Abstract In this work, a series of four composites was developed by incorporation of two solid lubricants (SLs) (total amount 20 wt % and added in a complementary manner) viz. graphite (well known for thermal conductivity as well as good lubricity) and PTFE (Poly tetra fluoroethylene) (well known for excellent lubricity, but poor thermal conductivity) into PAEK (Poly aryl ether ketone) reinforced with short glass fibres. It was of interest to investigate how these two SLs work together, especially when with increasing contents of PTFE, thermal conductivity (TC) of the composites would decrease and lubricity should increase. The composites were characterized for density, TC and mechanical properties. Tribo-testing was done by varying load, velocity and against mild steel counterface. The composites showed very low wear rates (K0 ≈ 10−16 m3/Nm) and ultra-low coefficient of friction (μ ≈ 0.03). With increase in PTFE contents, wear resistance and also TC decreased indicating TC was a dominating parameter to control the wear of composites. Worn surfaces were studied with scanning electron microscopy (SEM), energy dispersive X ray analysis (EDAX), Raman spectroscopy, XPS (X-ray photoelectron spectroscopy) and wettability analysis to understand the wear mechanisms.

中文翻译：

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控制 PAEK 基复合材料摩擦性能的两种固体润滑剂的热导率和润滑性的复杂相互依存关系

摘要 在这项工作中，通过掺入两种固体润滑剂 (SL)（总量为 20 重量％并以互补方式添加）开发了一系列四种复合材料。石墨（众所周知的导热性和良好的润滑性）和 PTFE（聚四氟乙烯）（众所周知的优异的润滑性，但导热性差）变成了用短玻璃纤维增​​强的 PAEK（聚芳醚酮）。研究这两种 SL 如何协同工作很有趣，特别是当 PTFE 含量增加时，复合材料的热导率 (TC) 会降低而润滑性会增加。对复合材料的密度、TC 和机械性能进行表征。摩擦测试是通过改变负载、速度和对低碳钢配合面进行的。复合材料显示出非常低的磨损率 (K0 ≈ 10−16 m3/Nm) 和超低摩擦系数 (μ ≈ 0.03)。随着 PTFE 含量的增加，耐磨性和 TC 降低，表明 TC 是控制复合材料磨损的主要参数。使用扫描电子显微镜 (SEM)、能量色散 X 射线分析 (EDAX)、拉曼光谱、XPS（X 射线光电子能谱）和润湿性分析研究磨损表面，以了解磨损机制。