Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys
| العنوان: | Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys |
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| المؤلفون: | Mathias C. Galetz, Anke S. Ulrich, Uwe Glatzel |
| المصدر: | Oxidation of Metals. 95:445-465 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Kinetics, Metals and Alloys, Oxide, Thermodynamics, Classification of discontinuities, Measure (mathematics), Isothermal process, Inorganic Chemistry, Base (group theory), chemistry.chemical_compound, Reaction rate constant, chemistry, Materials Chemistry, Constant (mathematics) |
| الوصف: | Some alloys such as many Cr-based systems show mass gain discontinuities during thermogravimetric measurements which strongly affect the oxidation kinetics. The behaviour cannot be described by the current models available in the literature. Thus, a novel $$k_\mathrm{para}$$ k para –$$k_\mathrm{lin}$$ k lin -P-model was developed to describe oxidation kinetics during the isothermal exposure of materials which show such behaviour. Beside the parabolic rate constant $$k_\mathrm{para}$$ k para and the linear mass loss constant $$k_\mathrm{lin}$$ k lin , the P-value and $$f_P$$ f P are introduced to take into account spontaneous rapid mass gains due to local oxide scale failure. The parameter P serves as a measure for the mass gain due to discontinuous events and $$f_P$$ f P is the frequency of such events. The both parameters can be related to oxide scale detachment and growth stresses. The application of the model is demonstrated for the oxidation of Cr–Si-based alloys in synthetic air at $$1200^{\circ }\hbox {C}$$ 1200 ∘ C for 100 h. For these alloys, the origin of the mass gain discontinuities is discussed and the meaning of P and $$f_P$$ f P is explained in more detail. Using this newly developed model, an insight into growth and nitridation resistance of oxide scales as well as scale adhesion is gained. |
| تدمد: | 1573-4889 0030-770X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::c2851b7f74100b89853422010d006606 https://doi.org/10.1007/s11085-021-10029-8 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........c2851b7f74100b89853422010d006606 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 15734889 0030770X |
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