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Microthermogravimetric studies of the kinetics and thermodynamics of heterogeneous reactions in sulfur-containing atmospheres

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Abstract

A thermobalance for studies of the high-temperature sulfidation of metals and alloys is described. This apparatus permits the determination of mass changes in the sulfidized sample as functions of temperature and sulfur vapour pressure with an accuracy of 10−6 g. Besides heterogeneous kinetics measurements, it has been shown that the chemical diffusion coefficients and deviations from stoichiometry of metal sulfides can also be studied as functions of temperature and sulfur pressure by means of equilibration measurements.

Zusammenfassung

Es wird eine Thermowaage zur Untersuchung der Hochtemperatur-Sulfidierung von Metallen und Legierungen beschrieben. Diese Apparatur ermöglicht die Bestimmung von MassenverÄnderungen der sulfidierten Proben in AbhÄngigkeit von der Temperatur und dem Schwefeldampfdruck mit einer Genauigkeit von 10−6 g. Es wird gezeigt, da\ damit, sofern Gleichgewichtsmessungen ausgeführt werden, auch die chemischen Diffusionskoeffizienten und Abweichungen der Metallsulfide von der Stöchiometrie in AbhÄngigkeit von der Temperatur und dem Schwefeldampfdruck untersucht werden können.

РЕжУМЕ

ОпИсАНы тЕРМОВЕсы Дл ь ИжУЧЕНИь ВысОкОтЕМпЕРАтУРНО гО сУльФИДИРОВАНИь МЕтАллОВ И сплАВОВ. Ап пАРАтУРА пОжВОльЕт О пРЕДЕльть ИжМЕНЕНИЕ ВЕсА сУльФ ИДИРУЕМОгО ОБРАжцА В жАВИсИМОст И От тЕМпЕРАтУРы И ДАВ лЕНИь пАРОВ сЕРы с тОЧНОстьУ 10−6 г. п ОкАжАНО, ЧтО, жА ИсклУЧЕНИЕМ гЕ тЕРОгЕННых кИНЕтИЧЕ скИх ИжМЕРЕНИИ, кОЁФФИцИЕ Нты хИМИЧЕскОИ ДИФФУжИИ И ОтклОНЕНИ ь От стЕхИОМЕтРИИ сУл ьФИДОВ МЕтАллОВ МОгУт Быть т АкжЕ ИжУЧЕНы В жАВИсИМОстИ От тЕМп ЕРАтУРы И ДАВлЕНИь сЕ Ры с пОМОЩьУ РАВНОВЕсНых ИжМЕРЕН ИИ.

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Danielewski, M., Mrowec, S. Microthermogravimetric studies of the kinetics and thermodynamics of heterogeneous reactions in sulfur-containing atmospheres. Journal of Thermal Analysis 29, 1025–1032 (1984). https://doi.org/10.1007/BF02188855

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  • DOI: https://doi.org/10.1007/BF02188855

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