Graphite electrode refers to petroleum coke and needle coke as raw materials, coal pitch or vacuum glue as binder, which is prepared by calcination, compounding, kneading, pressing, roasting, graphitization and high-pressure machining. The working principle is to discharge the electric energy in the form of an electric arc in an electric arc furnace to heat and melt the conductor. The high-temperature heating body can be divided into ordinary power, high power and ultra high power according to different working power indexes. The graphite electrode used in the high-temperature oxidation environment of the electric arc furnace or the refining furnace will sublimate due to the high-temperature arc, and the high-temperature oxidation reaction between the electrode and the furnace gas, oxygen gas and corrosive gas will cause the continuous consumption of the graphite electrode to be reduced, and even breakage and breakage may occur. . The side oxidation of the graphite electrode accounts for 40%-60% of the total consumption. Oxidation of the side of the graphite electrode leads to a continuous decrease in the diameter of the arc of the graphite electrode, which increases the instability of the arc combustion and correspondingly increases the power consumption per ton of steel produced. Moreover, when the threaded portion of the electrode is oxidized, the threaded portion of the electrode joint is thinned, which may cause accidents in which the electrode is broken or the lower portion of the electrode is detached. The basic function of the graphite electrode anti-oxidation coating is to separate the graphite electrode material from the oxidative corrosion environment. Main features: 1. Greatly reduce the diffusion coefficient of oxygen; 2. It has good self-healing ability for thermal expansion and contraction, and can block cracks generated from the oxidation threshold (about 400 °C ) to the maximum service temperature. Erosion and infiltration, as well as reducing the inclusions in the steel, have a pure effect on the molten steel; 3 , the coating and the matrix can establish a good combination, thermal shock, thermal fatigue and thermal matching. In electric steelmaking , the consumption of graphite electrodes accounts for about 5 to 10 % of the cost of steelmaking. The single consumption of graphite electrodes for steelmaking in China is about 1 to 5 kg / ton of steel , and some are even higher , which is far from the ratio of 0.5 kg / ton of steel abroad.                High temperature oxidation curve and oxidation conductivity curve of graphite electrode According to many years of research and development, a large number of on-site inspections, paint development personnel of Beijing Zhisheng Weihua Chemical Co., Ltd., developed graphite electrode anti-oxidation coatings, ZS-1021 high temperature sealing coatings are mainly resistant to high temperature, oxidation and corrosion resistance. , carbides, the core temperature is an important antioxidant and coating technology too, the paint binder using a special Chinese Wei Sheng Zhi temperature solution, curable at room temperature, at high temperature into a polymerization temperature of the mesh structure an adhesive composition, as long as the material is inert oxidic sintering promoting effect by the energy of an oxide selected form the glass at high temperature, to enhance the airtight coating. ZS aspect temperature curable coating material enclosed stable at room temperature, the graphite electrode binding ability, and compatibility with a very graphite electrodes, on the other hand the binding agent can penetrate each other at an elevated temperature to form a unitary structure boat certain strength to erosion and corrosion from oxygen gas, and also there is a certain penetration of the graphite substrate, and the substrate to enhance the adhesion and thermal shock resistance.          Graphite electrode oxidation conductivity curve and ultrasonic oxidation curve Material composition of graphite electrode anti-oxidation coating This coating follows the following material selection principles: 1. Material with strong anti-oxidation ability and best comprehensive performance; 2. Select glass phase material that meets performance requirements as self-sealing material to make it work. In the temperature, it becomes a crack self-sealing material; 3. According to the standard free energy with oxygen, as a function of temperature, at the steelmaking temperature ( 1650-1750 °C ), a material with a higher affinity for oxygen than carbon - oxygen is selected, and priority is taken. Oxygen oxidizes itself and protects the graphite electrode. The volume of the new phase formed after oxidation is larger than that of the original phase, which helps to block the diffusion of oxygen into the inner channel and form an oxidation barrier. 4. At the working temperature, a large amount of inclusions such as AL2O3, SiO2, Fe2O3 in the molten steel can be adsorbed and reacted with the self to cause the various inclusions from the molten steel to gradually enter the coating. Therefore, the graphite electrode anti-oxidation coating has anti-oxidation, sealing and auxiliary electrode characteristics at different temperatures. ZS-1021 high temperature anti-oxidation sealing coating of Beijing Zhisheng Weihua Company adopts Zhisheng Weihua high temperature special solution, which is resistant to temperature up to 1700 °C and directly coated on various graphite electrode products to prevent graphite electrode from oxidizing at high temperature, graphite antioxidation The coating is convenient to construct, high in wear resistance, high in fire resistance and high temperature, which can greatly extend the service life of graphite. Zhisheng Weihua graphite electrode anti-oxidation coating adopts nano-ceramic Fish Scale-like structure, which melts and sinters the network phase state at high temperature, and has good compactness. It oxidizes decarburization layer on the surface of the material to prevent gas and material contact, and the hardness can reach 7-8H. , has a good impact resistance. ZS-1021 Zhisheng high temperature sealing coating itself is resistant to acid and alkali. It has no volatile substances at high temperature and normal temperature. It is environmentally friendly and does not react with quenching medium. It can effectively protect the material from chemical reactions at high temperatures and can be effective. Prevent high temperature oxidation rate of material materials to over 95% . The surface of the graphite electrode is coated with an anti-oxidation protective coating, which can form a protective layer which can resist both high temperature and oxidation, reduce the electrode consumption during steel making by 19%~50% , and prolong the service life of the electrode by 22%~60%. Save graphite electrode material and reduce the power consumption of the electrode. Chi Sheng Weihua developed high temperature oxidation coating graphite electrode, can effectively reduce electrode consumption, reduced consumption rate was determined more than 15%, the actual use, on the basis of 5.3 kg / ton of steel, the reduction by 13%, thereby reducing the steel cost, is a highly efficient energy saving valuable material.
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