[Studies on Au-Ag-Pd-Cu alloys. (Part 1) Effects of Au component on some properties of alloys (author's transl)].

Au-Ag-Pd-Cu quaternary dental alloys were studied to find out the more favourable Au content. Pd and Cu content were fixed to 20 wt% respectively but Au content were changed from 10 wt% to 40 wt% and Ag content were balanced. Tensile, hardness, corrosion and castability test were carried out. Results were as follows. 1) The tensile strength and elongation of swaged specimen showed highest value at 30 wt% Au but in case of casted specimen, tensile strength was highest as 20 wt% and elongation was minimum at 30 wt% Au. Those differences between swaged and cast specimens were seemed to depend on the casting porosities. 2) The Vickers hardness test showed that the hardness gradually increased with Au content and showed the highest value at 30 wt% Au. 3) The corrosion test in the 0.1% Na2S solution indicated that the corrosion resistance was increased with Au content but the rate of increment was slow down at 30 wt% Au. 4) The castability test showed that no significant difference was found out one another. These experimental results seemed to indicate that 30 wt% Au was the favourable composition for Au-Ag-Pd-Cu dental alloys.