KOZAKIEWICZ Łukasz Silesian University of Technology

Spoluautoři CHOLEWA Mirosław

In the article the results of testing the moulding sand based on alumino-silicate microspheres matrix with organic binder were presented. Developed moulding sand, which application is seen in the role of moulding or/and core, is supposed to be used for the implementation of thin-walled casting, which examples are so-called skeletal castings (3D), characterized by a small thickness of wall and strongly developed heat transfer surface in the process of crystallization. Over the casts of this type, the design and methods of manufacture, since years have lasted the research work in the Department of Foundry of Silesian University of Technology. The matrix is characterized by good thermal insulation properties and a small particle size, and the synthetic organic binder with good mechanical properties (among the others the delayed setting time and good rheological properties should be distinguished) and high chemical resistance. Moulding or core sand should also provide a low surface roughness of the casting and the preservation of close tolerances on shape and dimensions. At the moment there is no normative regulations for the design of casting process and technology of preparation of moulding and/or core sand used in the production of castings with extremely small dimensions of the wall or of a particularly high surface area heat dissipation during crystallization. The subject of researches are basic technology properties of new moulding sand such as compressive strength depending on the amount of selected binders for foundry advanced application. The results confirmed the benefits of the newly developed technology of the moulding sands.