The Advantages of Graphite as An Electrode
Graphite is widely used in the electrical industry as electrode, brush, carbon rod, carbon tube, mercury rectifier anode, graphite gasket, mobile phone parts, electronic screen coating and so on. Among them, flake graphite electrode is the most widely used. When smelting various alloy steel and ferroalloy, the graphite electrode is used. A strong current is passed through the electrode into the melting area of the electric furnace to generate an arc, which converts electrical energy into heat energy and raises the temperature to the expected value, so as to achieve the purpose of smelting or reaction. In addition, in the electrolysis of magnesium, aluminum, sodium, the anode of the electrolytic cell also used graphite electrode. Graphite electrode is also used as the conductive material of furnace head in the resistance furnace for producing fresh sand.
What are the advantages of graphite as an electrode?
1. Good conductivity of graphite
The conductivity of graphite is one hundred times higher than that of ordinary nonmetallic minerals. Thermal conductivity of steel, iron, lead and other metal materials. The thermal conductivity decreases with the increase of temperature. Even at extremely high temperature, graphite becomes an insulating body.
2. Graphite has good thermal stability
The softening point of copper is about 1000 ° c, and it is easy to be deformed by heat. The melting point of graphite is 3850±50 ° c, and the boiling point is 4250 ° c. The strength of graphite increases with the increase of temperature. At 2000℃, the strength of graphite is doubled. In comparison, the thermal expansion coefficient of graphite is only 1/30 of that of copper.
3. graphite plasticity, easy to carry out precision machining
Graphite material has the advantages of high processing accuracy and good surface effect, especially in the precision, complex, thin wall, high hard material mold cavity processing has a greater advantage. Because the cutting resistance of graphite is only 1/5 of that of copper, it is easier to grind and polish by hand. Graphite processing without burr, easier to achieve automatic production. Can achieve complex geometric modeling.
4.Good chemical stability
Graphite has good chemical stability at room temperature, resistant to acid, alkali and organic solvent corrosion.
5. Good thermal shock resistance
Graphite in the use of normal temperature can withstand the dramatic change in temperature without damage, temperature sudden change, graphite volume change is not big, will not produce cracks.
6. graphite light weight
Graphite is light and has only a fifth the density of copper.