石墨烯/多孔聚酰亚胺自润滑保持架材料的制备及其性能  

Preparation and Performances of Graphene/Porous Polyimide Self-Lubricating Cage Materials

作　　者：李媛媛[1,2] 尚晓辉 李柯颖 刘璐瑶 孙小波 LI Yuanyuan;SHANG Xiaohui;LI Keying;LIU Luyao;SUN Xiaobo(Luoyang Bearing Research Institute Co.,Ltd.,Luoyang 471039,China;Henan Key Laboratory of High Performance Bearing Technology,Luoyang 471039,China)

机构地区：[1]洛阳轴承研究所有限公司,河南洛阳471039 [2]河南省高性能轴承技术重点实验室,河南洛阳471039

出　　处：《轴承》2024年第5期164-169,共6页Bearing

基　　金：精密转动和传动机构长寿命技术北京市重点实验室开放基金课题资助项目(BZ0388202304)。

摘　　要：为提高航天长寿命轴承用多孔聚酰亚胺(PPI)保持架材料的自润滑性能,采用机械混合和原位聚合的方式分别制备了石墨烯(GP)改性多孔聚酰亚胺材料,通过扫描电镜、压汞仪、万能拉伸试验机及摩擦试验机等设备对其微孔性能、力学性能以及摩擦学性能进行分析,结果表明:原位聚合能形成“蜂窝状”多孔结构,有利于制备低孔隙率和小孔径的多孔聚酰亚胺材料;石墨烯含量0.5%时,机械混合和原位聚合工艺所制得复合材料的拉伸强度均最高,较未改性PPI分别提高了13.0%和42.3%;石墨烯含量0.5%和1.0%时,原位聚合试样具有更优异的耐磨性,磨损量较未改性PPI分别降低了73.3%和47.8%。In order to improve the self-lubricating performances of porous polyimide(PPI)cage materials for aerospace long-life bearings,the graphene(GP)modified PPI materials are prepared by mechanical mixing and in-situ polymerization,respectively.The microporous properties,mechanical properties and tribological properties of the materials are analyzed by scanning electron microscopy,mercury porosimeter,universal tensile tester and friction tester.The results show that in-situ polymerization can form a"honeycomb"porous structure,which is conducive to preparation of PPI materials with low porosity and small pore diameter;when the content of GP is 0.5%,the tensile strength of composites prepared by mechanical mixing and in-situ polymerization processes is the highest,which is 13.0%and 42.3%higher than that of unmodified PPI,respectively;when the content of GP is 0.5%and 1.0%,the in-situ polymerized samples have better wear resistance,and the wear amount is reduced by 73.3%and 47.8%compared with unmodified PPI,respectively.

关 键 词：滚动轴承 航天轴承 保持架 多孔材料 自润滑 石墨烯 聚酰亚胺 

分 类 号：TH133.33[机械工程—机械制造及自动化] TQ327.7[化学工程—合成树脂塑料工业]