FIELD: foundry. SUBSTANCE: self-curing mix contains, mas>%: finely divided powder in production of periclase powders for electrical engineering 1.0-5.0; orthophosphoric acid 4.0-6.0; oxalic acid 0.1-0.15; the balance, refractory filler. Magnesium-containing powder used in the sand features stable results, both, in dispersity and in chemical composition and contains at least 96 mas.% of magnesium oxide that improves mix properties. EFFECT: extended range of regulation of survivability and speed of mix curing, higher strength of cores and casting molds and improved sand knocking out.
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|---|---|---|---|
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