Characterization of Coated Sand Cores from Two Different Binder Systems for Grey Iron Castings

Research output: Contribution to conferencePoster – Annual report year: 2009Research

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Expansion defects on the surface of the castings include sand burn-in, metal penetration and/or veining, finning or scab. Veining or finning and metal penetration are of interest. These defects are associated with silica sand and result from the penetration of liquid metal into cracks formed during differential expansion of the core during heating. The rapid expansion of silica sand up to 600 oC and especially at 573 oC, where the α – β phase transformation occurs, is the cause of stresses in the core system. These stresses cause crack formation and metal melt flows into these cracks causing finning or veining and metal penetration defects. The use of refractory coatings on cores is fundamental to obtaining acceptable casting surface quality and is used on resin bonded cores in production foundries. In this study new sol gel-coated sand cores made from coldbox and furan binder systems were investigated for their casting properties.
Original languageEnglish
Publication date2009
Publication statusPublished - 2009
EventEuropean Congress on Advanced Materials and Processes 2009 - Glasgow, United Kingdom
Duration: 7 Sep 200910 Sep 2009


ConferenceEuropean Congress on Advanced Materials and Processes 2009
CountryUnited Kingdom
Internet address

ID: 4276554