稀土混合纳米颗粒改性对酚醛树脂基摩擦材料力学性能和摩擦学性能的影响  

Effects of Rare Earth Mixed Nanoparticles Modification on Mechanical and Tribological Properties of Phenolic Resin-Based Friction Materials

作　　者：谷杨浪 赵运才[1] 孙嘉晨 邹耀平 万邵晨 GU Yanglang;ZHAO Yuncai;SUN Jiachen;ZOU Yaoping;WAN Shaochen(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Huawu Brake Co.,Ltd.,Fengcheng 331100,China)

机构地区：[1]江西理工大学机电工程学院,赣州341000 [2]江西华伍制动器股份有限公司,丰城331100

出　　处：《机械工程材料》2024年第10期71-77,共7页Materials For Mechanical Engineering

基　　金：横向科研项目协助项目(2020360709000149)。

摘　　要：制备了不同质量分数稀土CeO_(2)(1.0%,1.5%,2.0%)、Y_(2)O_(3)(1.0%,1.5%,2.0%)混合纳米Si O_(2)(2.0%,3.0%,4.0%)改性酚醛树脂基摩擦材料,通过正交试验进行配方设计,结合极差分析研究了改性材料对力学性能和摩擦磨损性能的影响,得出最佳添加量,分析了改性摩擦材料的磨损机理。结果表明:稀土Ce O_(2)、Y_(2)O_(3)混合纳米Si O_(2)改性摩擦材料的洛氏硬度在62~78 HRL范围内,剪切强度在31.4~34.5 MPa范围内;Ce O_(2)、Y_(2)O_(3)和纳米Si O_(2)最佳质量分数分别为2.0%,2.0%,3.0%,此时试样在中温阶段(200~250℃)的磨损率较小、较稳定,摩擦因数较大,硬度较大,剪切强度最大;最佳添加量下,试样中填料组织分布均匀、尺寸细小、与树脂基体黏结牢固,石墨形成连续摩擦平台,剪切断面呈撕裂不规则状,磨损面中平整区域多,无明显划痕和沟槽;改性摩擦材料在中温阶段的磨损机理主要为热疲劳磨损和磨粒磨损。The rare earth Ce O_(2) (1.0%,1.5%,2.0%) and Y_(2)O_(3) (1.0%,1.5%,2.0%) mixed NanoSi O_(2) (2.0%,3.0%,4.0%) with different mass fraction modified phenolic resin-based friction material was prepared.The formula was designed through orthogonal tests,and the effects of the modified material on mechanical properties and friction and wear properties were studied by combining range analysis.The optimal addition was obtained.The wear mechanism of modified friction material was analyzed.The results show that the rare earth Ce O_(2) and Y_(2)O_(3) mixed Nano-Si O_(2) modification significantly improved the mechanical properties and friction and wear properties of the friction materials.The Rockwell hardness of the rare earth Ce O_(2) and Y_(2)O_(3) mixed Nano-Si O_(2) modified friction material was62?78 HRL,and the shear strength was 31.4?34.5 MPa.The optimal mass fraction of Ce O_(2),Y_(2)O_(3) and Nano-Si O_(2) was2.0%,2.0%and 3.0%,respectively.In this case,the wear rate of the sample at the medium temperature stage (200?250℃) was small and stable,the friction coefficient and hardness was large,and the shear strength reached maximum.Under the optimal addition,the packing structure in sample was evenly distributed,small in size,and firmly bonded with the resin matrix.The graphite formed a continuous friction platform.The shear section presented an irregular tearing shape,and there were many smooth areas in the wear surface,without obvious soratches and grooves.The wear mechanism of the modified friction material at the medium temperature stage was mainly thermal fatigue wear and abrasive wear.

关 键 词：稀土氧化物 纳米颗粒 树脂基摩擦材料 正交试验 摩擦学性能 

分 类 号：TH117.1[机械工程—机械设计及理论]