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Discontinuities in Oxidation Kinetics: A New Model and its Application to Cr–Si-Base Alloys
Oxidation of Metals ( IF 2.2 ) Pub Date : 2021-04-27 , DOI: 10.1007/s11085-021-10029-8
Anke S. Ulrich , Uwe Glatzel , Mathias C. Galetz

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 \(k_\mathrm{para}\)\(k_\mathrm{lin}\)-P-model was developed to describe oxidation kinetics during the isothermal exposure of materials which show such behaviour. Beside the parabolic rate constant \(k_\mathrm{para}\) and the linear mass loss constant \(k_\mathrm{lin}\), the P-value and \(f_P\) 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 \(f_P\) 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 \(1200^{\circ }\hbox {C}\) for 100 h. For these alloys, the origin of the mass gain discontinuities is discussed and the meaning of P and \(f_P\) 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.



中文翻译:

氧化动力学的不连续性:一种新模型及其在Cr-Si基合金中的应用

某些合金(例如许多Cr基系统)在热重测量期间显示质量增益不连续性,这会严重影响氧化动力学。该行为不能用文献中的当前模型来描述。因此,开发了一种新颖的\(k_ \ mathrm {para} \)\(k_ \ mathrm {lin} \) - P模型来描述等温暴露于具有这种行为的材料的过程中的氧化动力学。除了抛物线速率常数\(k_ \ mathrm {para} \)和线性质量损失常数\(k_ \ mathrm {lin} \)之外,还引入了P值和\(f_P \)来考虑自发快速由于局部氧化皮破坏而导致的质量增加。参数P是由于不连续事件引起的质量增益的量度,\(f_P \)是此类事件的频率。这两个参数都可能与氧化皮的脱落和生长应力有关。该模型的应用证明了Cr-Si基合金在\(1200 ^ {\ circ} \ hbox {C} \)的合成空气中氧化100小时的效果。对于这些合金,讨论了质量增益不连续性的起源,并更详细地解释了P\(f_P \)的含义。使用这个新开发的模型,可以深入了解氧化皮的生长和抗氮化性以及氧化皮的附着力。

更新日期:2021-04-27
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