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2 2018

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Identification of Gas Products from Pyrolysis Process of Waxes Used in Lost-Wax Casting Technology

Żymankowska-Kumon S., Kolczyk-Tylka J.

Journal of Casting & Materials Engineering

2018

Vol. 2, no. 3

53--56

Foundry waxes currently used in lost-wax casting technology are composed of paraffin, stearin, and – to a lesser extent – ceresin, polyethylene wax, and other natural and synthetic waxes. Most of these compounds are non-toxic; however, they may release aromatic hydrocarbons as a result of exposure to high temperatures. Based on a chromatographic analysis (pyrolysis gas chromatography-mass spectrometry, Py-GC/MS), the compounds that are separated from the popular wax mixtures used in foundries were evaluated (as well as the impact they may have on foundry workers). For this purpose, the three main stages of the process (wax, burnout, and pouring) were analyzed, and the appropriate test temperature was chosen (similar to the actual conditions during the process).

Casting Technology Experiment and Computer Modeling of Ornaments from Bronze Age

Garbacz-Klempka A., Suchy J. S., Kwak Z., Długosz P., Stolarczyk T.

Archives of Metallurgy and Materials

2018

Vol. 63, iss. 3

1329--1337

The casting workshop was discovered with numerous artifacts, confirming the existence of the manufacturing process of metal ornaments using ceramic molds and investment casting technology in Lower Silesia (Poland) in 7-6 BC. The research has yielded significant technological information about the bronze casting field, especially the alloys that were used and the artifacts that were made from them. Based on the analyses, the model alloys were experimentally reconstructed. Taking advantage of the computer-modeling method, a geometric visualization of the bronze bracelets was performed; subsequently, we simulated pouring liquid metal in the ceramic molds and observed the alloy solidification. These steps made it possible to better understand the casting processes from the perspective of the mold technology as well as the melting and casting of alloys.