Grain refinement: A mechanism for graphene nanoplatelets to reduce friction and wear of Ni₃Al matrix self-lubricating composites

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• 作者：Wenzheng Zhai ; Xiaoliang Shi ; Mang Wang ; Zengshi Xu ; Jie Yao ; Siyuan Song ; Yufu Wang
• 关键词：Sliding wear ; Solid lubricants ; Electron microscopy ; Surface analysis
• 刊名：Wear
• 出版年：15 February, 2014
• 年：2014
• 卷：310
• 期：1-2
• 页码：33-40
• 全文大小：7278 K

文摘

Investigations in graphene of controlling friction and wear of Ni₃Al matrix self-lubricating composites (NMSC) are needed for moving mechanical assemblies. The friction and wear behaviors of NMSC with graphene nanoplatelets (GNPs) against Si₃N₄ ball are tested using a constant load of 10 N and a constant speed of 0.2 m/s from room temperature (RT) to 600 掳C. Tribological test results have revealed that small amounts of GNPs in the NMSC are able to drastically reduce the friction coefficients and wear rates over the effective operating range (RT-400 掳C). A possible explanation for these results is that the refinement of grains accompanying the slippage of laminated sheets between GNPs could provide a source of the stress dissipation and form the GNP protective layer during sliding process, leading to the reduction of wear rates as well as the friction coefficients. It is concluded that GNPs hold great potential applications as an effective solid lubricant for moderate loads and stress, and can be easily used for the preparation of the self-lubricating composites in the future.