Graphite round cake is a cylindrical product in graphite electrodes. It is a graphite block material made of post-stage petroleum coke and medium-temperature coal tar after crushing, screening, batching, molding, cooling and roasting, impregnation and graphitization. . It has the advantages of high temperature resistance, corrosion resistance, good electrical conductivity and light weight. Graphite round cakes are mainly used in solar thermal fields, smelting, mold, casting and semiconductor industries.
Graphite material performance advantages:
- High temperature resistance
The melting point of graphite is 3850±50℃. Even if it is burned by an ultra-high temperature arc, the weight loss is very small, and the thermal expansion coefficient is also small. The strength of graphite increases with increasing temperature, and at 2000°C, the strength of graphite doubles.
- Electrical and thermal conductivity
The conductivity of graphite is one hundred times higher than that of ordinary non-metallic minerals. The thermal conductivity exceeds that of metal materials such as steel, iron, and lead. The thermal conductivity decreases with increasing temperature, and even at high temperatures, graphite becomes a thermal insulator. Graphite can conduct electricity because each carbon atom in graphite forms only 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transport charges.
The lubricating performance of graphite depends on the size of the graphite flakes. The larger the flakes, the smaller the friction coefficient and the better the lubricating performance.
- Chemical stability
Graphite has good chemical stability at room temperature and is resistant to acid, alkali and organic solvent corrosion.
Graphite has good toughness and can be rolled into very thin sheets.
- Thermal shock resistance
When used at room temperature, graphite can withstand severe changes in temperature without damage. When the temperature changes suddenly, the volume of graphite changes little, and cracks will not occur.