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  • 1. Brooks, R. F.
    et al.
    Egry, I.
    Seetharaman, Seshadri
    KTH, Superseded Departments, Materials Science and Engineering.
    Grant, D.
    Reliable data for high-temperature viscosity and surface tension: results from a European project2001In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 33, no 6, p. 631-637Article in journal (Refereed)
    Abstract [en]

    Results are reported of work carried out for the European Commission under contract number MAT1 CT 940006, between 1994 and 1998. The project provided recommended surface tension - temperature relationships for copper and nickel samples prepared by cold crucible melting to +/-3%, by the levitation and sessile drop methods, and values were also obtained for iron and gold in preliminary studies. For copper, (gamma /N m(-1)) = 1.304 - 0.289 x 10(-3)[(theta - 1083)/degreesC]; for nickel, (gamma /N m(-1)) = 1.781 - 0.285 x 10(-3)[(theta - 1455)/degreesC]. Comparison of terrestrial measurements with those made in microgravity have shown that the Cumming's equation is a reliable and satisfactory method of correcting the surface tensions derived with the levitated drop method for the effect of electromagnetic pressure. For measurements with an oscillating cylinder viscometer, recommended viscosity-temperature relationships are given for copper, nickel, and iron. For copper, log(10)(eta /mPa s) = -0.2791 + [1245.5/(T/K)]; for nickel, log(10)(q/mPa s) = -0.5038 + [2029/(T/K)]; and for iron, log(10)(eta /mPa s) = -0.6494 + [2568/(T/K)].

  • 2. Egry, I.
    et al.
    Brooks, R.
    Holland-Moritz, D.
    Novakovic, R.
    Matsushita, Taishi
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Plevachuk, Y.
    Ricci, E.
    Seetharaman, Seshadri
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Sklyarchuk, V.
    Wunderlich, R.
    Thermophysical properties of liquid Al-Ni alloys2009In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 38, no 4, p. 343-351Article in journal (Refereed)
    Abstract [en]

    Within the Integrated Project IMPRESS, funded by the EU, thermophysi cal properties of two Al-Ni alloys have been investigated: Raney-nickel (Al-31.5at%Ni) and Al-25at%Ni, corresponding to the intermetallic phase Al3Ni. Transition temperatures, latent heat, heat capacity, density and electrical resistivity were measured in the solid and liquid phases. In addition, surface tension and viscosity of the melts were also determined. All quantities have been obtained as a function of temperature, in some cases also in the undercooled liquid. In this paper, we report on results obtained for the liquid phase using advanced container-based and containerless measurement methods. The obtained data yield a comprehensive characterisation of this technologically relevant class of alloys.

  • 3.
    Ekbom, Lars B
    et al.
    KTH, Superseded Departments, Materials Science and Engineering.
    Eliasson, Anders
    KTH, Superseded Departments, Materials Science and Engineering.
    Fredriksson, Hasse
    KTH, Superseded Departments, Materials Science and Engineering.
    Liquid-phase Sintering of Tungsten Composites in Space. Agglomerate Separation and Particle Growth1989In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 21, p. 507-514Article in journal (Refereed)
  • 4.
    Grishchenko, Dmitry
    et al.
    CEA, DEN, STRI, LMA, F-13108 Saint-Paul-Lez-Durance, France.
    Piluso, Pascal
    CEA, DEN, STRI, LMA, F-13108 Saint-Paul-Lez-Durance, Franc.
    Recent progress in the gas-film levitation as a method for thermophysical properties measurements: application to ZrO2-Al2O3system2011In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 40, no 2, p. 127-149Article in journal (Refereed)
    Abstract [en]

    The gas-film levitation is a technique commonly used for contactless processing and thermophysical properties measurements of oxide and metallic glass-forming melts at elevated temperatures (up to 1650ºC). For the first time, the method has been successfully applied for the levitation of oxide and metallic non-glass forming melts in the temperature range of 1700ºC – 2500ºC. Several subjects are discussed in the paper: (1) the applicability of the gas-film levitation for the sustentation of different materials, (2) methodology of data analysis, (3) uncertainty of thermophysical properties measurements and (4) related theoretical modeling. Finally we provide the results of thermophysical properties measurements of ZrO2 – Al2O3 melts of different compositions within the temperature interval from 1700 to 2350ºC.

  • 5. Koči, L.
    et al.
    Belonoshko, Anatoly B.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. KTH, School of Engineering Sciences (SCI), Physics.
    Ahuja, Rajeev
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Uppsala University, Sweden .
    Ab initio calculations of hcp and bcc Fe at extreme conditions2009In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 38, no 1, p. 37-42Article in journal (Refereed)
    Abstract [en]

    The determination of the Fe phase stabilities at low pressures and temperatures is fairly uncontroversial from experiments and theoretical calculations. However, at extreme conditions, it is still a polemic subject. In this work, the properties of hexagonal close-packed and body-centered cubic Fe have been studied by means of ab initio molecular dynamics (AIMD) within the framework of density functional theory (DFT). For the hcp Fe, the calculations regarding the equation of state (EOS) agree well with both experiment and previous calculations. From stress tensor analysis, the bcc phase shows a deviation from the stability region at approximately P = 230 GPa, T = 2600 K.

  • 6. Ricci, E.
    et al.
    Battezzati, L.
    Brooks, R.
    Chapman, L. A.
    Fecht, H. J.
    Giuranno, D.
    Novakovic, R.
    Seetharaman, Seshadri
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Voss, D.
    Wunderlich, R.
    Thermophysical properties of Cu-based industrial alloys in the liquid phase2009In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 38, no 1, p. 43-61Article in journal (Refereed)
    Abstract [en]

    The thermophysical properties of Cu-based industrial alloys in the liquid phase have been determined in the framework of ThermoLab project. Four commercial copper alloys provided by one member of the industrial user group, Cu-Sn-X (X=P; Ti), Cu-Ni-Si and Cu-Ni-Si-Mg have been investigated by different European laboratories. The results of the ground-based experimental programme concerning classical high-temperature calorimetry, thermal diffusivity, density, surface tension and viscosity measurements were critically compared in order to improve the reliability of data and to identify, when possible, recommended values.

  • 7.
    Seetharaman, Seshadri
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Wang, Lijun
    A glimpse into the mystery of slags - by physicochemical measurements2013In: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 42, no 2, p. 97-114Article in journal (Refereed)
    Abstract [en]

    Measurements of the physicochemical properties of slags such as thermodynamic activities and viscosities have been very useful, not only from a process metallurgical view point, but also towards understanding of slag structure, which still remains a mystery. This paper presents some measurements of the slag properties carried out at the Royal Institute of Technology, Stockholm as well as at TU-Bergakademie, Freiberg, Germany that provide a unique insight into the structure of slags. The measurements include sulphide capacities of slags in the region between ortho- and meta- silicate compositions, which could be explained on the basis of the polymerization of silicates. Density measurements of aluminosilicate slags provide an insight into the relative bond strengths. Measurements of the chemical diffusivities have been carried out. This enables an understanding of the affinity of sulphide ions in the molten silicate. The surface velocity and viscosity measurements provide an understanding of the surface bondings between sulphur/oxygen and Fe atoms. The latest experimental technique developed jointly in Germany and Sweden provides a glimpse into the evaporation phenomena on thin slag films. The need for the application of newer experimental methods in the study of slag properties is emphasized in the present paper.

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