English
Multiple-component composite tungsten electrode is a new generation of green environmental protection products used to replace radioactive tungsten helium tungsten electrodes. The critical arc starting voltage of the electrode is 3.9V lower than that of the thorium tungsten electrode, and the burning loss is 1.25mg lower than that of the thorium tungsten electrode. The comprehensive welding performance is superior to that of the lanthanum tungsten.
Rare earth in the presence of tungsten electrode
Before discussing the role of rare earth elements in the electrode, we must first determine the existence of rare earth elements in the tungsten electrode. To do this, we perform XRD phase analysis of the sintered compacts of the multiple composite rare earth tungsten electrodes, as shown in the figure below. Photo of rare earth elements in multiple composite tungsten electrodes
From the above figure, it can be seen that in the tungsten electrode, rare earth elements mostly exist in the form of rare earth tungstates or tungstates, and different rare earth tungstates or tungstates have different properties. La2O3, CeO2, Y2O3 react with tungsten at high temperature to form rare earth tungstates or tungstates. These salts have different physicochemical properties. The rate of diffusion to the surface and the rate of evaporation on the surface are different during the operation of the electrode. The rational combination of these salts can provide a multi-element composite rare earth tungsten electrode with the best welding performance.
