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Selection of the temperature of casting the bronzes to plaster moulds

Pisarek B., Pawlak M.

Archives of Foundry Engineering

2009

Vol. 9, iss. 4

203-208

The results of the investigations of the process of solidification of the bronze CuSn5Zn5Pb5-C (B555) and CuSn10-C (B10) in the hot plaster mould show in the work. For four temperatures of casting: 1200 o C, 1180 o C, 1160 o C and 1140 o C was conducted the investi-gation: the size of contraction cavity, the fulfillment of the mould cavity formative the casts of test slats about the thickness: 4 mm, 0,8 mm and 0,5 mm. It was conducted the investigation the processes sets in the arrangement the cast-mould and X-ray analysis phase XRD of compound coming into being in indirect layer created among mould and cast in the result of the thermal decomposition of the anhydrite. It results that the temperature 1140 o C is the optimum temperature of casting the bronze to hot plaster mould from carried out investigations. The minimum thickness of the wall of the cast from the bronze B555 is 0.5 mm, and from the bronze B10 0.8 mm. The realization of casts about thinner walls is made difficult because of giving off formed gases in the result of the thermal decomposition of the anhydrite. The products of the decomposition of the anhydrite react with elements steps in the chemical composition of studied bronzes, create in the arrangement the cast-mould the indirect layer folded from: sulphites, sulphides, oxides and clean metals (Pb) or their compounds, especially Sn and Sb.