叶蛇纹石和硅灰石对聚四氟乙烯摩擦磨损行为的影响  

Influences of Antigorite and Wollastonite on Friction and Wear Behaviors of Polytetrafluoroethylene

作　　者：王晨 白志民[1] 于鹤龙 尹艳丽 宋占永 王申 杨喆 WANG Chen;BAI Zhimin;YU Helong;YIN Yanli;SONG Zhanyong;WANG Shen;YANG Zhe(School of Materials Science and Engineering,China University of Geosciences,Beijing 100083,China;National Key Lab for Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China;School of Printing,Packaging and Digital Media,Xi'an University of Technology,Xi’an 710048,China)

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083 [2]陆军装甲兵学院再制造技术国家级重点实验室,北京100072 [3]西安理工大学印刷包装与数字媒体学院,西安710048

出　　处：《硅酸盐学报》2024年第6期2081-2093,共13页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52075544)。

摘　　要：将层状硅酸盐矿物引入聚合物以改善其摩擦学性能的研究,为发展智能自修复型复合材料提供了新思路。将叶蛇纹石和硅灰石粉体作为填料引入聚四氟乙烯(PTFE),通过球磨混合-冷压成型-无压烧结的方式制备得到不同成分的矿物增强PTFE基复合材料。研究了复合材料物相结构、微观形貌与成分、邵氏硬度和干摩擦条件下的摩擦磨损行为,讨论了叶蛇纹石和硅灰石粉体对PTFE/高碳铬轴承钢摩擦副的减摩抗磨协同机制。结果表明:得益于矿物对PTFE的强化作用和对偶表面兼具高硬度和自润滑特性的摩擦反应膜的形成,复合材料表现出优异的摩擦学性能;与添加单一叶蛇纹石相比,硅灰石矿物的添加降低了叶蛇纹石的相变温度,促进了摩擦反应膜的形成,对改善复合材料的摩擦学性能具有良好的协同作用;同时添加10%(质量分数)叶蛇纹石和20%(质量分数)硅灰石的PTFE基复合材料平均摩擦系数和磨损体积较纯PTFE分别降低44.2%和71.4%。Introduction Studies on introducing phyllosilicate minerals into polymers to improve their tribological properties can provide some ideas for the development of intelligent self-healing composite materials.Polytetrafluoroethylene(PTFE)is widely used as one of engineering materials and solid lubricating materials due to its good self-lubricating ability,thermal stability,corrosion resistance and machinability.However,the molecular bond structure of PTFE exhibits unique slip characteristics during crystallization,making it prone to creep and resulting in a poor wear resistance.It is thus necessary for the modification of PTFE to improve the mechanical properties and tribological performance for engineering applications.The modification methods mainly include surface modification,blending modification,and filling modification.Recent studies indicate that the introduction of minerals such as serpentine,attapulgite,and sepiolite into PTFE can obtain PTFE-based composites with uniform mineral dispersion and excellent thermal stability,mechanical properties,and tribological properties due to the property of phyllosilicate minerals to intercalate monomer or polymer molecules.In this paper,antigorite and wollastonite minerals reinforced PTFE-based composites were prepared.The tribological properties of the composites were investigated,and the mechanism of the tribological properties improvement of PTFE caused by antigorite and wollastonite was discussed based on the worn surface analysis.Methods Antigorite(Atg)was extracted from natural deposited serpentine mineral in Anshan,China.Wollastonite(Wl)was provided by Dalian Global Mineral Co.,Ltd.,China.Polytetrafluoroethylene(PTFE)was purchased from Shandong Dongyue Co.,China.The phase structure,functional groups and thermodynamic behaviors of the mixed raw powders were characterized by a model D8 Advance X-ray diffractometer(XRD),a model Nicolet 6700Fourier infrared spectrometer(FT−IR)and a model NETZSCH STA 449C simultaneous thermal analyzer(TG−DSC),respectively.The Sho

关 键 词：叶蛇纹石 硅灰石 聚四氟乙烯 摩擦反应膜 摩擦磨损 

分 类 号：TD985[矿业工程—选矿]