Abstract
Skeleton castings macrostructure can be shaped in many ways, by choosing an appropriate material of cores and manufacturing technologies. Important factor, which puts foundry techniques over the other technologies of periodic cellular materials, is ability to adjust mechanical properties by changing the microstructure of an alloy from which the casting is made. The influence on the microstructure of the skeleton casting can be implemented by choosing the thermal properties, mainly thermal conductivity factor, of mould and core materials. Macro- and microstructure of skeleton castings with octahedron elementary cells was presented in this paper. The analysis concerns the differences in morphology of eutectic silicone depending on the location of measurements cross sections areas. The use of thermo-insulating material with appropriate properties assures correct fill of mould cavity and homogeneous microstructure on whole volume of skeleton casting. The selection of technological parameters of the casting process if very important as well.
Highlights
Mechanical, thermal acoustic properties of cellular metals assure them wide range of practical use
Lost wax techniques are used for periodic cellular metals and in connection with antigravity casting allow to obtain skeleton casting with diameter of ligaments about 1.5mm
Analysis of size distribution of silicone crystals showed that the most of the silicone crystals are less than 20 μm
Summary
Mechanical, thermal acoustic properties of cellular metals assure them wide range of practical use. Technologies are making possible to manufacture ultralight constructions with good impact energy absorbing, heat conduction or dissipation [1]. Besides excellent thermo-mechanical properties, other aspects like for example production costs or technology accessibility are very important. Cellular materials like metallic foams are well known [2,3,4]. Development of such materials is enforced by progress in manufacturing techniques and better tools for designing and simulation of mechanical properties. Unfavorable aspect of cellular metals is random geometry and size of pores which preclude predicting mechanical properties of such material
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