Formation mechanism of electrical discharge TiC-Fe composite coatings
Formation mechanism of electrical discharge TiC-Fe composite coatings
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DOI：
10.1016/j.jmatprotec.2016.12.011
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发表时间：
2017-05-01
影响因子：
6.3
通讯作者：
Clare, A. T.
中科院分区：
文献类型：
--
作者：
Murray, J. W.;Algodi, S. J.;Clare, A. T.
比较了304不锈钢上放电（艾德）处理的单一存款和连续TiC-Fe金属陶瓷涂层（由牺牲粉末冶金TiC工具电极在负极性下形成），提供了对艾德涂层（EDC）形成机理的洞察。来自单个火花事件的存款主要由TiC，从类似于2wt%的Fe基体分离的相，具有强烈排列的晶粒和带状显微组织，指示从涂层/基材界面固化。相反，连续涂层，每个位置经受类似于200个火花事件，表现出更复杂的带状微观结构，在类似于30重量%的铁基基体内具有等轴和柱状TiC晶粒的混合物，沿着有来自油电介质的一些浓度的碳。据认为，每个火花事件再熔化先前固化的涂层材料，有或没有进一步的TiC颗粒掺入，导致逐渐TiC稀释和TiC-Fe复合涂层的发展与形成基体的基底材料的水平增加。(C)2016作者（S）由爱思唯尔公司出版
Comparison of electric discharge (ED) processed single deposit and continuum TiC-Fe cermet coatings, formed from a sacrificial powder metallurgy TiC tool electrode at negative polarity, on 304 stainless steel, provided insight into the ED coating (EDC) formation mechanism. A deposit from a single spark event was dominated by TiC, phase separated from similar to 2 wt% Fe matrix, with strongly aligned grains and banded microstructure, indicative of solidification from the coating/substrate interface. Conversely, a continuum coating, subjected to similar to 200 spark events per location, exhibited a more complex, banded microstructure, with a mixture of equiaxed and columnar TiC grains within similar to 30 wt% Fe-based matrix, along with some concentrations of carbon from the oil dielectric. It is considered that each sparking event remelts previously solidified coating material, with or without further TiC particle incorporation, leading to gradual TiC dilution and the development of a TiC-Fe composite coating with increasing levels of substrate material forming the matrix. (C) 2016 The Author(s). Published by Elsevier B.V.