Ceriated Tungsten Electrode Manufacturing

Manufacturing ceriated tungsten electrode usually uses powder metallurgy method. And the production processes are as follow, mixing-ball-milling-reduction-pressing-sintering-swaging-drawing-straightening-cutting-grinding. In order to improve ceriated electrode properties, the production process should be strictly control and some production parameters should be adjusted. There we will introduce how to manufacturing ceriated electrode, which is little different form original manufacturing processes.

First, the doped quantity is different, the cerium oxide from 1.0% up to 4.5% by weight by powder metallurgy, besides, characterized in that a cerium salt solution is added to tungsten trioxide. After pressing the product obtained is then dried and calcinated at 300 to 800°C, reduction with two-steps hydrogenous reduction method in a hydrogen tubular furnace, whereby the first step is carried out at 750°C and the second step at 900°C. Using two-steps hydrogenous reduction method can obtain the maximum grain size of the tungsten powder which is less than 8µm. Then the obtained tungsten cerium powder is pressed into bar form by isostatic pressing machine. Pressing by isostatic pressing machine can make product more densification and can improve electrodes strength. After pressing presintered the bar in molybdenum furnace with hydrogen passing through it, again the bar is sintered at high temperature electrically and under hydrogen protection. When we got the blank bar is not finish yet, we should operate a series subsequent process to make tungsten bar become thinner and shorter which is convenient for customers using. On the other hand, after subsequent deformation process, electrode’ mechanical properties will better. So the bar is hot rotary forged, and annealed, when necessary, during rotary forging, furtheron drawn under Ø3.00 mm diameter to wire of necessary diameter under the gas heated furnace, and annealed, when necessary, during the drawing.

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