Core Coating

Core coating is a refractory material applied to the surface of foundry cores used in metal casting processes. It serves as a barrier between the molten metal and the core sand, preventing metal penetration into the core, facilitating core removal after casting, and improving the surface quality of the final casting. The coating is typically applied as a slurry or spray and then dried or cured before the casting process.

The coating creates a thermally stable, non-wettable barrier on the core surface. During metal pouring, it prevents molten metal from penetrating into the core sand pores, reduces gas evolution from the core, and provides a smooth interface that allows for clean core removal after solidification. The coating's refractory properties withstand high temperatures while maintaining integrity.