FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Proposed process comprises ply-by-ply application of refractory suspension of investment shell unit, melting out of patterns, drying and calcination. Starting from the shell second ply refractory suspension with oxygen-containing substance and boric acid in amount of 3-4 wt %.
EFFECT: higher quality of moulds and casts.
2 cl, 2 tbl, 1 ex
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