ANTI-STICK COATING FOR LOST FOAM CASTING AND METHOD OF PREPARATION THEREOF Russian patent published in 2017 - IPC B22C3/00 

FIELD: metallurgy.

SUBSTANCE: coating has the following composition, wt %: aqueous solution of aluminium boron phosphate concentrate (40-50), powdery periclase (0.8-1.5) nano-structured diamond powder (0.3-0.8), wetting agent OP- 7 (0.1-0.3), white electrocorundum 25A M5 (20-30), white electrocorundum 25A M40 (the rest). These ingredients are mixed and sonicated for 60-90 s at an intensity of 10-15 kW/m² and a frequency of 20-22 kHz with simultaneous bubbling at an air flow rate of 0.5-1.5 l/s⋅m². The introduction of an alumino-boron phosphate binder and OP-7 provides an improvement of the wetting and coating ability of the coating. The introduction of nanostructured diamond powder makes it possible to obtain a fine-grained structure of the surface layer of castings.

EFFECT: universality of the covering of polystyrene model by the type of alloy, configuration and overall dimensions of the castings.

2 cl, 4 tbl, 3 ex