A“bricks-and-mortar”structured graphene oxide/polyvinyl alcohol coating:Enhanced water interfacial lubrication and durability  

作　　者：Hanglin LI Lin DING Jingchun ZHANG Zhaoyang GUO Yazhuo SHANG Honglai LIU Xiangqiong ZENG Jiusheng LI 

机构地区：[1]Key Laboratory for Advanced Materials,School of Chemistry&Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Laboratory for Advanced Lubricating Materials,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China [3]School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Friction》2024年第12期2657-2678,共22页摩擦（英文版）

基　　金：the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB 0470202);the International Partnership Program of Chinese Academy of Sciences Project for Grand Challenges(No.307GJHZ2022034GC);the Science and Technology Development Fund of Pudong New District(No.PKJ2020-N007);the Fundamental Research Funds for the Central Universities(No.222201717003)for their financial support.

摘　　要：Coatings serve as ideal protective films for mechanical systems,providing dependable as well as efficient lubrication because of their unique structure along with outstanding tribological characteristics.Inspired by the“bricks-and-mortar”structure,we prepared layered graphene oxide(GO)composite finishes strengthened with polyvinyl alcohol(PVA)and borax.Our study demonstrates that the tribological properties of the GO-based coating on 304 stainless steel(SS304)are potentially greatly affected through PVA,GO,and annealing.By optimizing the composition,we achieved the PVA_(40 wt%)/GO_(0.01 wt%)/borax composite coating,which exhibited the lowest average coefficient of friction(COF)of 0.021±0.003(a 97.86%reduction compared to control SS304)with minimal wear and abrasion even in a water environment.We found that the enhanced mechanical characteristics as well as elastic recovery within the coating were attributed to the hydrogen bonds and cross-linking between PVA and borax,which led to stress distribution.Reduced friction was further aided by the formation of a hydrated layer at the friction interface.As a result,the coating demonstrated remarkable durability,maintaining a low COF during long sliding distances(576 m,28,800 cycles,significantly longer than previously reported)without breaking.

关 键 词：graphene oxide COATING water lubrication anti-wear properties DURABILITY 

分 类 号：TH117.2[机械工程—机械设计及理论]