Codeposition of inorganic fullerene-like WS₂ nanoparticles in an electrodeposited nickel matrix under the influence of ultrasonic agitation

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• 作者：E. Garc铆a-Lecina ; I. Garc铆a-Urrutia ; J.A. D铆ez ; J. Fornell ; E. Pellicer ; J. Sort
• 关键词：Composite coating ; IF-WS2 ; Electrodeposition ; Nickel ; Ultrasound agitation
• 刊名：Electrochimica Acta
• 出版年：30 December, 2013
• 年：2013
• 卷：114
• 期：Complete
• 页码：859-867
• 全文大小：3419 K

文摘

The effects of ultrasound (US) agitation (at different intensities of ultrasound) on the codeposition of inorganic fullerene-like (IF) WS₂ in a metallic Ni matrix are investigated. The wt.% of IF-WS₂ particles in the nanocomposite coatings increases from 4.5 wt.% (in films grown under mechanical stirring but without US agitation) up to about 7 wt.% (in films prepared under US agitation at the optimum intensity of ultrasound). While composite coatings obtained only under mechanical stirring exhibit a rather irregular surface morphology, with pronounced 3D multinodular protrusions, a more uniform and compact coating is attained under application of US agitation. In turn, the introduction of WS₂ particles significantly modifies the growth of Ni, inducing grain size refinement, increasing the stacking fault probability and causing a drastic change of crystallographic texture. These microstructural features act in a synergistic manner to simultaneously increase the hardness of the composite coatings while causing the expected decrease in the friction coefficient (due to the presence of WS₂ solid lubricant particles), therefore enhancing the wear resistance, particularly when the coatings are deposited under the presence of US.