Relationship between quality loss of arc erosion and arcing times of new tungsten copper contacts material

New tungsten copper contacts material: tungsten copper contacts (with fibrous structure)
Sample 1: WCu30 prepared by mixing, sintering and other process;
Sample 2: fiber structure of tungsten copper contacts (Φ = 0.12mm);
Sample size: 10mm * 10mm * 10mm.

The arc erosion of new tungsten copper contacts material and WCu30 are increasing with the increase of arcing erosion. In the beginning, quality loss of arc erosion of both samples increase rapidly with the number of arcing time, then slowly increasing during 15-20 times, and then quickly increase after 30 times, besides, the quality loss of sample 2 is less than sample 1. The reason of quality loss increased rapidly of the two samples is: under the thermal action of discharge arc, the original burr, unevenness and impurities of the cathode material’s surface are suffering from strongly electron and ion sputtering, resulting in a large loss of material; since sample 2 is using tungsten fibers as its materials, which enhance its mechanical properties, so the strength and hardness of the material increases, and the loss can be reduced; the arc has played a role in it at the same time, the molten copper, due to capillary suction, can make melt filling in tungsten skeleton, such splash and losses of cathode materials can be reduced. Because the quality loss of Sample 2 is less than sample 1, so sample 1 with higher arc resistance to corrosion.

 

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