Abstract
Recently, some side effects of Pd, such as allergies, were found, and the risk of using Pd in dental casting alloys was raised. The purpose of the present investigation is to report a Pd-free high gold alloy for porcelain bonding. Emphasis is put on the effect of heat treatment on the mechanical properties of the alloy. The gold alloy was based on the ternary system of Au−Pt−Zn with a nominal composition of 86Au-11Pt-1.5Zn-0.5In-0.7Rh-0.2Fe-0.1Ir (wt.%). Both the hardness and tensile strength of the as-cast alloy can be significantly improved by heat treatment at 980°C for 15 min followed by bench cooling, but can't be raised by conventional solution treatment followed by ageing. The strengthening could be attributed to homogenization of microstructure and alloying elements and precipitation of new fine particles. It is suggested that the cast framework of the present new Pd-free alloy could be heat treated before actual firing, and this will improve the processing properties of the alloy during firing.
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JN Wang: Group leader, professor of Materials Science. B.Sc. in 1984, and Ph.D. in 1991. Currently working on development of new metallic materials (including gold alloys). Having authored or co-authored more than 100 technical papers published in international journals.
WB Liu: M.Sc. in 2006. Presently working in a company located at Shanghai.
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Wang, J., Liu, W. A Pd-free high gold dental alloy for porcelain bonding. Gold Bull 39, 114–120 (2006). https://doi.org/10.1007/BF03215538
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DOI: https://doi.org/10.1007/BF03215538