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The results show that the carbides of group II and group III can reduce the undercooling and increase the number of eutectic clusters(aluminum oxide abrasive), while group IV elements (TIC, z4c, HC) have little effect on the number of eutectic clusters(iron carbon steel and 1.5% CaO). When the sintering material contains 2.5% CaCO3(steel grid), the eutectic cluster number is 350 / em When sintered with 5% CaCO3, the number of eutectic clusters is 110 / em2.


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In addition, some tests have shown that when the sulfur content of the UN inoculated gray cast iron increases in a certain range(black silicon carbide), the probability of matrix becoming the crystal core is very high, the graphitization can be promoted by providing effective crystal nucleus to the molten iron(glass bead blasting media suppliers). However, the number of eutectic clusters tends to decrease with the increase of the amount of calcium carbide in the sinter.


(cheap alumina wholesale suppliers saudi arabia)In addition, the sinter containing CaO also has certain inoculation effect, and the number of eutectic clusters after inoculation is 50 / em(white fused alumina). The lattice mismatch between sulfide and graphite can be calculated according to the distance between the close packed planes and the corresponding carbon atoms in the graphite substrate. B. As early as 1960s(garnet suppliers), lux proposed that calcium carbide can be used as graphite nucleation matrix.


It has been reported that when the mismatch degree is less than 6%(green silicon carbide), and the nucleation probability is significantly reduced when the mismatch is between 6% and 12%. Calcium, cerium, steel, silicon, bond sulfides can effectively become graphite nucleation matrix, and the number of eutectic groups will increase accordingly(garnet abrasive). It is found that CaCO3 crystal has face centered cubic structure at high temperature, and carbon exists in the form of C.(cheap alumina wholesale suppliers saudi arabia)


Based on the (111) crystal plane, the distance between two adjacent C is 4.19 × 10 ° m, which is very close to the atomic spacing of 4.25 × 10 ° m in graphite lattice, and the lattice fitness is very good(white aluminum oxide). The sulfides of magnesium and manganese belong to the materials that may become the core of graphite crystallization(emery abrasive). B carbide as graphite nucleation matrix B. lux proposed that calcium carbide could be graphite nucleation matrix in 1960s.


The structure analysis of carbides with sodium chloride lattice shows that the carbides are face centered cubic at high temperature, and the alkali atoms exist in CG ion state(silicon carbide abrasive). It is found that the carbides of group 1, II and III can reduce the undercooling and increase the number of eutectic clusters, while group IV elements (TIC, z4c, HC) have little effect on the number of eutectic clusters(synthetic corundum). Calcium carbide (CAC) is one of the most effective elements.


(cheap alumina wholesale suppliers saudi arabia)The results show that the number of eutectic clusters of Fe-C-Si ternary alloy is 8.5/em(white corundum), and the eutectic group number increases sharply when the sintered material of iron silicon steel alloy and calcium carbide powder is added (calcium carbide is very light and has poor wettability with liquid iron carbon silicon alloy(aluminum oxide grit), so it can not be directly added into calcium carbide powder), and finally form the core of graphite junction.


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