Abstract

Usage of fly ash in foundry has long been established for casting processes like sand casting & ceramic shell moulding. However, no effort was made if fly ash can be a successful replacement for shell moulding. Shell moulding is a thin-walled shell created from applying a sand-resin mixture around a pattern. Shell moulding- finds vast application in automobile, automotive and locomotive industries owing to its versatility, accuracy and surface finish. This paper presents by comparison the effect of fly ash on various moulding properties like strength, permeability, hardness and surface finish. The properties of various weight percentages of fly ash and shell sand reveal rule out of fly ash as a complete substitute for shell sand but can be a partial substitute for shell sand contributing to the cost reduction in procurement of shell sand. The castings obtained were checked for quality and the weight percentage of fly ash to shell sand established.

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