Gęstość i napięcie powierzchniowe ciekłych stopów Cu-Pb

• Autorzy: Łabaj J. , Sikora B. , Fornalczyk A.

Warianty tytułu

EN

Density and surface tension of liquid alloys Cu-Pb

• Języki publikacji: PL

Abstrakty

PL

Przestawiono wyniki badań gęstości i napięcia powierzchniowego ciekłych stopów Cu-Pb o zawartości ołowiu 1 i 5% mas. Badania prowadzono z wykorzystaniem metody opartej na prawie Archimedesa w zakresie temperatur 1433 ÷ 1493 K. Na podstawie uzyskanych wyników pomiarów oszacowano gęstość, której wartość dla stopu o zawartości 1 % Pb, w stosowanym zakresie temperatur, zmienia się od 8,04 do 7,25 g • cm-3 i napięcie powierzchniowe, którego wartość zmienia się od 1,02 do 0,94 N •m-1. Odpowiednio dla badanego stopu o zawartości 5 % Pb, gęstość zmienia się od 8,24 do 7,90 g • cm-3, a napięcie powierzchniowe od 0,91 do 0,76 N • m-1.

EN

The surface phenomena are playing significant role in metallurgical processes. Determination of a basic parameter like a surface tension, for liquid slag and liquid metals is encountering the difficulties caused by necessity of making tests at high temperatures, aggressiveness of tested liquids to majority of materials and the necessity for application of protective atmosphere. Similar problems are encountered in case of density measurements.One of most often applied methods for measurement of metal surface tension is the method of deposited drop. In this method it is necessary to perform a number of complex technical measurements and calculations. A more simple in application is the method based on Archimedes' principle. This method is very simple and because of that is useful in case of liquids at high temperatures, thus for liquid metals and liquid slag. One of most serious problems in this case is selection of material for the float with suspension and for crucible. In the scope of this work were executed the measurements of density and surface tension of liquid copper-lead alloys with lead content of 1 and 5 %. The main component of equipment used in research was analytical balance together with movable pipe furnace, which could be precise shifted along the vertical axis together with sample. For examinations was adopted a float of ceramic material. To minimize a possibility of oxidation of metal surface, the argon was introduced into the system. Measurements were executed in the range of temperatures from 1433 to 1493 K. Depending on temperature and chemical composition for a copper alloy with 1 % of lead, the density was varying from 8.04 to 7.25 g • cm3, while the surface tension from 1.02 to 0.94 N • m- 1. In case of copper alloy with lead content at 5 % were obtained the densities at similar level as that of first alloy. Values of surface tension for the alloy with 5 % Pb are lower and ranging from 0.91 to 0.76N • m-1. The applied method based on Archimedes' principle in spite of its simplicity is requiring however, a very precise measurement of wetting angle. The materials used in experiment were characterizing with Iow mutual wettability.

Słowa kluczowe

PL

stopy miedzi; gęstość; napięcie powierzchniowe

EN

copper alloys; density; surface tension

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Rudy i Metale Nieżelazne
• Rocznik: 2005
• Tom: R. 50, nr 4
• Strony: 164--168
• Opis fizyczny: Bibliogr. 6 poz., tab.

Twórcy

autor

Łabaj J.

• Politechnika Śląska, Katowice

autor

Sikora B.

• Politechnika Śląska, Katowice

autor

Fornalczyk A.

• Politechnika Śląska, Katowice

Bibliografia

• 1. Staronka A., Piekarska M.: Archiwum Hutnictwa, 1982, t. 27, z. 1-2, s. 31-48.
• 2. Lukas L. D.: Opracowanie IRSID 1975 [niepubl.].
• 3. Keene R.: Inter. Mat. Rev. 1993, v. 38, nr 4.
• 4. Adamson A. W.: Chemia fizyczna powierzchni. PWN W-wa 1963.
• 5. Siwiec G., Botor J.: Rudy Metale R. 49, 2004, nr 4, s. 172-177.
• 6. Siwiec G., Botor J.: Archives of Metallurgy and Materials, 2004, t. 49, nr 3, s. 611-5-621.