inEPCDuring the filling process of casting, mass transfer serves as both the carrier of heat transfer and is restricted by it. In aluminium alloy6During the pouring process of casting, the pattern mainly melts after being heated and rarely decomposes, and the temperature around the molding sand is very low,The heat transfer during the filling process has little influence on the distribution of the amount of residual pyrolysis products in the dry sand. The liquid pyrolysis products that penetrate the coating layer only undergo re-decomposition at the interface between the coating and the dry sand or within a very short distance from the coating surface. And in cast iron casting;The degree of pattern cracking is relatively large, and the temperature of the casting and mold is relatively high. The pyrolysis products that transfer more slowly will be carbonized, and the temperature in the mold is higher than600℃At this part, the already condensed pyrolysis products will be evaporated again, causing them to spread far away. It can be seen that both heat and mass transfer are very important in cast iron casting. There is also a special mass transfer phenomenon in the cast iron casting process, that is, at a certain distance from the coating in the dry sand, there is an area without pyrolysis products. Its formation is due to the fact that the temperature at this location is sufficient to evaporate the condensed pyrolysis products and cause them to diffuse outward, but not to further crack them.

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