Thakur Anupam, Murtaza Qasim, Ahmed Jahangeer, Choon Kit Chan, Prakash Chander, Khanna Virat, Jasrotia Rohit, Sillanpää Mika, Ramya M, Liu Louis W Y
Department of Mechanical and Automation Engineering, MAIT, Rohini, 110086, Delhi, India.
Department of Mechanical Engineering, Delhi Technological University, New Delhi, 110042, Delhi, India.
Sci Rep. 2024 Oct 7;14(1):23303. doi: 10.1038/s41598-024-73877-9.
The present work focuses on suggesting Gr as a valuable self-lubricating reinforcement for hybrid composite samples and offering a minimum wear rate for sliding pairs with fewer mechanical surface defects at the same time. A series of samples were fabricated using the route by stir casting method considering BC and Gr as the two reinforcements. The morphology of the sample has been studied using the X-ray diffraction graphs, Energy dispersive X-ray analysis and Scanning electron imaging stating the homogeneity of reinforcement in various composite cast. The theoretical and experimental density of the series of samples has been studied and compared stating the low porosity of the samples fabricated. A maximum wear rate (W) of 0.351 × 10 mm/m. was found for pure aluminium sample against EN31 steel disc with 0.053 as friction coefficient (µ). W was somehow seen to reduce up to 0.286 × 10 mm/m for Al-BC composite with µ of 0.48. For hybrid samples, the wear rate was further seen to improve to 0.187 × 10 mm/m for Al-BC and Gr 2.0% weight with µ of 0.38. Least W was found for composite having Gr 3.5% weight, of 0.149 × 10 mm/m. with µ of 0.36. SEM images of the worn surface give evident results for delamination and crack formation on the pin face for the pure-Al sample. Taguchi-ANOVA analysis has been carried out showing the valid contribution of pin type, load and sliding speed on W and friction coefficient as the P-value lies below 0.05 for input parameters considering the 95% confidence level of the model developed. An F-value of 44.57 with R of 0.895 is developed for W model and an F-value of 54.2 with R of 0.934 for the µ model.
目前的工作重点是提出将石墨烯（Gr）作为混合复合材料样品的一种有价值的自润滑增强材料，并同时为具有较少机械表面缺陷的滑动副提供最低磨损率。考虑到硼化碳（BC）和石墨烯作为两种增强材料，采用搅拌铸造法制备了一系列样品。使用X射线衍射图、能量色散X射线分析和扫描电子成像研究了样品的形态，表明各种复合铸件中增强材料的均匀性。研究并比较了该系列样品的理论密度和实验密度，表明所制备样品的孔隙率较低。纯铝样品与EN31钢盘对磨时，最大磨损率（W）为0.351×10⁻³mm/m，摩擦系数（µ）为0.053。对于Al-BC复合材料，µ为0.48时，磨损率在某种程度上降低至0.286×10⁻³mm/m。对于混合样品，Al-BC和2.0%重量的Gr的磨损率进一步提高至0.187×10⁻³mm/m，µ为0.38。发现重量百分比为3.5%的Gr的复合材料磨损率最低，为0.149×10⁻³mm/m，µ为0.36。磨损表面的扫描电子显微镜图像显示了纯铝样品销表面的分层和裂纹形成的明显结果。进行了田口-方差分析，表明销类型、载荷和滑动速度对磨损率和摩擦系数有显著贡献，因为考虑到所建立模型的95%置信水平，输入参数的P值低于0.05。磨损率模型的F值为44.57，R值为0.895，摩擦系数模型的F值为54.2，R值为0.934。
