Process Optimization of Multi Rare Earth Tungsten Electrode

Tungsten electrodes are the key materials in inert gas shielded welding and plasma welding, cutting, spraying, melting and special electric light sources. At present, most of them are tantalum tungsten electrodes (including ThO₂) and tantalum tungsten electrodes (including CeO₂). The thorium-tungsten electrode will bring radiological hazard to the environment and human health during its production and use; the thorium-tungsten electrode can replace the thorium-tungsten electrode only in the small-size welding tungsten electrode.

With the passage of time, countries around the world have successively developed a variety of unit and composite tungsten electrode materials to replace tantalum tungsten. The newly developed rare earth-tungsten electrode has a tantalum tungsten electrode, a tantalum tungsten electrode, a tantalum tungsten electrode and a multi-component composite rare earth. The tungsten electrode is dominant. Among them, the welding performance of the multi-element rare earth tungsten electrode is closest to that of the tantalum tungsten electrode, and even so, the processing property is poor, the yield is low in industrial production, and the production cost is increased. Therefore, the high production cost makes it difficult to replace the tungsten-tungsten electrode in a wide range.

In order to solve the yield and production problems of multi-rare earth tungsten electrodes, save man-hours and reduce costs, researchers have improved the process flow through process optimization, and finally hope to produce multi-rare earth tungsten electrodes with low cost and good performance. The optimization process includes the following contents. :

Take 1Kg of APT powder, add 1000ml of deionized water, stir evenly, put it into the doping pot, add 0.44% La₂O₃, 1.32% Y2O₃, 0.44% CeO₂ according to the weight percentage of the final product, weigh it into cerium nitrate, cerium nitrate and cerium nitrate. The mixed solution is thoroughly stirred and evaporated to dryness to obtain a mixed powder, and the mixed powder is subjected to primary reduction (temperature: 550 °C) and secondary reduction (temperature: 850 °C) in a reduction furnace to obtain a rare earth oxide and A mixed powder of tungsten powder having an average fineness of 1.2 um. The reduced powder is added to glycerin and alcohol in a certain proportion for 1 hour, then pressed, calcined, and sintered and sintered, and then subjected to rotary forging, chain drawing, straightening, cutting and polishing to form tungsten electrodes of various specifications. .

The multi-component composite rare earth-tungsten electrode prepared by the optimized method not only has better processing performance, high yield, but also excellent welding performance, and the comprehensive performance exceeds the tantalum tungsten and tantalum tungsten electrodes.

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