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Initial chemical transport of reducing elements and chemical reactions in oxide cathode base metal

机译：氧化物阴极贱金属中还原元素的初始化学迁移和化学反应

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In the present work, the formation of compounds associated to the diffusion of reducing elements (Mg and Al) to the nickel surface of a one-piece oxide cathode has been studied. Those compounds have been evidenced after the annealing steps at high temperature performed on cathode base metal prior to the emitting coating deposition. Therefore, they form the "initial" interface between the nickel and the coating, in other words, the interface existing at the beginning of cathode life. Extensive analysis to characterize the nickel base prior to coating deposition has been performed by means of scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX), Auger electron spectroscopy (AES), transmission electron microscopy (TEM), and glow discharge optical emission spectroscopy (GDOES). TEM and AES analysis have allowed to identify for the first time a spinel compound of MgAl2O4. The preferential distribution of the different compounds on the nickel surface has been studied by EDX mapping. Experimental profiles of diffusion of the reducing elements in the nickel have been obtained over the entire thickness of the material by GDOES. The mechanism of formation of these compounds together with a related diffusion model are proposed. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 6]
机译：在本工作中，已经研究了与还原元素（Mg和Al）扩散到整体式氧化物阴极的镍表面有关的化合物的形成。这些化合物已在发光涂层沉积之前在阴极贱金属上进行的高温退火步骤之后得到了证明。因此，它们在镍和涂层之间形成“初始”界面，换句话说，在阴极寿命开始时存在的界面。已经通过扫描电子显微镜（SEM）与能量色散X射线光谱（EDX），俄歇电子能谱（AES），透射电子显微镜（TEM）和透射电子显微镜（SEM）结合进行了广泛的分析，以表征涂层沉积之前的镍基。辉光放电光发射光谱法（GDOES）。 TEM和AES分析首次允许鉴定出MgAl2O4的尖晶石化合物。通过EDX映射研究了镍表面上不同化合物的优先分布。通过GDOES已经获得了还原元素在镍中扩散的实验分布图。提出了这些化合物的形成机理以及相关的扩散模型。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：6]

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