Multiple Composite Rare Earth Tungsten Electrodes Production Technology

Multiple composite rare earth tungsten electrodes have good weldability, and non-radioactive, so it is the best alternative for thorium tungsten electrode. However, this electrode has low finished products rate and high production cost, thus greatly limiting its application range. Doping rare earth can help to reduce the work function of the electrode, improving the welding performance. However, the rare earth element will impede tungsten grain growth. And during processing, the rare earth will increase the recovery and recrystallization temperature of tungsten electrode, so that the deformation resistance of electrode is increased, making the sintering process not easy to control the, and finished products having low rate.

To improve multiple composite rare earth tungsten electrodes production technology will help improve the finished products rate and reduce production cost. To produce multiple composite rare earth tungsten electrodes using APT and rare earth nitrate as raw materials, doped with La, Y and Ce and other rare earth elements, can achieve uniform doping. Using two-stage reduction can produce good performance rare earth tungsten metal powder. During the restore process, you can use a large temperature gradient reduction method to control particle size. At sintering process, before the sintering neck grows up to closure making rare earth uniformly distributed in the tungsten bar, which can be obtained good performance sintered billet. In the process, appropriate increase processing temperature in the initial stage of the process, using multi-pass deformation processing technology, making the tungsten bar uniform deformation and improve processing rate and yield.

By strictly controlling multiple composite rare earth tungsten electrode manufacturing process technology can not only improve productivity, but also can obtain excellent performance tungsten electrode. In addition, it is also beneficial to composite rare earth tungsten electrode industrial production realization to reduce production costs and expand its application range.

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