THERMODYNAMICS OF OXYGEN SOLUTIONS IN THE Fe – Ni, Fe – Co AND Ni – Co MELTS

Дашевский, В. Я.; Александров, А. А.; Леонтьев, Л. И.

doi:10.17073/0368-0797-2015-1-54-60

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…Для реакции (1) энергия Гиббса рассчитана по урав-нению где k - мольная доля FeO, а (1 - k) - мольная доля CoO в оксидной фазе над расплавами системы Fe - Co [6].…”

Section: Doi: 1017073/0368-0797-2017-3-230-240unclassified

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

Александров¹,

Дашевский²,

Leont’ev³

2017

Izv. vysš. učebn. zaved., Čern. metall.

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Section: Doi: 1017073/0368-0797-2017-3-230-240unclassified

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

Александров¹,

Дашевский²,

Leont’ev³

2017

Izv. vysš. učebn. zaved., Čern. metall.

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“…Величины данных параметров взаимодействия для никель-кобальтовых расплавов различного состава (см. таблицу) рассчитаны по уравнению [21] С учетом приведенных в таблице значений констант равновесия и параметров взаимодействия уравнения (13) и (14) примут вид: Содержание алюминия в точках минимума незначительно снижается от никеля к кобальту, как и в случае расплавов системы Ni -Co -Al [6]. Дальнейшие присадки алюминия приводят к возрастанию концентрации кислорода.…”

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Оxygen solubility in melts of Ni – Co system at complex deoxidation by aluminium and silicon

Alexandrov

Dashevskii

Леонтьев

2019

Izv. vysš. učebn. zaved., Čern. metall.

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Alloys of Ni – Co system are widely used in industry. Oxygen is one of the harmful impurities in these alloys; in metal it is present in dissolved form or in the form of nonmetallic inclusions. Getting the finished metal with a minimum oxygen concentration is one of the main tasks of production process of these alloys. With the complex deoxidation of the metal melt, the activity of oxides resulting from the deoxidation process is less than one, due to this, with the same content of deoxidizing elements, it is possible to obtain a metal with a lower oxygen concentration, therefore, more deeply deoxidized. At joint deoxidation with two deoxidizers, a stronger deoxidizer takes a predominant part in the reaction, however, if oxides of the deoxidizing elements form chemical compounds, it contributes to participation of a weaker deoxidizer in deoxidation process. A thermodynamic analysis of the joint influence of aluminum and silicon on the solubility of oxygen in the melts of Ni – Co system has been performed. Deoxidation reaction products may be formed as mullite (3Al2O3·2SiO2 ), and kyanite (Al2O3·SiO2 ). Presence of silicon in the melt enhances the deoxidizing ability of aluminum: insignificantly in the case of formation of compound 3Al2O3·2SiO2 and significantly in the case of formation of compound Al2O3·SiO2 . Oxygen solubility curves in the case of formation of compound Al2O3·SiO2 pass through a minimum, the position of which depends on the content of aluminum in the melt and doesn’t dependent on silicon content. Aluminum content in the minimum points is insignificantly reduced from nickel to cobalt as in the case of melts of Ni – Co–Al. Further additives of aluminum lead to an increase in oxygen concentration. Areas of compounds Al2O3 , 3Al2O3·2SiO2 , Al2O3·SiO2 and SiO2 depending on aluminum and silicon contents in the melt are determined. In melts of the Ni – Co system, the deoxidizing ability of aluminum and silicon increases with an increase in cobalt content in the melt. However, silicon enhances the deoxidizing ability of aluminum the weaker the higher cobalt content.

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“…Значения констант равновесия реакции раскисления хромом и кремнием никель-кобальтовых сплавов, содержащих 10, 15 и 20 % Co, а также значения параметров взаимодействия, характеризующие растворы кислорода в этих расплавах, приведены в таблице. Данные для сплавов Ni - 10 % Co, Ni - 15 % Co и Ni -20 % Co рассчитаны по методике, описанной в работе [15].…”

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EFFECT OF SILICON ON THE OXYGEN SOLUBILITY IN Ni – Co – Cr MELTS

Александров

Дашевский

2019

Izv. vysš. učebn. zaved., Čern. metall.

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Thermodynamic analysis of the effect of silicon on the solubility of oxygen in Ni – Co – Cr melts has been carried out at 1873 K. Silicon at low contents practically does not affect the concentration of oxygen in Ni – Co – Cr melts, which is determined by the chromium content. With a higher content of silicon after changing the interaction mechanism of chromium and silicon with oxygen, when silicon already determines the solubility of oxygen in the melt, the oxygen concentration decreases. However, the deoxidizing ability of silicon at elevated contents in Ni – Co – Cr melts is much lower than in Ni – Co melts.

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THERMODYNAMICS OF OXYGEN SOLUTIONS IN THE Fe – Ni, Fe – Co AND Ni – Co MELTS

Cited by 9 publications

References 1 publication

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

Оxygen solubility in melts of Ni – Co system at complex deoxidation by aluminium and silicon

EFFECT OF SILICON ON THE OXYGEN SOLUBILITY IN Ni – Co – Cr MELTS

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