Methodology of Corrosion Testing of Nuclear and Fusion Reactors Materials Using TGA/DSC and MS Complex Techniques

Ponkratov, Yu.V.; Bochkov, Vadim; Samarkhanov, Kuanysh; Karambayeva, Indira; Askerbekov, Saulet

doi:10.18321/ectj787

Cited by 14 publications

(2 citation statements)

References 11 publications

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“…Preliminarily, using calculation methods, the ratios of the amount of lithium and tin necessary for the manufacture of the tin-lithium alloy with the specified parameters were determined. After the calculations, weighed portions of these metals were loaded into the experimental device, and prototypes were manufactured in accordance with the previously developed technological procedures [15]. In total, three types of prototypes of a tin-lithium alloy with different contents of lithium atoms (20,25, and 27 at.…”

Section: Experimental Partmentioning

confidence: 99%

Determination of thermophysical properties of prototypes of tin-lithium alloy by differential scanning calorimetry

Bochkov

Ponkratov

Nikitenkov

et al. 2022

J. Phys.: Conf. Ser.

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This paper presents a description of research works to determine the thermophysical properties of a tin-lithium alloy with a different percentage of lithium and tin atoms in the alloy. The method of differential scanning calorimetry (DSC) was used for the studies, by which the thermophysical properties of the alloy (temperature of phase transition and enthalpy) were determined. The work was carried out at the TiGrA experimental complex. Studies to determine the enthalpy and temperature of phase transition of prototypes of tin-lithium alloy were carried out in the temperature range from 150°C to 500°C at a heating rate of 10°C/min. The experiments were carried out with a pristine sample of tin (reference) and prototypes of a tin-lithium alloy, the percentage of lithium in which was 20, 25 and 27 at. %. As a result of the work performed, the melting point of the prototypes was determined, which was 224°C and 218°C. The values of the specific heat of fusion (enthalpy) of the investigated alloys were determined, which amounted to 76.5 J/g, 80.7 J/g and 86.3 J/g, respectively.

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Section: Experimental Partmentioning

confidence: 99%

Determination of thermophysical properties of prototypes of tin-lithium alloy by differential scanning calorimetry

Bochkov

Ponkratov

Nikitenkov

et al. 2022

J. Phys.: Conf. Ser.

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“…На сегодняшний день на установке ТиГрА были проведены исследования по определению теплофизических характеристик (теплоемкости, температуры плавления, теплоты фазовых переходов и др.) образцов оловянно-литиевой эвтектики различного состава [11][12][13][14]. Также исследовалась высокотемпературная коррозия графита марки IG-110, используемого в реакторных установках [15].…”

Section: Introductionunclassified

Modeling of Temperature Fields and Gas-Dynamic Flows in the Zone of Placement of Lithium Ceramics Samples During Tga Studies

Chikhray,

Zaurbekova,

Askerbekov

2023

jour

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Modeling of thermogravimetric experiments is an essential tool for understanding the physical and chemical processes that occur during research. This approach helps improve data quality and gain a better understanding of what is going on during thermogravimetric analysis.This paper describes the procedure for modeling a TGA experiment on a Mettler Toledo TGA/DSC 3+ gravimeter, which, together with a mass spectrometer, a humidity generator, and an analytical balance, is part of the TiGRа analytical complex (NNC RK, Kurchatov, Kazakhstan). A description is given of the problem of modeling heat transfer processes in a gravimeter, the process of mass transfer of the reaction gas and reaction products in the gravimeter chamber, as well as the processes of chemical interaction of lithium ceramics with the reaction gas during TGA experiments. Helium with an admixture of oxygen and water vapor was considered as the purge gas.Calculations carried out using the developed model show that at a purge gas supply rate of 100 ml/s, the temperature gradient across the samples will be 2–2.5 ℃, and the gas velocity in the pebble bed will not exceed 0.5 mm/s. It has been established that the concentrations of CO2 carried away by the helium flow above the backfill and in the exit zone (in the sampling zone of the mass analyzer) at different temperatures can differ up to 22 times. Thus, using the developed model, it is possible to calculate the concentrations of CO2, CO, and H2 at any point of the thermogravimeter furnace directly above the test sample, inside and/or outside the pebble bed, in the area of the reaction mixture inlet and in the sampling area of the mass analyzer, etc. Also, if necessary, it is possible to determine the coefficients for recalculating concentrations in different sections of the pebble bed relative to the measured value. Using this model, it is possible to determine the parameters of chemical reactions – the initial concentration of carbon in the pebble bed, the activation energy of the reactions, and the concentration of O2 and H2O impurities in the purge helium, achieving the coincidence of the calculated and recorded curves using a mass analyzer. The developed model has a practical potential for further expansion of its analytical capabilities by refining the list of chemical reactions.

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Investigation of the interaction of liquid tin-lithium alloy with austenitic stainless steel at high temperatures

Ponkratov

Samarkhanov

Baklanov

et al. 2023

Fusion Engineering and Design

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Methodology of Corrosion Testing of Nuclear and Fusion Reactors Materials Using TGA/DSC and MS Complex Techniques

Cited by 14 publications

References 11 publications

Determination of thermophysical properties of prototypes of tin-lithium alloy by differential scanning calorimetry

Determination of thermophysical properties of prototypes of tin-lithium alloy by differential scanning calorimetry

Modeling of Temperature Fields and Gas-Dynamic Flows in the Zone of Placement of Lithium Ceramics Samples During Tga Studies

Investigation of the interaction of liquid tin-lithium alloy with austenitic stainless steel at high temperatures

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