Abstract

Electrochemical deposition of Ni–SiC composite coatings with submicrometer silicon carbide powder from a suspension electrolyte stabilized by vibrational mixing was studied. The structural features of the coating are described. Irrespective of the vibrational mixing conditions, thin coatings are layers with pronounced relief. Examination of the cross sections shows that the basic fragments forming the relief are metal–ceramic fragments consisting of SiC particles and nickel. A detailed study of thin sections shows that a nickel film is present on the surface of each particle, which indicates that the metal is reduced, in particular, on the particle surface. In the structure of thick composite coatings, agglomerations of SiC particles are also revealed. A coating formation mechanism consisting in the adsorption of SiC particle agglomerates and instantaneous nickel deposition on their surface was suggested. The results of analysis of the coating metal matrix by backscattered electron diffraction agree with the suggested mechanism.

中文翻译：

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振动混合制备亚微米级 Ni-SiC 复合电化学涂层的结构特征

摘要

研究了通过振动混合稳定的悬浮电解质中亚微米碳化硅粉末的 Ni-SiC 复合涂层的电化学沉积。描述了涂层的结构特征。无论振动混合条件如何，薄涂层都是具有明显起伏的层。对横截面的检查表明，形成浮雕的基本碎片是由 SiC 颗粒和镍组成的金属陶瓷碎片。对薄片的详细研究表明，每个颗粒的表面都存在镍膜，这表明金属被还原，特别是在颗粒表面。在厚复合涂层的结构中，还揭示了 SiC 颗粒的团聚。提出了涂层形成机制，包括碳化硅颗粒团聚物的吸附和其表面的瞬时镍沉积。通过背散射电子衍射对涂层金属基体进行分析的结果与所提出的机制一致。