FIELD: foundry production.
SUBSTANCE: mixture for the manufacture of moulds and rods contains, wt.%: liquid glass - 3.5-4.0, moulding clay - 2.0-4.0, crushed silicone rubber waste - 1.5-2.0, working mixture - 40-50, 4-8% aqueous solution of polyvinyl alcohol - 1.5-2.0 and quartz sand - the rest. When the mixture is heated, silicone particles are destroyed with the release of carbon dioxide and fine amorphous silicon dioxide. Fine amorphous silicon dioxide is also contained in the circulating mixture. When preparing the mixture, fine particles of amorphous silicon dioxide partially dissolve in droplets of liquid glass, increasing its modulus. Some of the microparticles of amorphous silicon dioxide do not have time to dissolve in the liquid glass before it hardens and remain in the film of the hardened binder, and when the mould or rod is heated and further cooled, they play the role of micropores, facilitating the process of knocking out the rods.
EFFECT: increasing gas permeability and compressive strength and reducing residual strength.
5 cl, 8 tbl, 1 ex
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