Dichtemessungen bei hohen Temperaturen Über die Dichte des flüssigen Goldes und flüssiger Gold‐Kupfer‐ und Silber–Kupferlegierungen

Abstract

Die spezifischen Volumina von Gold‐ und Gold‐Kupferlegierungen wurden bei höheren Temperaturen im flüssigen und festen Zustande bestimmt, ebenso die spezifischen Volumina der Silber‐Kupferlegierungen im flüssigen Zustande. Die spezifischen Volumina hängen von der Temperatur und der Konzentration der Legierungen sehr nahe linear ab.

Density and Thermal Expansion of Liquid Ag–Cu and Ag–Au Alloys

“…6 and 7 for the two binary systems. These values are in good agreement with the literature values of Krause and Sauerwald [2] and Gebhardt and Dorner [3], which are shown in Figs. 6 and 7 as well.…”

“…Generally, there is good agreement with literature data [2,3,[10][11][12][13][14][15]. However, in the case of copper and gold, the values for ρ T given by Krause and Sauerwald [2] and Gebhardt and Dorner [3] seem to be significantly lower.…”

“…However, in the case of copper and gold, the values for ρ T given by Krause and Sauerwald [2] and Gebhardt and Dorner [3] seem to be significantly lower. This might be explained by the previously described inaccuracy in the correction of the thermal expansion of the salt melt that has been used in the applied buoyancy method.…”

“…The agreement between the calculated and measured values is reasonable, although the uncertainties for determing ρ T are generally larger than for the determination of ρ L . In particular, the uncertainty of ρ T is increased for Ag -80 at%Au due to its restricted visibility from the side and for Ag -75 at%Au due to the strong The values of ρ T given by Krause and Sauerwald [2] and Gebhardt and Dorner [3] are shown in Figs. 8 and 9 as well.…”

“…In 1929, Krause and Sauerwald [2] published densities of liquid Cu-Ag that were determined using a buoyancy method. Density data of liquid Ag-Au alloys, measured with the same technique, were reported by Gebhardt and Dorner [3] in 1951.…”