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Surface orientation effects on initial carbon deposition and metal dusting of nickel

机译：表面取向对镍初始碳沉积和金属粉尘的影响

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摘要

Polished polycrystalline nickel was first characterised by orientation imaging microscopy to search for grains with low index faces, and then reacted in a gas of 25 percent CO-25 percent H_2-0.5 percent H_2O-49.5 percent Ar at 650 deg C for different times. Carbon deposition on and metal dusting of these grains were examined by scanning electron microscopy and cross-section observations made by focused ion beam milling. Carbon deposition was found to be the fastest on nickel (111) face, slowest on nickel (001), and somewhere in between on other faces. The carbon morphology varied from a featureless uniform layer on (111) face to aligned needles or leaves on (101) and other faces. This phenomenon can be explained in terms of a graphite-nickel epitaxial relationship. Initial metal dusting was affected by nickel surface orientation in a more complicated way. The (001) face produced initially little or no carbon deposition, and therefore no carbon attack in most area, but dusted locally after 22 h reaction. Local dusting attack was also found to correspond well with localised graphite nucleation. Different surface nickel grains were found to change height with reaction time, a difference attributed to varying extents of carbon dissolution.
机译：首先通过定向成像显微镜对抛光的多晶镍进行表征，以搜索具有低折射率面的晶粒，然后在650℃下于25％CO-25％H_2-0.5％H_2O-49.5％Ar的气体中反应不同的时间。通过扫描电子显微镜和通过聚焦离子束研磨进行的横截面观察检查了这些晶粒上的碳沉积和金属粉尘。发现碳沉积在镍（111）面上最快，在镍（001）上最慢，并且在其他面上介于两者之间。碳的形态从（111）面上无特征的均匀层变化为（101）面上的对齐针或叶以及其他面上的碳形态。这种现象可以用石墨-镍外延关系来解释。最初的金属粉尘以更复杂的方式受到镍表面取向的影响。 （001）面最初很少或没有碳沉积，因此在大多数区域没有碳侵蚀，但在22 h反应后局部撒粉。还发现局部除尘攻击与局部石墨成核非常吻合。发现不同的表面镍晶粒会随着反应时间而改变高度，这种差异归因于碳溶解程度的不同。

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