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Effect of bentonite addition on residual strength of microwave-hardened waterglass-containing moulding sands

Stachowicz M., Granat K., Nowak D.

Archives of Foundry Engineering

2011

Vol. 11, iss. 3 spec.

199--204

The paper presents results of a preliminary research of the effect of bentonite addition on residual strength of microwave-hardened moulding sands, containing sodium waterglass. Strength was determined at ambient temperature, on cylindrical specimens baked in an oven. Moulding sands for examinations were based on high-silica sand with addition of 2.5 % of non-modified, domestic-made waterglass grade 145. The prepared standard cylindrical specimens were hardened using the innovative microwave heating process and next baked for 30 minutes at temp eratures between 100 and 1200 °C. Strength parameters of the specimens were determined on the specimens cooled-down to ambient temperature. The obtained results were compared with literature data to evaluate the effect of the applied hardening method and of the special additive on residual strength as a function of baking temperature. A favourable effect was found of both the innovative heating process and the applied bentonite addition.