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However, the carbon content of molten iron increases and the amount of combined carbon increases due to the dissolution of graphite in the high temperature casting sample, resulting in fine graphite(high purity fused aluminum oxide). This may be the main reason why people agree with the nucleation theory of graphite particles(aluminum oxide 180 grit blast media). The phenomenon that the incubation effect decreases with time is called gestational decline.

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It is found in the practice of inoculation of cast iron that the inoculation effect increases sharply in a short period of time after inoculant is added into molten iron(white fused aluminum oxide). But after a period of time, the inoculation reached a peak, then began to weaken, and finally disappeared completely(brown aluminum oxide factory). Generally speaking, the causes of inoculation decline of cast iron mainly include the following aspects.(cheap aluminium oxide powder wholesale price australia)

It is necessary to further explore the thermodynamic conditions for the nucleation of graphite on homogeneous materials in order to confirm the universality of this viewpoint(brown fused alumina suppliers). All kinds of inoculants have the approximate number of eutectic clusters that can be produced when the inoculants have the maximum inoculation effect(brown aluminum oxide sandblasting). It is believed that there are carbon particles or groups of carbon atoms in liquid cast iron. 

(cheap aluminium oxide powder wholesale price australia)This is because the silicon concentration in the silicon rich micro region formed by high silicon iron in molten iron is high(brown aluminium oxide), and the micro region is kept for a long time, which is conducive to the stable formation of silicon dioxide and sufficient time to complete the nucleation process(brown aluminum oxide 16 grit). The inoculation method of cast iron without inoculant has been developed abroad. The mechanical properties of the material decreased.

Therefore, it is suggested that graphite particles should exist in liquid cast iron before solidification(aluminum oxide 30 or 40 grit). The presence of submicroscopic graphite particles or clusters of carbon atoms in liquid cast iron has been discussed. It is also believed that the nucleation of carbon atoms on graphite particles is much easier than that on other materials(brown aluminium oxide 24 mesh), because their atomic sizes are the same and there is no problem of excessive mismatch.

The increase of eutectic undercooling leads to the increase of white cast iron tendency(brown aluminum oxide). The effective time of inoculation mainly depends on the melting rate of inoculant in molten iron and the carbon and silicon atoms that lead to the homogenization of hot metal composition(white fused alumina suppliers). As long as one or two of the above phenomena are very obvious, it shows that the batch of castings have been inoculated and degenerated.(cheap aluminium oxide powder wholesale price australia) 

The results show that the depth of the white spot on the triangular test piece poured in the production site is increased(white aluminium oxide super fine). From the cross-section of the test piece, there is a pockmarked area where graphite and cementite coexist in the gray area and white area or within the gray mouth area, and the number of eutectic clusters decreases significantly(aluminium oxide blasting grit). These phenomena are compared with the results of intact inoculation.

(cheap aluminium oxide powder wholesale price australia)Some thin sections have white spots(brown fused alumina). The nucleation effect of graphite produced by inoculant is related to the viscosity of hot metal. The most commonly used graphitization inoculants are fesi75 ferrosilicon containing a small amount of aluminum and calcium, composite ferrosilicon containing barium, gill and other elements, and silicon calcium alloy(wholesale brown fused alumina). Gestational decline is generally manifested in the following phenomena.