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Why Can Graphite Replace Copper As An Electrode? (1)

Pulished on Mar. 12, 2019

Why can graphite replace copper as an electrode? (1)

In the 1960s, copper was widely used as an electrode material, with a usage rate of about 90% and graphite of only about 10%. In the 21st century, more and more users began to choose graphite as an electrode material, in Europe, more than 90%. The above electrode material is graphite. Copper, the once dominant electrode material, has almost lost its advantages compared to graphite electrodes(such as UHP Graphite Electrodes). What caused this dramatic change? Of course, there are many advantages of graphite electrodes.

(1) Faster processing speed: Under normal circumstances, the machining speed of graphite can be 2~5 times faster than that of copper; and the electrical discharge machining speed is 2~3 times faster than copper. The material is not easily deformed: in the processing of thin rib electrode The advantage is obvious; the softening point of copper is about 1000 degrees, which is easy to be deformed by heat; the sublimation temperature of graphite is 3650 degrees; the thermal expansion coefficient is only 1/30 of that of copper.

(2) Lighter weight: The density of graphite is only 1/5 of that of copper. When large electrodes are subjected to electrical discharge machining, the burden on the machine tool (EDM) can be effectively reduced; it is more suitable for application on large molds.

(3) The discharge consumption is smaller: since the spark oil also contains C atoms, during the electric discharge machining, the high temperature causes the C atoms in the spark oil to be decomposed, and a protective film is formed on the surface of the graphite electrode to compensate the loss of graphite electrode.

HEBEI MOCHANG CARBON CO., LTD(MCC) is a professional supplier & manufacturer of graphite products in Hebei China, including Graphite Electrode, graphite block, graphite crucible, graphite powder

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