Graphite has the following special properties due to its special structure:
1) High temperature resistant type: the melting point of graphite is 3850 ± 50 ℃, and the boiling point is 4250 ℃. Even if it is burned by ultra-high temperature arc, the weight loss is very small, and the coefficient of thermal expansion is also very small. The strength of graphite increases with the increase of temperature. At 2000 ℃, the strength of graphite doubles.
2) Conductivity and thermal conductivity: the conductivity of graphite is 100 times higher than that of general non-metallic minerals. Thermal conductivity exceeds that of steel, iron, lead and other metal materials. The thermal conductivity decreases with the increase of temperature. Even at very high temperature, graphite becomes an insulator.
3) Lubricity: the lubricating performance of graphite depends on the size of graphite scales. The larger the scales, the smaller the friction coefficient, and the better the lubricating performance.
4) Chemical stability: graphite has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.
5) Plasticity: graphite has good toughness and can be grown into very thin sheets.
6) Thermal shock resistance: graphite can withstand the sharp change of temperature without damage when used at room temperature. When the temperature changes suddenly, the volume of graphite changes little and cracks will not occur.
Of course, graphite electrode has all the above properties except better conductivity, so it’s no problem.