SAND FOR MAKING CASTING MOLDS AND CORES
FIELD: foundry. ^ SUBSTANCE: sand contains, mass %: refractory filler in the form of powder of electrical-engineering periclase under-melted at producing it, 40.0 - 50.0; binder in the form of melt glass, 5.0 - 12.0; powder of scrap of used casting molds of under-melted material, 45.0 - 48.0. Fracti...
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Zusammenfassung: | FIELD: foundry. ^ SUBSTANCE: sand contains, mass %: refractory filler in the form of powder of electrical-engineering periclase under-melted at producing it, 40.0 - 50.0; binder in the form of melt glass, 5.0 - 12.0; powder of scrap of used casting molds of under-melted material, 45.0 - 48.0. Fraction size of powder of under-melted electrical-engineering periclase production and powder of scrap of used casting molds of under-melted material is in range 0.05 -2.50 mm. Relation of fractions consists, mass %: 2.50 - 1.60 mm, 43.0 - 50.0; 1.60 - 0.315 mm, 45.0 - 50.0; 0,315 - 0.05 mm, 5.0 - 7.0. ^ EFFECT: improved gas permeability, lowered collapsibility of casting molds and cores. ^ 2 tbl, 1 ex |
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