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71.
72.
The temperature variations of the density of liquid magnesium-lead alloys were measured by the gamma-method in the temperature
range from the liquidus temperature to 950–1000 K for compositions of 19.11, 33.45, 52.46, and 83.06 at. % Pb. It is shown
that within the estimated errors (0.25–0.30 %), the alloy density depends linearly on the temperature. Approximation dependences
ρ(T) were obtained for every studied composition together with generalizing density-temperature and density-concentration dependences
for the range of 0–100 at. % Pb.
The work was financially supported by the Russian Foundation for Basic Research (Grant No. 06-08-00040). 相似文献
73.
Thermal conductivity of refrigerant R-409A in vapor phase was studied in the range of temperatures 306–425 K and pressures
0.12–1.33 MPa. Measurements were performed with the stationary method of coaxial cylinders. Uncertainty of experimental data
on thermal conductivity was 1.5–2.5 %, and errors of temperature and pressure measurements did not exceed 0.05 K and 4 kPa,
respectively. Approximating dependence of thermal conductivity on pressure and temperature was obtained. Thermal conductivity
on dew line and in ideal gas state was calculated. 相似文献
74.
V. M. Sklyarchuk Yu. A. Plevachuk A. S. Yakimovich I. I. Shtablavy S. V. Stankus R. A. Khairulin 《Thermophysics and Aeromechanics》2011,18(1):123-128
Structure, interdiffusion, and dynamic viscosity of eutectic Sn-Pb melt have been experimentally investigated in a wide temperature range. On the basis of the obtained data on the position and form of the first maximum of the structure factor in the framework of the hard sphere model, values of sphere packing index and sphere diameter have been determined for the melt at 470 and 570 K. Correlations resulting from the model of hard spheres served to calculate coefficients of dynamic viscosity and interdiffusion of liquid alloy. Besides, temperature dependence of dynamic viscosity has been calculated with the use of thermodynamic approximation of Kozlov — Romanov — Petrov. Calculated values of the properties have been compared with experimental data. 相似文献
75.
R. A. Khairulin S. V. Stankus R. N. Abdullaev Yu. A. Plevachuk K. Yu. Shunyaev 《Thermophysics and Aeromechanics》2010,17(3):391-396
Temperature dependences of the density of liquid silver-tin melts containing 61.6 and 96.5 wt. % Sn (59.3 and 96.15 at. %
Sn) have been determined using gamma-ray attenuation technique over the temperature range from liquidus line to 950 K. The
density changes during solid-liquid transition have been directly measured for the first time for eutectic alloy (96.5 wt.
% Sn). The temperature and concentration dependences of the thermal properties for Ag-Sn system have been constructed. Kinetics
of homogenization of the melts with mean composition of 61.6 wt. % Sn has been investigated in the temperature range from
770 to 950 K. The coefficients of binary diffusion have been derived from these experiments. 相似文献
76.
A. V. Sotnikov V. V. Bakovets A. Sh. Agazhanov S. V. Stankus D. P. Pishchur V. V. Sokolov 《Physics of the Solid State》2018,60(3):487-493
The temperature dependences of the heat capacity (C p ) and the thermal conductivity (κ) in the temperature range from 300 to 773 K of polycrystalline gadolinium sulfide samples (γ-GdS y ) with the deviation of the composition from the integer stoichiometric were studied. It was found that the thermal conductivity of gadolinium sulfides decreases monotonically and reaches 0.74 W/(m K) at T = 773 K for the composition y = 1.479, which is much lower than for the known single-crystal samples. The influence of morphological defects (boundaries of crystallites and dislocations) on the intensity of scattering of phonons is studied. It has been established that ceramic samples of gadolinium sulphides have a large heat capacity and a lower thermal conductivity, in comparison with monocrystalline samples of the same composition. 相似文献