Abstract
Kinetic studies in metallurgy involve the measurement of changes in suitable properties of systems undergoing transformation under controlled conditions. Often, such measurements are relatively easy, and it is, therefore, not difficult to generate a mass of kinetic data. Thereafter, the data are routinely processed for the fitting of kinetic models and the evaluation of kinetic parameters for identification of a ‘reaction mechanism’. Unfortunately, the apparent simplicity of measurements and mathematical procedure, and even reproducibility, can be rather misleading, because there can be uncertainties at every stage and the conclusions can be erroneous. The present article discusses the sources of some of the uncertainties and their implications.
Zusammenfassung
Kinetische Untersuchungen in der Metallurgie schließen Messungen von Veränderungen geeigneter Parameter an Systemen ein, wobei diese unter kontrollierten Bedingungen bestimmte Umwandlungen eingehen. Solche Messungen sind oft sehr einfach und es ist nicht allzu schwer, eine große Menge von Versuchsdaten zu bekommen. Anschließend werden die Daten völlig routinemäßig an einigen kinetischen Modellen erprobt und die kinetischen Parameter ermittelt, um einen ‘Reaktionsmechanismus’ zu entwickeln. Unglücklicherweise kann die scheinbare Einfachheit der Messungen, der mathematischen Verarbeitung der Daten, ja selbst die Reproduzierbarkeit zu Mißschlüssen führen, da jeder Schritt mit Unsicherheiten behaftet sein kann und sich somit ein fehlerhafter Schluß ergeben kann. Vorliegende Arbeit beschäftigt sich mit dem Ursprung solcher Unsicherheiten und ihren Folgen.
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References
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Ray, H.S. Some factors that lead to uncertainties in kinetic studies in metallurgy. Journal of Thermal Analysis 36, 743–764 (1990). https://doi.org/10.1007/BF01914525
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DOI: https://doi.org/10.1007/BF01914525