Reactive spreading: Adsorption, ridging and compound formation
Reactive spreading: Adsorption, ridging and compound formation
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DOI：
10.1016/s1359-6454(00)00231-7
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发表时间：
2000-12-01
期刊：
影响因子：
9.4
通讯作者：
Tomsia, AP
中科院分区：
文献类型：
--
作者：
Saiz, E;Cannon, RM;Tomsia, AP
反应扩散是指加入一种化学活性元素来促进贵金属在非金属材料上的润湿。概述了扩散过程的能量学和动力学理论，以便与通常伴随反应性润湿的化合物地层中的步骤进行比较。这些包括：流体流动，活性金属吸附。包括非平衡效应和三线脊。在一定条件下，它们的成核速度都比复合成核快。这种分析加上对最近报道的金属/陶瓷系统实验的评估，导致人们关注那些在界面上新相实际形成之前扩散进行的条件。这种情况可能比通常认为的更为典型，而且可能是导致传播加剧的最有效情况。在高温润湿过程中观察到的缓慢扩散速率加上普遍变异性和滞后的基本原理也出现了。(C) 2000 Elsevier Science Ltd.Elsevier Science Ltd.出版。版权所有。
Reactive spreading, in which a chemically active element is added to promote wetting of noble metals on nonmetallic materials, is evaluated mechanistically. Theories for the energetics and kinetics of the steps involved in spreading are outlined to permit comparison to the steps in the compound formation that typically accompanies reactive wetting. These include: fluid flow, active metal adsorption. including nonequilibrium effects, and triple line ridging. They can all be faster than compound nucleation under certain conditions. This analysis plus assessment of recently reported experiments on metal/ceramic systems lead to a focus on those conditions under which spreading proceeds ahead of the actual formation of a new phase at the interface. This scenario may be more typical than commonly believed, and perhaps is the most effective situation leading to enhanced spreading. A rationale for the slow spreading rates plus the pervasive variability and hysteresis observed during high-temperature wetting also emerges. (C) 2000 Elsevier Science Ltd. Published by Elsevier Science Ltd. All rights reserved.