In the lost foam casting process, the effective use of coatings containing mica components plays a very important role. The mica coating forms a coating on the surface of the mold that acts to "protect", "support", and "separate" the surface of the foam. When the liquid metal is filled, the first is the transmission of the foam-like pyrolysis product through the coating. Its transport is affected by the type and amount of decomposition products, coating properties and pressure. The mica-containing coating layer not only separates the molten metal that replaces the foam pattern from the binderless dry sand behind it, but also forms a “barrier” between the molding sand and the molten metal; more importantly, While keeping the cavity stable, the products of the thermal decomposition of the pattern (including liquefied objects and vapors) pass smoothly. If the liquid liquefaction of the pattern and the liquid decomposition of the pattern can be oozing out through the coating in time, it is undoubtedly very advantageous for the smooth filling of the filling and the guarantee and improvement of the quality of the casting.

 

       Therefore, the lost foam casting coating should have good coating properties, and it is easy to apply a certain thickness of the coating with mica on the surface of the foam pattern; at the same time, it is also hoped that the lacquer coating with the mica powder material can liquefy the foam pattern. The product has good wettability, and the ten liquefied products are discharged through the coating to ensure the quality of the casting. The wood topic focuses on the effect of mica on the coating performance of the coating and the infiltration performance of the coating layer on the liquefied product of the foam pattern.