Why is graphite used for electrodes?

Electrodes can be made from any conductive material. Depending on the nature of the application, electrodes are typically from graphite. Noble metals like gold, silver or platinum can be used but are very expensive. Copper, titanium and brass are other options, but they are also costly.

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Graphite is used as an electrode material because it is a good conductor of electricity, is chemically stable, and can withstand high temperatures. It also has a low reactivity and thermal expansion coefficient, making it suitable for electrode use in electrochemical cells.

Graphite is a Good Conductor of Electricity

Graphite&#;s unique structure, with layers of carbon atoms arranged in hexagonal, allows the electrons to move freely, making it a good conductor of electricity and useful as an electrode material.

In graphite, the carbon atoms are arranged in layers, retaining their structure through covalent bonds. A significant feature of graphite&#;s structure is the number of delocalized electrons present. Graphite requires only three of its outer energy electrons to bond, leaving the fourth free to act in a delocalized manner. Delocalized electrons are not readily associated with a particular atom and move freely. These electrons enable graphite to exhibit a high level of conductivity, explaining why the material is frequently used for electrodes.

Graphite Electrode Materials

Check out MWI&#;s EDM Graphite Product Guide that contains information for our Electro-Carb &#;EC&#; family of graphite electrode materials. Graphite grades include EC-4, EC-12, EC-14, EC-15, EC-15C. EC-16, EC-17, HK-6, and HK-6C.

1. Damp graphite electrodes should be dried before use.

2. Remove the foam plastic protective cap on the spare graphite electrode hole, and check whether the internal thread of the electrode hole is complete.

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3. Use oil and water-free compressed air to clean the surface of the spare graphite electrode and the internal thread of the hole; avoid cleaning with steel wire or metal brush and emery cloth.

4. Carefully screw the connector into the electrode hole at one end of the spare graphite electrode (it is not recommended to directly install the connector into the electrode removed from the furnace), and do not hit the thread.

5. Screw the electrode sling (graphite sling is recommended) into the electrode hole at the other end of the spare electrode.

6. When lifting the electrode, put a soft object under one end of the spare electrode mounting connector to prevent the ground from damaging the connector; use a hook to extend into the hoisting ring of the spreader and then lift it. Lift the electrode smoothly to prevent the electrode from loosening from the B end. Take off or collide with other fixtures.

7. Hang the spare electrode above the electrode to be connected, align it with the electrode hole, and then slowly drop it; rotate the spare electrode to make the spiral hook and the electrode lower together; when the two electrode ends are 10-20mm apart, use compressed air again Clean the two end faces of the electrode and the exposed part of the connector; when the electrode is completely lowered at the end, it should not be too strong, otherwise the electrode hole and the thread of the connector will be damaged due to a violent collision&#;

8. Twist the spare electrode with a torque wrench until the end faces of the two electrodes are in close contact (the correct connection gap between the electrode and the connector is less than 0.05mm).

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