Graphite production further processing Carbon （进一步处理的碳石墨生产）.pdfVIP

Graphite production further processing Graphite blocks Graphite production further processing • Introduction • Purification • Graphitising • Machining • Graphitisation • High grades surface furnaces finishing • Coating • Coating • Castner • Chemical vapour • Inductively heated deposition furnaces Some applications, such as graphite electrodes for the electric arc furnace require a higher thermal and electrical conductivity than that of baked carbon materials. These synthetic graphites normally follow a production process similar to that of baked carbon (forming, impregnation, rebaking) but require an additional process step, that of graphitisation where temperatures of around 3000°C are achieved. Heat treatment - graphitising The final step in graphite manufacture is a conversion of baked carbon to graphite, called graphitising, i.e. heat-treating the material at temperatures in the region of 2600°C – 3300°C. During the graphitising process, the more or less pre-ordered carbon (turbostratic carbon) is converted into a three-dimensionally ordered graphite structure. Depending on the raw materials and the processing parameters, various degrees of convergence to the ideal structure of a graphite single crystal are achieved. Since graphitisation increases the lattice order and produces smaller layer distances, it simultaneously leads to a considerable growth of ordered domains. However, the degree of order that can