Influence of water-glass grade and quantity on residual strength of microwave-hardened moulding sands. Part 2
Journal Title: Archiwum Odlewnictwa - Year 2011, Vol 11, Issue 2
Abstract
The paper continues dealing with the issues of influence of microwave hardening on mechanical properties of waterglass-based moulding sands. This second part of the research includes examining moulding sands containing 1.5, 2.5 and 3.5% of hydrated sodium silicate grade 150. Standardised, microwave-hardened cylindrical specimens for mechanical testing were held at temperatures from 100 to 1200 °C for 30 minutes, cooled-down to ambient temperature and then their residual strength was determined. An attempt was made to explain the effect of microwave hardening on strength of moulding sands as a function of baking temperature, supported by SEM observations of the baked sandmixes. On the grounds of these observations, destruction nature of linking bridges was identified. It was found that the applied microwave hardening is beneficial by reducing residual strength of waterglass-containing moulding sands and thus improving their knockout properties.
Authors and Affiliations
M. Stachowicz, K. Granat, D. Nowak
Keywords
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