metallurgical silicon carbide
When steel is used, silicon carbide is often used as a strong deoxidizer. In practical use, it can achieve rapid deoxidation and good deoxidation effect. The main production mode of silicon carbide is direct smelting and partial furnace processing and production. Silicon is usually smelted in the second way. It is mainly processed from carbon, calcium carbide, industrial silicon and ferrosilicon producer by-products and refractories.
Silicon carbide has good desulfurization, deoxidation, temperature rise, alloying effect, the price is relatively cheap, can reduce the production cost very well. In recent years, some metallurgical products in China have been used!
Discussion on the performance of silicon carbide in metallurgy
Discussion on the high temperature resistance of silicon carbide
Silicon carbide is oxidized in the air, and a layer of silica is formed on the surface of the particles. The diffusion of oxygen in the silica has a very low iron alloy coefficient, so that the oxide layer of the surface layer protects the interior. The oxidation resistance of silicon carbide can resist the erosion of high temperature oxidizing gas in the furnace, and the burning loss is small in the gas phase of the surface of the molten pool, but when the temperature exceeds 1627 ° C, it exhibits significant instability under high temperature oxidation atmosphere. It is quickly oxidized.
Discussion on Deoxidation Performance of Silicon Carbide
The free energy change valuesof SiC for deoxygenation are all less than zero. Silicon carbide reacts with oxygen in the liquid slag phase or liquid metal,
The release of a large amount of heat can effectively reduce the iron oxide in the steel slag from 5% to 15% to 0.5% or lower, thereby increasing the partition coefficient of sulfur element in the slag and functioning as a desulfurization. In addition, the density of silicon carbide is 3.2g per square, which is between the density of molten steel and steel slag. The reaction of steel slag to form carbon oxide can also agitate in the molten pool, creating better kinetic conditions for deoxidation and promoting The diffusion of oxygen in the steel and the discharge of carbon monoxide from the reaction can also reduce the content of other gases in the molten steel. After the deoxidation reaction of silicon carbide, the molten steel will increase the effect of silicon, carbon, degassing and de-intercalation. The deoxidation reaction is an exothermic reaction, which will increase the temperature of the steelmaking process.
By discussing the metallurgical properties of silicon carbide, you can quickly grasp the various characteristics of silicon carbide, better master the methods in use, improve the understanding of silicon carbide, and thus reduce the cost and improve the use effect and benefits of silicon carbide!
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