Ceriated Tungsten Electrode Manufacturing

Ceriated tungsten electrode has many different manufacturing methods. Manufacturers usually use yellow tungsten oxide to mix with cerium and after second reduction can obtain mixed powder. The mixed powder processes pressing, sintering and subsequent processing to obtain electrode. Some manufacturers will mix pure tungsten powder with cerium compound to obtain cerium tungsten powder.

Using solid-liquid doping method to mix blue tungsten oxide with ceria oxide, after reduction, pickling, isostatic pressing, sintering, and rolling cogging and other subsequent processing obtain electrode. Using this method to produce electrodes not only the cerium content distribution in electrode is evenly, but also the electrode has good arcing effect and small burning rate. The production processes are as follows:

1. Blue tungsten oxide (fee's size is boat 8 ~ 12um) mixes with cerium nitrate hexahydrate solution.
2. Adjust the pH of the suspension, so that the deposits of metal hydroxides will deposit on the porous blue tungsten oxide particles.
3. To dry the mixed powder, and then places in 600 ~ 1000 ℃ continuous hydrogen reduction furnace to restore. Blue tungsten oxide and metal hydrides were restored to tungsten and metal oxides.
4. The cerium tungsten powder after acid-washed and sieved uses isostatic pressing machine to press.
5. The compacted blank is placed at 1200 ℃ ± 50 ℃ hydrogen furnace for30 min pre-sintered, in order to improve the strength of the electrode.
6. After pre-sintered, the blank will process three-steps heating and preservation. The first step of heating and preservation can removal the impurities of billet. In the second step should increase the temperature, but below cerium’s melting point, for minutes preservation, which can make cerium oxide to maintain dispersion state. The third step should increase the temperature to 2600 ℃, complete sintering.
7. After sintering, the blank should process rotary swaging and drawing. In the process of process, the blank should be annealed. And then after straightening, polishing, cutting and other processes obtains ceriated tungsten electrode.

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