Abstract
Experimental data on the effects of various factors on the incidence of shrinkage porosity in cast gold jewellery items have been accumulated in recent years. Consideration of these data leads to the conclusion that certain of these effects are unpredictable, or ‘chaotic’. Possible reasons for this are presented and available experimental data are discussed and illustrated in terms of this new approach to shrinkage porosity. Interactions between the effects of different factors are illustrated and discussed as also contributing to the unpredictability of results in some instances.
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The author is head of the Analytical and Metallurgy Department at the German Precious Metals Research Institute (Forschungsinstitut für Edelmetalle und Metallchemie [FEM]), Schwäbisch Gmünd, Germany. He has conducted extensive research into the precious metals and their applications, and has made significant contributions to our current understanding of the investment casting of carat gold jewellery alloys and the caused of defect formation. He has published numerous articles, including several inGold Bulletin andGold Technology.
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Ott, D., Rapson, W. Chaos in casting: An approach to shrinkage porosity. Gold Bull 30, 13–19 (1997). https://doi.org/10.1007/BF03214752
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DOI: https://doi.org/10.1007/BF03214752