into the tungsten matrix, thereby significantly reducing the tungsten wire low temperature brittleness, reduce the splitting of tungsten, the tungsten system has good high-temperature sag resistance;

2.After mixing the part of a direct reduction, another part of the two stage reduction stage reduction temperature 550 ℃ to 660 ℃, two stage reduction temperature 610 to 810℃, with a ratio of 4:6 to k elements and collocation, uniform dispersion in the cobalt tungsten powder body, can improve the high temperature seismic tungsten wire performance. After two reduction of the raw material after 30-40 hours of pickling, at 80 ℃ to 120 ℃ temperature vacuum drying, after adding cerium nitrate solution after pickling material, cerium resistance to high temperature, high emissivity, luminous efficiency and low arc voltage, no radioactive pollution, good performance.

3.After sifting and sifting, the first reduction is carried out at 750 -800 ℃, and is carried out for second reduction at 900 ℃ - 950 ℃. The sifting mixture is pressed by equal static pressure and pressed by mechanical steel mould, and then pressed into strips to make low temperature pre sintering. Calcining temperature control at 1100 ℃ to 1250 ℃, sintering or two high temperature sintering in induction furnace, ensure the crystallization properties of tungsten bars but also can reduce the production cost, improve the rod density, the grain size uniformity, good high-temperature performance of tungsten wire;

4.The method of multi machine cogging and rotary calcining is adopted to improve production efficiency, save energy and ensure better uniformity of products. Crystallization annealing, recrystallization annealing and stress annealing are eliminated. Alternately with rotary forging, it can be processed to 3.8mm. The stress on the surface of tungsten wire can be eliminated in time and the crack of tungsten wire can be reduced by repeated annealing. The processing stress is eliminated, the blockage of the dislocation is reduced, the plastic deformation ability of the metal is recovered, the high temperature sag resistance of tungsten wire is improved, and the tungsten wire is finely drawn to make finished tungsten wire.

By adding elements such as cerium, potassium and cobalt, the elements in the tungsten alloy billets can be evenly distributed, the wire winding performance is good, and the seismic performance of tungsten wire is increased. The finished product has high yield and long service life. It can be used in the fields of space, aviation, photoelectron, information technology engineering, lighting and so on, which can be widely used in the field of space, aeronautics, photoelectron, information technology, lighting and so on.

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