FIELD: metallurgy.
SUBSTANCE: proposed method comprises application of different-composition protective-separation coatings on the mould surface before teeming of fused metal. Coating, 0.1-0.2 mm thick, consisting of ultrafine powder of magnesium oxide in amount of 20-25 wt % and industrial oil in amount of 78-80 wt %. Coating, 0.2-0.3 mm thick, consisting of ultrafine powder of zirconium oxide in amount of 20-25 wt % and industrial oil in amount of 75-80 wt %. Coating, 0.3-0.4 mm thick, consisting of ultrafine powder of zirconium oxide in amount of 20-25 wt % and industrial oil in amount of 75-80 wt %.
EFFECT: directed crystallisation of metal, higher strength of casts.
1 dwg, 1 ex
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