Mechanism of distortion of precious alloy restoration at high temperatures (Part 2). Effect of addition of Fe, In and Sn on the deflection at high temperatures.

Abstract

Iron, indium and/or tin were added to two mother alloys, 90Au-10Pd and 80Au-20Pt, and 10 kinds of alloys were prepared from each mother alloy. The total amount of the additional elements was 0.75wt%. The deflection at high temperatures (the final deflection after the specimen was heated until 1050°C) and the deflection-beginning temperature (the temperature at which 20μm deflection occurred) were measured, and the effect of the additional elements on these two properties was examined.The deflection decreased by addition of Fe, In and/or Sn in both alloy system. The deflection-beginning temperature increased by addition of the elements. These results showed that the mechanical properties at high temperatures were improved by addition of Fe, In and/or Sn. The deflection at high temperatures and the deflection-beginning temperature were negatively correlated. Indium appears to increase the deflection in both alloy systems.