Transition in high-temperature oxidation kinetics of Pd-modified aluminide coatings: Role of oxygen partial pressure, heating rate, and surface treatment
Transition in high-temperature oxidation kinetics of Pd-modified aluminide coatings: Role of oxygen partial pressure, heating rate, and surface treatment
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钯改性铝化物涂层高温氧化动力学的转变：氧分压、加热速率和表面处理的作用
DOI：
10.1557/jmr.2000.0099
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发表时间：
2000
影响因子：
2.7
通讯作者：
B. Pieraggi
中科院分区：
文献类型：
--
作者：
D. Monceau;K. Bouhanek;R. Peraldi;A. Malie;B. Pieraggi
研究了Pd改性镍铝化物涂层的等温氧化行为与PO2和温度(900~1200℃)的关系。掠入射X射线衍射、热重分析、X射线光电子能谱、扫描电子显微镜/能谱和二次离子质谱仪分析表明，δ-Al_2O_3或α-Al_2O_3在此转变温度以下或以上的生长是一致的。此外，由于PO2是在样品加热之前建立的，因此观察和分析了升温速率的影响。更重要的是，喷砂样品在低PO2氧化条件下没有观察到动力学转变。因此，从报道的结果可以确定α-Al_2O_3氧化膜直接生长的条件。
The isothermal oxidation of Pd-modified Ni aluminide coatings was studied as a function of P o_2 and temperature (900–1200 °C). A kinetic transition was observed between 900 and 1000 °C. Grazing incident x-ray diffraction, thermogravimetric analysis, x-ray photoelectron spectroscopy, scanning electron microscopy/energy dispersive spectroscopy, and secondary ion mass spectrometry analyses are consistent with the growth of δ-alumina or α-alumina below or above this transition temperature. Moreover, because P o_2 was established before specimen heating, an effect of heating rate was observed and analyzed. More importantly, no kinetic transition was observed for sand-blasted specimens oxidized at low P o_2. Thus conditions for the direct growth of an α-alumina scale could be determined from the reported results.