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Therefore, this kind of silica particles can not be an effective nucleation matrix(steel shot abrasive). Because the free energy (△ C) of Cao and CAS is more negative than that of CaCO3, calcium carbide must react with sulfur and oxygen in molten iron, and part of calcium carbide will be replaced by calcium oxide and calcium sulfide(100 grit aluminum oxide). Because the branches of flake graphite are intermittently connected with the base metal, it is difficult to detect the core material.

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Therefore, the spherical graphite is studied(glass beads manufacturers). Only this kind of surface can make carbon epitaxial growth on it and form surface graphite layer. The carbon (mostly in the form of Hypereutectic graphite) reacts with calcium to produce calcium carbide, and the surface graphite appears quickly Layer, may become graphite nucleus(black synthetic corundum). The important condition is that the silicon dioxide crystal must be pure and have a pure silicon dioxide crystal surface.

(cheapest aluminium oxide manufacturers vietnam)At this time, oxygen begins to increase the undercooling of eutectic(brown aluminium oxide). The experiment shows that when ferrosilicon is added into molten iron, but when calcium and silicon are added into molten iron at the same time, silicon rich micro region will be formed in the molten iron. In this micro region, calcium and other similar elements exist in the form of fine metal droplets(black fused alumina). Basically, there is no oxygen and no sulfur in the molten iron.

Although the hot metal is oxygen supersaturated, the test did not achieve the desired results(glass bead abrasive). When ferrosilicon is added to the molten iron containing supersaturated oxygen, the dissolved and oxidized silicon and the molten iron form SiO2 crystal. The silicon dioxide crystal has a good matching relationship with the graphite lattice base surface(120 grit aluminum oxide harbor freight), and these fine crystals can eventually become graphite nucleation matrix.(cheapest aluminium oxide manufacturers vietnam)

However, the disadvantage of using CAC and other carbides as nucleation matrix lies in their poor thermodynamic stability(brown fused alumina). The negative values of free energy of formation of CaC2, SiC, 7C, tic and MNC are small, and they are easy to combine with sulfur and oxygen in molten iron to form more stable compounds. Carbon atoms can not epitaxial grow on this surface(pink fused alumina). There are some conditions for silica to become an effective nucleation matrix.

(cheapest aluminium oxide manufacturers vietnam)The reason is that the added silicon dioxide particles have been polluted before entering the molten iron(garnet abrasive price), and the surface of the particles is covered by pollutants and the crystalline surface of SiO2 is lost. The experimental results show that the effectiveness of using silica as the nucleation matrix depends on whether the silicon content in molten iron and the concentration of dissolved oxygen are high enough(80 grit aluminum oxide blasting media).

The process of silicon dioxide becoming nucleation matrix is essentially the process of deoxidation with silicon(brown aluminum oxide). The more deoxidation, the more effective graphite nucleation matrix and graphite core can be produced, and the effect of promoting graphitization is stronger. However, due to the decomposition of silica, the promotion of graphitization decreases with the increase of incubation time(silicon carbide 180 grit). Oxygen returns to the molten iron.