What are the uses of silicon-carbon alloy?
May 29, 2024
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1. Silicon-carbon alloy is suitable for deoxidation of various common steels and castings, and increases silicon and carbon. It has rapid deoxidation, early slag formation, and a strong reducing atmosphere. It effectively improves the element recovery rate, greatly reduces the smelting cost, and can stabilize the quality of molten iron. It has the function of refining grains, removing harmful impurities in molten iron, making the molten iron casting temperature high, the quality of the ingot good, and the cost low.
2. Since silicon-carbon alloy contains silicon and carbon, silicon enters the molten iron during the smelting process, and most of the carbon burns. It is worth reminding that the main element of the composite additive is high-content silicon carbide scraps, because silicon carbide (sic) particles enter the casting and serve as the core base, forming a core through it. The finer and more silicon carbide particles have a stronger nucleation ability. Observed under TEM; the silicon carbide particles are effectively bonded to the matrix interface, there are high-density dislocations around the particles, and the crystallization increases, resulting in grain refinement, and the number of eutectic groups and pearlite has changed significantly. Because silicon-carbon alloy has strong nucleation ability, it can change the graphite morphology and refine the organization, thereby improving mechanical properties and anti-leakage, so the waste rate is reduced and the reflow rate is reduced.
3. At high temperatures, silicon carbide in silicon-carbon alloy decomposes, and carbon in ionic state easily reacts with oxygen. They first reduce the oxidation of molten iron and then become the crystallization core of graphite. Therefore, the graphite organization of gray iron castings smelted with silicon-carbon alloy is very good. This is inevitable. This is the direction of high-grade gray iron smelting!
