Silicon carbide
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Silicon carbide is a non-metallic mineral product synthesized from quartz sand and petroleum coke at high temperatures exceeding 1,800°C. It serves as an essential raw material widely used in metallurgical deoxidation, the production of refractory materials, and industries such as electronics, machinery, and mold manufacturing. Silicon carbide is a powerful molten iron deoxidizer that purifies the iron melt, enhances its properties, and reduces costs. It exhibits a uniform and stable carbon-to-silicon ratio, with extremely low levels of harmful impurities like aluminum and phosphorus, as well as inert gases. In the early stages, it effectively controls the corrosion of the furnace lining caused by FeO (ferric oxide), preventing the formation of ferro‑silicate (FeO·SiO2) and thereby extending the service life of the furnace walls. It provides long-lasting inoculation effects: a silica film coats the surface of silicon carbide crystals, prolonging the time during which the core remains active, reducing the tendency for cementite and white cast iron to form, while also optimizing graphite morphology and stabilizing machinability. For ductile iron, pre‑deoxidized molten iron experiences reduced erosion and oxidation of magnesium, allowing for a roughly 10% reduction in the amount of spheroidizing agent required and mitigating the tendency toward white cast iron. For gray cast iron, adding silicon carbide helps prevent carbide precipitation, delays graphitization decay, and increases the number of graphite nuclei. Based on petroleum coke, it features a narrowly distributed particle size that can be tailored to specific needs, making it easy to use.
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