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2 Archives of Foundry Engineering

2 2015

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The Aging Time Effects of the Pre-expanded Polystyrene on the Patterns Mechanical Properties

Buczkowska K., Pacyniak T.

Archives of Foundry Engineering

2015

Vol. 15, iss. 1

131--137

The aging granulate is to activate the blowing agent during the manufacturing process to granulate models can re-expand and shape the model of well-sintered granules, smooth surface and a suitable mechanical strength. The article presents the results of studies which aim was to determine the optimum time for aging pre-foamed granules for pre-selected raw materials. The testing samples were shaped in an autoclave, with constant parameters sintering time and temperature. Samples were made at 30 minute intervals. Models have been subjected to flexural strength and hardness.

Influence of Ceramic Coatings on the Mechanical Properties of Ceramic Moulds Used in the Replicast CS Technology

Buczkowska K., Pacyniak T.

Archives of Foundry Engineering

2015

Vol. 15, iss. 3 spec.

112--118

The paper discusses the issues related to the Replicast CS technology. The research concerning the indication of the bending strength of ceramic moulds depending on the type and configuration of the shells will determine the effect of the type of binder and powder on the mechanical properties of shell moulds. The experimental studies presented in the paper include the manufacture of polystyrene models, followed by the application of 6 layers of ceramic coatings of different types and configurations on sets of polystyrene and wax models. Next, the studies test the bending strength of the obtained samples of ceramic moulds, depending on the type and configuration of the coatings. The presented research has shown the relationship between the different configurations of the materials used for the manufacture of ceramic coatings and their bending strength. It has been shown that, by the appropriate selection of the ceramic coatings, it is possible to obtain ceramic moulds with a possibly high bending strength.