Co-doped Effects on Tungsten Copper Electrode V

Since the large part of tungsten copper electrode is used for EDM (Electrical Discharge Machining), the measure of its electrical conductivity is crucial. However, the electrical conductivity is sensitive to the impurities and porosity so that the adding cobalt (Co) has an large effect on the electrical conductivity of tungsten copper electrode. The effect of different content of Co on the electrical conductivity of tungsten copper electrode diagram as follow:

The diagram shows that the adding Co element dramatically decreases the electrical conductivity of tungsten copper electrode. Before adding Co element, the electrical conductivity is about 34.5%IACS, while adds 0.2% Co element, the electrical conductivity greatly decreases 34.5%IACS to 16.4%IACS. With the constant increase of Co content, the electrical conductivity decrease constantly. However, tungsten dissolving in Co improves the sintering densification, a large number of solid phases connected with each other to form the continuous tungsten skeleton, the infiltration of liquid phase copper has been restricted, which leads to the maldistribution.

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