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Microstructures of chromia scales grown in CO2

机译:在二氧化碳中生长的氧化铬鳞片的微观结构

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Scales grown on chromia forming alloys in CO2 are less protective than those developed during exposure to oxygen or air. Reaction with CO2 leads to faster chromia scale growth, the more rapid onset of breakaway and internal carburisation of the alloy. Conventional and laser Raman microscopy studies of Fe-Cr alloys show that local fluctuations in scale thickness are associated with varying degrees of chromium depletion. Local conversion of Cr2O3 to spinel leads to rapid outward iron diffusion and nucleation of Fe-rich oxide nodules. A TEM investigation reveals that reaction in CO2 produces finer grained Cr2O3, inward scale growth and more rapid scaling, as well as internal carburisation. Appropriate silicon additions to the alloys lead to the formation of a thin, glassy silica layer beneath the chromia, greatly slowed chromia thickening rates and the prevention of carburisation. Atom probe tomography is used to locate carbon within the chromia.
机译:与暴露于氧气或空气中形成的氧化皮相比,在二氧化碳中形成氧化铬的合金上生长的氧化皮防护性较差。与CO2的反应导致更快的氧化铬垢增长,合金的断裂和内部渗碳更快地开始。 Fe-Cr合金的常规和激光拉曼显微镜研究表明,氧化皮厚度的局部波动与铬耗竭程度的变化有关。 Cr2O3局部转化为尖晶石会导致快速的铁向外扩散和富铁氧化物结核的成核作用。 TEM研究表明,CO2中的反应产生更细的Cr2O3,向内结垢生长和更快速的结垢,以及内部渗碳。向合金中适当添加硅会导致氧化铬下方形成一层薄的玻璃状二氧化硅层,大大减慢了氧化铬的增稠速度并防止了渗碳。原子探针层析成像用于在氧化铬中定位碳。

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