Original scientific paper

Mechanical properties and microstructure characterisation of Au-Pt dental alloy

R. Rudolf ; Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia
T. Zupančič Hartner ; Zlatarna Celje, Celje, Slovenia
L. Kosec ; Faculty of Natural Sciences and Engineering, University of Ljubljana, Ljubljana, Slovenia
A. Todorović ; Faculty of Stomatology University of Belgrade, Belgrade, Serbia
B. Kosec ; Faculty of Natural Sciences and Engineering, University of Ljubljana, Ljubljana, Slovenia
I. Anžel ; Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia

Abstract

Development of a dental alloy with high Au content is based on the ternary system of Au-Pt-Zn with a nominal composition of 86,9Au-9,9Pt-1,5Zn, and about 1,5 wt.% micro-alloying elements (In, Ir, Rh). The results analyses of different heat-treated states showed that the optimal mechanical properties and hardness of an Au-Pt-Zn alloy can be reached with combinations of heat treatment for 20 minutes at 723 K and then slowly cooling, if the alloy was annealed at 1223 K for 30 minutes and the water quenched. Research results confirmed that the microstructure of the Au-Pt-Zn alloy consists of two phases: _1-phase rich in Au (main phase) and _2-phase rich in Pt (minor phase). During XRD analysis and use of the Rietveld method, it was found that the _1-phase content is about 98,5 wt.% while the content of _2-phase is 1,5 wt.%. STA analyses show that the Au-Pt-Zn alloy has a solidus temperature of about 1292 K and a liquidus temperature of about 1412 K.

Keywords

Au dental alloy; characterisation; microstructure; properties

Hrčak ID:

26040

URI

https://hrcak.srce.hr/26040

Publication date:

1.10.2008.

Article data in other languages: croatian

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