On ultra‐high temperature oxidation of Cr–Cr3Si alloys: Effect of germanium

On ultra‐high temperature oxidation of Cr–Cr3Si alloys: Effect of germanium
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CrâCr3Si 合金的超高温氧化:锗的影响

DOI:
10.1002/maco.201307423
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发表时间:
2014
期刊:
Materials and Corrosion
影响因子:
--
通讯作者:
M.C. Galetz
M.C. Galetz
中科院分区:
--
文献类型:
--
作者:
A. Soleimani‐Dorcheh;W. Donner;M.C. Galetz

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研究了Cr 85 GeXSi 1 −X(0 <X< 15)组成范围内的Cr-Cr 3(Si 1 −XGeX)合金在1350 °C的氧化行为。热重测量表明,改善氧化动力学合金化高达2%的锗,但观察到一个显着的重量损失时,加入更高的锗。相分析和组成的剥落的氧化物规模和子规模的合金基板显示,eskolaite(Cr2 O3)形成的保护规模,而SiO2(方石英)是局部形成的氧化铬规模以下。添加高达2原子%的改变了局部形成的二氧化硅的形态,随后影响了氧化铬规模的spectrometry。讨论了所有合金在1350 °C下氧化的不同氧化铬鳞的形态观察。
The oxidation behavior of Cr–Cr3(Si1−XGeX) alloys with the composition range Cr85GeXSi1−X(0 <X< 15) was studied at 1350 °C. Thermogravimetric measurements showed improved oxidation kinetics by alloying up to 2 at% of Ge, but a significant weight loss was observed when higher Ge was added. Phase analysis and composition of the spalled oxide scales and subscale alloy substrates revealed that eskolaite (Cr2O3) forms the protective scale, while SiO2(cristobalite) is locally formed below the chromia scale. Addition of up to 2 at% altered the morphology of locally formed silica and subsequently affected the spallation of chromia scale. The morphological observations of the different chromia scales are discussed for all alloys oxidized at 1350 °C.
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发表时间: 1980-01-01
影响因子: 3.9
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