Granularly unbind Materials for Casting Composite Moulds

Abstract

This paper present some partial result based on this idea (of pollution prevention) the domain of making composite-casting moulds (in time of casting, solidifying, and alloy cooling). Casting process impose temporary or permanent moulds in classical approach, capable to assure the liquid alloy flow and cooling. The moulds made by bound mixtures are considerer the most dangerous sources in foundries. Initially the mould is made only by gasified model and dry siliceous sand, the casting of the alloy concomitant with the thermo-destruction of the model and decomposing the products of thermo-destruction , filtering through the mould wall it makes possible realization the mould composite- siliceous- graphite, favorable the process of interface metal-mould. The elimination of the binder and of the separation plane, the raising of thermal conductivity of the mould and even the retention of thermo-destruction products in inter-granular spaces could be a solution to minimize the contamination in foundry.