Relationship between mass loss of arc erosion and arcing times of fibrous structure tungsten copper points

Sample 1: WCu30, prepared by powder metallurgy, size of 10mm * 10mm * 10mm;
Sample 2: Fibrous structure tungsten copper points, Φ = 0.12mm, size of 10mm * 10mm * 10mm;

The arc erosion of WCu30 and fibrous structure tungsten copper points, which increase with the arcing erosion increase. Along with the increase of arcing time, mass loss of both points’ arc erosion increase rapidly at first; then during 15-20 times, it increases slowly; and then after 30 times, it increases quickly. What is more, sample 2’s mass loss is less than sample 1’s. The reason why mass loss of the two samples increasing rapidly lies that: original burr, unevenness and impurities on the surface of cathode material are subject to strong electron and ion sputtering under thermal action of discharge arc, leading to a large loss of material; Because sample 2’s raw material is tungsten fiber(can enhance mechanical properties), therefore, its hardness and strength of the sample will increase, and whose loss can be reduced; At the same time, due to capillary suction, the molten copper can make melt filling in tungsten skeleton under the action of arc, so that splash and losses of cathode materials can also be reduced. Since the mass loss of Sample 2 is less than sample 1’s, so sample 2 owns lower arc corrosion resistance.



 

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