对偶表面粗糙度对Nano-SiO2改性PTFE复合材料摩擦学性能的影响
Effect of Counterpart Surface Roughness on the Tribological Properties of Nano-SiO<sub>2</sub> Modified PTFE Composites
作者：高贵(兰州理工大学 机电工程学院，甘肃 兰州 730050;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，甘肃 兰州 730000)；李瑞红(兰州理工大学 机电工程学院，甘肃 兰州 730050)；龚俊(兰州理工大学 机电工程学院，甘肃 兰州 730050)；王宏刚(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，甘肃 兰州 730000)；杨东亚(兰州理工大学 机电工程学院，甘肃 兰州 730050;兰州理工大学 温州泵阀工程研究院，浙江 温州 325000)；任俊芳(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，甘肃 兰州 730000)；陈生圣(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，甘肃 兰州 730000)
Author：GAO Gui(School of Mechanical and Electrical Eng., Lanzhou Univ. of Technol., Lanzhou 730050, China;State Key Lab. of Solid Lubrication, Lanzhou Inst. of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China)；LI Ruihong(School of Mechanical and Electrical Eng., Lanzhou Univ. of Technol., Lanzhou 730050, China)；GONG Jun(School of Mechanical and Electrical Eng., Lanzhou Univ. of Technol., Lanzhou 730050, China)；WANG Honggang(State Key Lab. of Solid Lubrication, Lanzhou Inst. of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China)；YANG Dongya(School of Mechanical and Electrical Eng., Lanzhou Univ. of Technol., Lanzhou 730050, China;Wenzhou Pump and Valve Eng. Research Inst., Lanzhou Univ. of Technol., Wenzhou 325000, China)；REN Junfang(State Key Lab. of Solid Lubrication, Lanzhou Inst. of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China)；CHEN Shengsheng(State Key Lab. of Solid Lubrication, Lanzhou Inst. of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China)
收稿日期：2018-12-29 年卷（期）页码：2020,52(2):207-214
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：聚四氟乙烯;nano-SiO<sub>2</sub>;对偶表面粗糙度;摩擦转移;转移膜
Key words：PTFE;nano-SiO2;counterpart surface roughness;friction transfer;transfer film
基金项目：国家自然科学基金项目（51675509）；温州市公益性工业科技项目（G20170026）
中文摘要
为了研究干摩擦条件下对偶面粗糙度对纳米粒子填充改性聚四氟乙烯（PTFE）摩擦学性能的影响，采用冷压成型、热烧结的工艺方法制备nano-SiO2填充改性PTFE复合材料；采用LSR-2M型往复摩擦磨损试验机评价了nano-SiO2改性PTFE复合材料与具有3种不同表面粗糙度的对偶钢块（GCr15）之间的摩擦学特性；利用光学显微镜（OM）、扫描电子显微镜（SEM）和能谱仪（EDS）分别表征了转移膜及磨屑的形貌、微观结构以及化学成分，从微观角度揭示nano-SiO2改性PTFE复合材料的摩擦转移机理。试验结果表明：纯PTFE及不同含量nano-SiO2改性PTFE复合材料的摩擦系数随着对偶钢块表面粗糙度的增大整体呈现增大趋势，在粗糙度Ra为0.1的对偶表面上复合材料的摩擦系数随着nano-SiO2含量的增加变化相对较小；在3种不同粗糙度对偶表面上，nano-SiO2的加入均有效降低了PTFE的磨损体积，当填充比例为0.5%时复合材料在粗糙度Ra为1.2的对偶面上摩擦学性能最佳，磨合时间比纯PTFE缩短了近10 min，耐磨性比纯PTFE提高了33.3%；复合材料中nano-SiO2的含量与对偶表面粗糙度存在一定的协同效应，即填充适量nano-SiO2的PTFE复合材料与具有一定表面粗糙度的对偶钢块组成的摩擦配副能有效促进复合材料的摩擦转移，并能在对偶表面形成覆盖率高、均匀、连续、表面较粗糙且与摩擦方向趋向一致的转移膜，有利于降低材料的磨损。
英文摘要
In order to study the effect of counterpart surface roughness on tribological properties of nanoparticles filled polyphenylene(PTFE)composites under dry friction condition, cold compression molding and hot sintering were used to prepare nano-SiO2filled PTFE composites. The tribological properties of nano-SiO2filled PTFE composites sliding on three kinds of counterpart (GCr15) surface with different surface roughness were evaluated by LSR-2M reciprocating friction and wear tester. The morphologies, microstructures and chemical compositions of the transfer films and debris were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), in order to reveal the friction transfer mechanism of nano-SiO2filled PTFE composites from the microscopic perspective. The experimental results showed that the friction coefficients of pure PTFE and different content of nano-SiO2filled PTFE composites increased with the increase of the surface roughness of the steel counterpart, while the friction coefficients were relatively small on the counterpart surface with roughness 0.1. The addition of nano-SiO2effectively reduced the wear volume of PTFE on three different counterpart surface roughness, when the filling ratio was 0.5%, the best tribological property was obtained on the counterpart surface with roughness 1.2, the running-in time was nearly 10 minutes shorter than pure PTFE, and the wear resistance was 33.3% higher than that of pure PTFE. There was a synergistic effect between the content of nano-SiO2and the counterpart surface roughness, the friction pair that compose of PTFE composites filled with nano-SiO2and steel discs counterpart with certain surface roughness can effectively promote the friction transfer of composites, therefore the transfer films with high coverage, uniformity, continuity, rough surface and consistent with the direction of friction on the counterpart surface were formed, which is beneficial for reducing the wear of materials.
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