Process for preparing multicomponent composite rare-earth-tungsten electrode material

Abstract

The present invention belongs to the field of refractory RE functional material. The improved multicomponent composite RE-W electrode material contains three kinds of RE oxides in 2.0-2.2 wt%, including La2O3, Y2O3 and CeO2 in 0.4-1.4 wt% each, except W. The preparation process of the multicomponent composite RE-W electrode material includes compounding mixed RE oxide solution with La2O3, Y2O3 and CeO2; preparing suspension of ammonium paratungstate in deionized water; mixing the solution and the suspension via stirring, evaporation and drying; the first hydrogen reduction at 550-700 deg.c, and the second hydrogen reduction at 850-1000 deg.c to prepare powder of average granularity of 1.2-1.4 micron. The preparation process has no ammonium paratungstate calcinating step, simplified process, low power consumption, raised finished product rate and stability.

Description

Technical field: [0001] The invention discloses a preparation method of a multi-element composite rare earth-tungsten electrode material, which belongs to the field of rare earth refractory metal functional materials. Background technique: [0002] Tungsten electrode is the key material in inert gas shielded welding and plasma welding, cutting, spraying, melting and special electric light source. At present, thoriated tungsten electrode (including ThO 2 ) and cerium tungsten electrodes (containing CeO 2 ). Thoriated tungsten electrodes will bring radioactive hazards to the environment and human health during their production and use; cerium tungsten electrodes can only replace thoriated tungsten electrodes in small-scale welding tungsten electrodes. [0003] Since the 1970s, countries around the world have successively developed a variety of unit and composite tungsten electrode materials to replace thoriated tungsten. The newly developed rare earth-tungsten electrodes are...

AI Technical Summary

Problems solved by technology

The above-mentioned rare earth-tungsten electrode materials have their own advantages and disadvantages: the lanthanum tungsten electrode has good arc stability and electrode burning resistance performance when working at medium and small currents, but its processing performance is poor, and the burning loss is serious when it is used at high current; Yttrium-tungsten electrode has high arc pressure when used, and the electrode has good anti-burning performance when working with high current, but its processing is difficult, and the arc stability is poor when used at low current; although the comprehensive welding performance of multi-element composite rare earth-tungsten electrode can be compared with that of thoriated tungsten Electrodes are comparable and can adapt to various working conditions to replace thoriated tungsten electrodes. However, its processing performance is poor, and the yield rate in industrial production is low, which increases production costs.

Therefore, the high production cost makes it difficult to replace thoriated tungsten electrodes on a large scale

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