Synergistically assembled RGO/Si_(3)N_(4) whiskers hybrid aerogels to endow epoxy composites with excellent thermal and tribological performance  

作　　者：Yongjun ZHOU Yuanya ZHANG Meng LIU Yanling WANG Junya YUAN Xuehu MEN 

机构地区：[1]School of Materials and Energy,Lanzhou University,Lanzhou 730000,China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Friction》2023年第11期2091-2106,共16页摩擦（英文版）

基　　金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China(Grant No.52005487);Natural Science Foundation of Gansu Province(Grant No.20JR10RA057).

摘　　要：Epoxy resin(EP)composites with satisfactory thermal and tribological performance are highly required for engineering moving components.However,the simple addition of fillers leaded to the serious filler agglomeration and limited promotion in tribological properties.In this work,we constructed a new kind of three-dimensional(3D)reduced graphene oxide(RGO)/Si_(3)N_(4) hybrid aerogel for EP composites,which was prepared by a facile hydrothermal self-assembly method followed by freeze-drying technique.As a result,the dispersibility of Si_(3)N_(4) whiskers was greatly improved through wrapping of polydopamine–polyethyleneimine copolymer(PDA–PEI)copolymer and physical spacing of 3D skeleton.Furthermore,benefiting from the synergistic effect of RGO and Si_(3)N_(4)@PDA–PEI in the thermal network,the thermal conductivity of RGO/Si_(3)N_(4) hybrid aerogel(GSiA)–EP increased by 45.4%compared to that of the neat EP.In addition,the friction coefficient and wear rate of GSiA–EP decreased by 83.7%and 35.8%,respectively.This work is significant for opening a tribological performance enhancement strategy though constructing 3D hybrid architecture.

关 键 词：three-dimensional(3D)hybrid structure reduced graphene oxide(RGO)/Si_(3)N_(4)hybrid aerogel thermal properties tribological properties wear mechanism synergistic effect 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]