Dependences of Co—Si Melt Viscosity on Temperature and Concentration

Bel’tyukov, A. L.; Olyanina, N. V.; Lad’yanov, V. I.

doi:10.1134/s0018151x18060068

Cited by 9 publications

(7 citation statements)

References 25 publications

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“…To estimate the errors in measuring viscosity, the method described in [27], was used. It was established that the relative error of the obtained kinematic viscosity values does not exceed 4%, with an error in a single experiment of 2%.…”

Section: Methodsmentioning

confidence: 99%

Viscosity of Cobalt Melt: Experiment, Simulation, and Theory

et al. 2018

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The results of experimental measurements, molecular dynamics simulation, and theoretical calculations of the viscosity of a cobalt melt in a temperature range of 1400 − 2000 K at a pressure p = 1.5 bar corresponding to an overcooled melt at temperatures of 1400 − 1768 K and an equilibrium melt with temperatures from the range 1768 − 2000 K are presented. Theoretical expressions for the spectral density of the time-dependent correlation function of the stress tensorS(ω) and kinematic viscosity ν determined from the frequency and thermodynamic parameters of the system are obtained. The temperature dependences of the kinematic viscosity for the cobalt melt are determined experimentally by the torsional oscillation method; numerically, based on molecular simulation data with the EAM potential via subsequent analysis of the time correlation functions of the transverse current in the framework of generalized hydrodynamics; and by the integral Kubo-Green relation;they were also determined theoretically with the Zwanzig-Mori memory functions formalism using a self-consistent approach. Good agreement was found between the results of theoretical calculations for the temperature dependence of the kinematic viscosity of the cobalt melt using experimental data and the molecular dynamics simulation results. From an analysis of the temperature dependence of the viscosity, we obtain an activation energy of E = (5.38 ± 0.02) × 10 −20 J.

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Section: Methodsmentioning

confidence: 99%

Viscosity of Cobalt Melt: Experiment, Simulation, and Theory

et al. 2018

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“…Thus, the viscosity isotherm of Ir-Si melts was calculated by MH (Figure 7b; curve 1) and compared to the corresponding datasets of liquid Co-Si alloys. Indeed, combining the thermodynamic data of the Si-Co liquid phase [66] with the viscosity reference data of liquid Si [62] and Co [55,67], the viscosity isotherm was calculated for T = 1673 K and compared with experimental data [68] obtained at the same temperature (Figure 7b; curve 2). The two viscosity isotherms are similar and exhibit the same trend with the experimental data [68] as shown in Figure 7b.…”

Section: Viscositymentioning

confidence: 99%

“…Indeed, combining the thermodynamic data of the Si-Co liquid phase [66] with the viscosity reference data of liquid Si [62] and Co [55,67], the viscosity isotherm was calculated for T = 1673 K and compared with experimental data [68] obtained at the same temperature (Figure 7b; curve 2). The two viscosity isotherms are similar and exhibit the same trend with the experimental data [68] as shown in Figure 7b. Therefore, based on the above-mentioned data, one may determine that the Moelwyn-Hughes isotherm (Figure 7a; curve 1) better describes the viscosity of liquid Ir-Si alloy.…”

Section: Viscositymentioning

confidence: 99%

Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

2021

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The design of processing routes involving the presence of the liquid phase is mainly associated with the knowledge of its surface and transport properties. Despite this need, due to experimental difficulties related to high temperature measurements of metallic melts, for many alloy systems neither thermodynamic nor thermophysical properties data are available. A good example of a system lacking these datasets is the Ir-Si system, although over the last fifty years, the structures and properties of its solid phases have been widely investigated. To compensate the missing data, the Gibbs free energy of mixing of the Ir-Si liquid phase was calculated combining the model predicted values for the enthalpy and entropy of mixing using Miedema’s model and the free volume theory, respectively. Subsequently, in the framework of statistical mechanics and thermodynamics, the surface properties were calculated using the quasi-chemical approximation (QCA) for the regular solution, while to obtain the viscosity, the Moelwyn-Hughes (MH) and Terzieff models were applied. Subsequently, the predicted values of the abovementioned thermophysical properties were used to model the non-reactive infiltration isotherm of Ir-Si (eutectic)/SiC system.

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“…Indeed, combining the thermodynamic data of the Si-Co liquid phase [66] with the viscosity reference data of liquid Si [62] and Co [55,67], the viscosity isotherm was calculated for T=1673 K and compared with experimental data [68] obtained at the same temperature (Figure 7b; curve 2). The two viscosity isotherms are similar and exhibit the same trend with the experimental data [68] as shown in Figure 7b. Therefore, based on the abovementioned, one may figure out that the Moelwyn-Hughes isotherm (Figure 7a; curve 1) describes better the viscosity of liquid Ir-Si alloy.…”

Section: Viscositymentioning

confidence: 99%

Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

Novaković¹,

Delsante²,

Giuranno³

2021

Preprint

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The design of processing routes involving the presence of the liquid phase is mainly associated with the knowledge of its surface and transport properties. Despite this need, due to experimental difficulties related to high temperature measurements of metallic melts, for many alloy systems neither thermodynamic nor thermophysical properties data are available. A good example lacking these datasets represents the Ir-Si system, although over the last fifty years, the structures and properties of its solid phases have been widely investigated. To compensate the missing data, the Gibbs free energy of mixing of the Ir-Si liquid phase was calculated combining the model predicted values for the enthalpy and entropy of mixing using Miedema’s model and Free Volume Theory, respectively. Subsequently, in the framework of statistical mechanics and thermodynamics, the surface properties were calculated using the Quasi Chemical Approximation (QCA) for the regular solution, while to obtain the viscosity, the Moelwyn-Hughes (MH) and Terzieff models were applied. Subsequently, the predicted values of the abovementioned thermophysical properties were used to model the non-reactive infiltration isotherm of Ir-Si (eutectic) / SiC system.

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Dependences of Co—Si Melt Viscosity on Temperature and Concentration

Cited by 9 publications

References 25 publications

Viscosity of Cobalt Melt: Experiment, Simulation, and Theory

Viscosity of Cobalt Melt: Experiment, Simulation, and Theory

Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

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