Physical and Chemical Evolution of PTFE-α-Al2O3 Composites Versus 304 SS Tribofilms During Dry Sliding

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Faysal M. Haque, Christopher P. Junk, Mark A. Sidebottom
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Abstract

Polytetrafluoroethylene (PTFE) is renowned for its remarkably low friction coefficient (µ ~ 0.1) yet exhibits notably high wear rates (K ~ 104) in dry sliding applications. To mitigate this, various metallic and non-metallic fillers have been explored, consistently demonstrating a reduction in wear rates of unfilled PTFE between 10 and 104 times. Among these fillers, α-Al2O3 is one of the most extensively studied materials. 5 wt% of α-Al2O3 filler into PTFE yields a composite material, PTFE- α-Al2O3, characterized by a wear rate a staggering 104 times lower than unfilled PTFE. This reduction in wear has been attributed to the formation of tribofilms on the PTFE composite and metal counterbody material. These tribofilms emerge due to the interaction between broken fluropolymer chains and environmental water and oxygen. This interaction results in the creation of carboxylate salt groups, which subsequently react with metal/metal oxide particles (both from the counterbody and the metal filler) to form tribofilms. Despite numerous studies scrutinizing the chemical composition of the tribofilms pre- and post-test, the chemical development of these films has remained largely unexplored. In this study, the authors utilize attenuated total reflection infrared spectroscopy (ATR-IR), transmission infrared (IR) spectroscopy, optical microscopy, and stylus profilometry to observe tribofilm development. A thorough topographical and chemical description of the tribofilm is provided via these techniques. The ratio of carboxylate salt groups directly corresponds with improved wear performance and these changes are very local to the worn polymer surface. This discovery contributes to a deeper understanding of the tribological behavior of PTFE-α-Al2O3 composites.

Graphical Abstract

聚四氟乙烯-α-Al2O3 复合材料与 304 SS 三膜在干滑动过程中的物理和化学变化
聚四氟乙烯(PTFE)以其极低的摩擦系数(µ ~ 0.1)而闻名,但在干滑动应用中却表现出明显的高磨损率(K ~ 104)。为了缓解这一问题,人们对各种金属和非金属填料进行了研究,结果表明,未填充的聚四氟乙烯的磨损率可降低 10 到 104 倍。在这些填料中,α-Al2O3 是研究最为广泛的材料之一。在聚四氟乙烯中加入 5 wt% 的 α-Al2O3 填充剂,可产生一种名为 PTFE- α-Al2O3 的复合材料,其磨损率比未填充的聚四氟乙烯低 104 倍。磨损率降低的原因是聚四氟乙烯复合材料和金属对体材料上形成了三膜。这些三膜的形成是由于断裂的氟聚合物链与环境中的水和氧相互作用的结果。这种相互作用会产生羧酸盐基团,随后与金属/金属氧化物颗粒(包括金属基体和金属填料)发生反应,形成三膜。尽管有许多研究对测试前后三膜的化学成分进行了仔细研究,但这些薄膜的化学发展在很大程度上仍未得到探讨。在本研究中,作者利用衰减全反射红外光谱(ATR-IR)、透射红外(IR)光谱、光学显微镜和测针轮廓仪来观察三膜的发展。这些技术提供了三膜的全面地形和化学描述。羧酸盐基团的比例与磨损性能的改善直接相关,而且这些变化在磨损的聚合物表面非常局部。这一发现有助于加深对 PTFE-α-Al2O3 复合材料摩擦学行为的理解。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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