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- W3157042227 abstract "Abstract 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 $$k_mathrm{para}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>k</mml:mi> <mml:mi>para</mml:mi> </mml:msub> </mml:math> – $$k_mathrm{lin}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>k</mml:mi> <mml:mi>lin</mml:mi> </mml:msub> </mml:math> - P -model was developed to describe oxidation kinetics during the isothermal exposure of materials which show such behaviour. Beside the parabolic rate constant $$k_mathrm{para}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>k</mml:mi> <mml:mi>para</mml:mi> </mml:msub> </mml:math> and the linear mass loss constant $$k_mathrm{lin}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>k</mml:mi> <mml:mi>lin</mml:mi> </mml:msub> </mml:math> , the P -value and $$f_P$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>f</mml:mi> <mml:mi>P</mml:mi> </mml:msub> </mml:math> 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 $$f_P$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>f</mml:mi> <mml:mi>P</mml:mi> </mml:msub> </mml:math> 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 $$1200^{circ }hbox {C}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mn>1200</mml:mn> <mml:mo>∘</mml:mo> </mml:msup> <mml:mtext>C</mml:mtext> </mml:mrow> </mml:math> for 100 h. For these alloys, the origin of the mass gain discontinuities is discussed and the meaning of P and $$f_P$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>f</mml:mi> <mml:mi>P</mml:mi> </mml:msub> </mml:math> 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." @default.
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- W3157042227 date "2021-04-27" @default.
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- W3157042227 title "Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys" @default.
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- W3157042227 doi "https://doi.org/10.1007/s11085-021-10029-8" @default.
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