Study of tribological characteristics and wear mechanism of nano-particle strengthened nickel-based composite coatings under abrasive contaminant lubrication

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• 作者：Du ; Lingzhong ; Xu ; Binshi ; Dong ; Shiyun ; Yang ; Hua ; Tu ; Weiyi
• 关键词：Wear resistance ; Brush plating ; Nano-particle ; Composite coating ; Contaminant
• 刊名：Wear
• 出版年：2004
• 出版时间：November, 2004
• 年：2004
• 卷：257
• 期：9-10
• 页码：1058-1063
• 全文大小：595 K

文摘

In desert areas, abrasive particles entering the machines cause serious wear of the sliding components. To improve the wear resistance of the machine parts, the Al₂O₃, TiO₂, Si₃N₄, diamond nano-particle strengthened nickel-based brush plating composite coatings were prepared by co-deposition of nano-particles with Ni metal–matrix. The effects of different types of nano-particle and nano-particle contents, in the solution, on the tribological properties of the composite coatings under abrasive lubrication conditions were tested on a commercial ball-on-disk friction and wear test machine. The scanning electron microscopy (SEM) was used to reveal the wear mechanisms. The results show that all of the composite coatings have finer microstructures and higher micro-hardness compared with the pure nickel coating, but only n-diamond/Ni and n-Al₂O₃/Ni composite coatings show improved tribological properties. Among them, the n-Al₂O₃/Ni composite coating has the highest cost performance. And the optimum Al₂O₃ nano-particle content in the solution is 20g/L. The main wear mechanisms of the composite coating are plastic deformation, micro-cutting, and scuffing.