纳米Al_2O_3填料增强PEEK-PTFE复合材料基于环-块摩擦结构的摩擦过程研究  

Study on Tribological Properties Evolution of PTFE Composites Filled with PEEK and Nano-Al_2O_3 Based on Block-on-ring Friction Model

作　　者：祁渊[1] 龚俊[1] 杨东亚[1] 王宏刚[2] 高贵[2] 任俊芳[2] 陈生圣[2] QI Yuan;GONG Jun;YANG Dongya;WANG Honggang;GAO Gui;REN Junfang;CHEN Shengsheng(School of Mechanical & Electronical Engineering,Lanzhou University of Technology,Lanzhou 730050;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000)

机构地区：[1]兰州理工大学机电工程学院,兰州730050 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000

出　　处：《材料导报》2019年第10期1756-1761,共6页Materials Reports

基　　金：国家自然科学基金(51165022);甘肃省自然科学基金(1606RJZA166)~~

摘　　要：本研究旨在探索纳米Al_2O_3填料增强PEEK-PTFE复合材料摩擦过程中摩擦学性能的演变规律。用不同体积比的聚醚醚酮(PEEK)和纳米Al_2O_3对聚四氟乙烯(PTFE)进行填充改性,经专用模具冷压、烧结炉烧结成型制备得到复合材料样品。利用MRH-3型高速环-块摩擦试验机进行摩擦磨损性能测试,获取不同阶段摩擦学性能数据,计算出整个摩擦实验过程中样品的瞬时磨损率。利用扫描电镜(SEM)和仿真模拟软件(ABAQUS)分别对摩擦过程中对偶钢环表面形貌的演化和复合材料的接触应力变化进行分析。结果表明:PEEK和纳米Al_2O_3可以协同提高PTFE的抗磨损性能,其中10%PEEK/PTFE具有最佳的抗磨损性能(3.69×10^(-6)mm^3/(N·m))和最低的摩擦系数(0.19)。添加5%的纳米Al_2O_3后,复合材料的硬度和热扩散系数有了显著提高。材料的瞬时磨损率在摩擦过程中呈先增大再降低最后保持平稳的变化趋势。试样的接触压力在摩擦初期随磨损量的增大而急剧降低,后期则逐渐趋于稳定。The present work aimed at exploring the tribological properties evolution of PEEK-and nano-Al 2O 3-filled PTFE composites during the friction process.PTFE was referenced with different volume fraction PEEK and Al 2O 3 nanoparticles,then cold pressed and sintered by welding furnace according to the temperature control program.The tribological performance of composites was measured by MRH-3 tribological behavior tes-ter,which provided experimental data at different friction stages,and the instantaneous wear rate was calculated throughout the entire friction process.The morphology of the wear surface of samples and the transfer film on the counterpart ring was observed with scanning electronic microscopy(SEM).Analysis of contact stress of composites in friction process was carried out by using simulation software ABAQUS.The results showed that the PEEK and nano-Al 2O 3 particles significantly improve the wear resistance of PTFE.PTFE composite filled with 10%PEEK particles displays the best wear resistance performance(wear rate 3.69×10^-6 mm^3/(N·m))and the lowest friction coefficient(0.19),and the addition of 5%nano-Al 2O 3 contributes to higher hardness and thermal diffusivity.The instantaneous wear rate appeared to increase first sharply and then decrease during the friction process,and finally maintained a steady change trend.The contact pressure of the sample was determined to decrease rapidly with the increase of the loss mass in the initial stage of friction,and gradually level off at the later stage.

关 键 词：聚四氟乙烯 纳米氧化铝 聚醚醚酮 环-块摩擦结构 摩擦学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]