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Two different types of age-hardening behaviors in commercial dental gold alloys.

Hisatsune K, Shiraishi T, Takuma Y, Tanaka Y, Luciano RH

Division of Dental and Biomedical Materials Science, Department of Developmental and Reconstructive Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, 852-8588, Japan. hisatune@net.nagasaki-u.ac.jp

Age-hardening behavior during continuous heating in commercial dental casting gold alloys was investigated by means of electrical resistivity measurements, hardness tests and X-ray diffraction. Two distinguishable behaviors were detected. It is considered that the difference was attributed to the amount of platinum, and the atomic ratio of gold and copper in each alloy. The phase transformations during continuous heating progressed into two steps (stages I and II). Increase of the platinum addition in gold-based alloys retards the rate of the reaction and decreases remarkably the amount of stage I.

Published 4 June 2007 in J Mater Sci Mater Med, 18(4): 577-81.
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