Tribological investigation into nickel-coated graphite polytetrafluoroethylene composites

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Pub Date : 2024-05-23 DOI:10.1177/09544089241255943

YP Deepthi, Santosh Kumar Sahu, D. Anitha, Nakul Gupta, Niranjan dude, Srinivasu Gangi Setti, CD Sandeep

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Abstract

The friction and wear resistance of polytetrafluoroethylene (PTFE) composites can be enhanced by incorporating nickel-coated graphite. An electroless coating method employing Gin plates (418A, 418B) is utilized to produce nickel-coated graphite. X-ray diffractometer analysis reveals the presence of nickel and graphite peaks in the coated graphite powders at 44° and 26.4°, respectively. Scanning electron microscopy images confirm the presence of nickel coating on graphite particles. Tribological tests using a pin-on-disc tribometer (L9) demonstrate that composites filled with 20 wt.% Nickel-coated graphite exhibits the lowest wear rate of 220 µm, compared to 1166 µm for pure PTFE specimens. The notable improvement in wear resistance is attributed to enhanced bonding strength between the filler and matrix material. Pure PTFE exhibits varying coefficient of friction (CoF) at different parameters, with the highest and lowest CoF observed at 200 rpm, 20N and 180 rpm, 10 N, respectively. Optimal parameters for minimizing wear rate and CoF, determined through analysis of means, include a 20 wt.% filler concentration, disc speed of 180 rpm, and 10N load. Analysis of variance identifies composition and speed as primary factors affecting wear and CoF.

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镍涂层石墨聚四氟乙烯复合材料的摩擦学研究

聚四氟乙烯（PTFE）复合材料的耐摩擦性和耐磨性可通过加入镍涂层石墨而得到增强。使用 Gin 板（418A、418B）的无电解涂层法生产镍涂层石墨。X 射线衍射仪分析显示，涂层石墨粉中的镍峰和石墨峰分别为 44°和 26.4°。扫描电子显微镜图像证实石墨颗粒上存在镍涂层。使用针盘摩擦磨损仪（L9）进行的摩擦学测试表明，填充了 20 wt.% 镍涂层石墨的复合材料的磨损率最低，仅为 220 µm，而纯 PTFE 试样的磨损率为 1166 µm。耐磨性的显著提高归功于填料与基体材料之间结合强度的增强。纯聚四氟乙烯在不同参数下表现出不同的摩擦系数（CoF），最高和最低的摩擦系数分别出现在 200 rpm、20N 和 180 rpm、10 N 时。通过均值分析确定的使磨损率和 CoF 最小化的最佳参数包括 20 wt.% 的填料浓度、180 rpm 的圆盘转速和 10 N 的负载。方差分析确定成分和转速是影响磨损和 CoF 的主要因素。

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Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

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