graphite electrode steel plant
What is anti-oxidation coating graphite electrode
Anti-oxidation coating graphite electrode is a coated electrode made of graphite electrode as the substrate and sprayed with an oxidation-resistant coating on the surface of the body, and mainly use in graphite electrode steel plant. The preparation process is to fuse a thin layer of aluminum-based cermet on the surface of the processed graphite electrode. This conductive and oxidation resistant coating material is formed by the eutectic of aluminum and refractory mud of multiple components. Its characteristics and functions are as follows:
1. Provide the electrode with a high-efficiency oxygen barrier layer and a highly conductive outer surface layer, which can prevent oxidation of the electrode surface, reduce electrode consumption, and reduce the current density inside the electrode.
2. The anti-oxidation coating can withstand quite high temperature without melting, and the decomposition temperature of the coating is 1850. Above C.
3. The coating and the surface of the electrode are well combined, and have a similar linear expansion coefficient.
4. The conductivity of the coating is higher than that of the graphite electrode substrate, so most of the secondary current will be carried by the coating, which can reduce the resistance heating effect at the electrode joint and increase the current density through the electrode.