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Influence of Zinc on the Surface Tension, Density and Molar Volume of (Ag-Sn)eut +Zn Liquid Alloys

Gąsior W., Pstruś J., Moser Z.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 1

361--368

The dilatometric and maximum bubble pressure methods were applied for the measurements of the density and surface tension of liquid (Ag-Sn)eut +Zn lead-free solders. The experiments were carried out in the temperature range from 515 to 1223 K for the alloys of the zinc concentration equaling 0.01, 0.02, 0.04, 0.05, 0.1 and 0.2 of the mole fraction. It was found that the temperature dependence of both the density and the surface tension could be thought as linear, so they were interpreted by straight line equations. The experimental data of the molar volume of the investigated alloys were described by the polynomial dependent on the composition and temperature. Calculations of the surface tension by Butler’s equation were conducted and confronted with the experimental data. Some significant deviations between the experimental and the calculated surface tension were observed. They reached almost 40 mNm-1. The observed changes of the density and surface tension caused by the zinc addition to the Ag-Sn eutectic were discussed with the consideration of the thermodynamic properties and the influence of a small quantity of impurities in a protective gas atmosphere.

Density and molar volume of Al-Li-Mg solid alloys

Gąsior W., Moser Z., Pstruś J.

Archives of Metallurgy

2003

Vol. 48, iss. 4

497-505

Using the dilatometric method the densities of the solid Al-Li-Mg alloys were measured for two constant values of t=0.85 and 0.95 and for li concentrations changing from 0 to 0.25 mole fraction. The experiments were carried out in the temperature ranges: 293-818K and 293-718K for t=0.05 and 0.15, respectively. The temerature dependences of density were described by the parabolic equation of the form y=a+bT+cT2. The parameters a, b and c were calculated using the least squares method. It was found that the density isoterms for t=0.95 show slight nagative from the linear behaviour, while for t=0.85 an almost linear change is observed when plotting the density from Al-Mg alloys to pure Li density. The molar volume isotherms of Al-Li-Mg solid alloys calculated at the same temperatures as for the density are characterised by slow decreasing with the increase of Li content, except that calculated at 700K for t=0.85 showing an opposite trend.

Stosując metodę dylatometryczną zmierzono gęstość stopów Al-Li-Mg dla stopów charakteryzujących się stałym stosunkiem aluminium do magnezu wynoszącym 0.95 oraz 0.85. Pomiary prowadzono dla stopów, w których stężenie litu zmieniało się od 0 do 0.25 ułamka molowego oraz w zakresie temperatur od 293-818K dla t=0.95 oraz od 293-718 dla t=0.85. Zmiany gęstości z temeraturą zostały opisane zależnościami parabolicznymi postaci y=a+bT+cT2 a parametry a, b i c zostały wyliczone metodą najmniejszych kwadratów. Obliczone izotermy gęstości w 293K oraz 800K dla t=0.95 oraz w 293K dla t=0.85 charakteryzują się słabym ujemnym odstępstwem od zmiany liniowej między gęstością stopu dwuskładnikowego Al-Mg i gęstością Li.Natomiast, wyznaczone w tych samych temperaturach izotermy objętości molowej pokazują nieznaczny spadek z zawartościa litu z wyjatkiem izotermy dla T=700K oraz t=0.85, która charakteryzuje się bardzo słabą wzrostową tendencją.