改性生物炭作为聚α-烯烃添加剂的摩擦学性能研究  

A Study on the Tribological Properties of Modified Biochar as Poly Alpha Olefin Additives

作　　者：侯献军[1,2] 张龙翔 王友恒 喻齐凡 江华[1,2] HOU Xianjun;ZHANG Longxiang;WANG Youheng;YU Qifan;JIANG Hua(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan Hubei 430070,China;Hubei Research Center for New Energy&Intelligent Connected Vehicle,Wuhan University of Technology,Wuhan Hubei 430070,China;Chongqing Research Institute of Wuhan University of Technology,Chongqing 401120,China)

机构地区：[1]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070 [2]武汉理工大学,湖北省新能源与智能网联车工程技术研究中心,湖北武汉430070 [3]武汉理工大学重庆研究院,重庆401120

出　　处：《润滑与密封》2024年第8期96-105,共10页Lubrication Engineering

基　　金：国家自然科学基金项目(51875423)。

摘　　要：将在不同温度下热解的棉花秆粉末进行球磨处理与碱化改性后得到纳米生物炭材料,并采用拉曼光谱、傅里叶红外光谱、X射线光电子能谱(XPS)对其进行表征。将纳米生物炭粉末加入聚α-烯烃-6(PAO6)中制备纳米生物炭润滑油,通过粒度分析和自然沉降观测表征其分散稳定性,并考察其润湿性能和摩擦学性能。结果表明:改性处理能提高生物炭含氧官能团的数量从而提升纳米润滑油的润湿性;加入700℃处理的生物炭制成的质量分数0.2%的纳米润滑油性能最佳,与PAO6相比,摩擦因数下降21.2%,磨损量下降43.0%。基于生物炭纳米润滑油理化特性,结合磨损表面XPS分析与形貌分析,将NBC能够改善PAO6摩擦学特性归因于:NBC作为一种薄片状的类二维材料,其中还包括部分极小的颗粒状物质,使其同时发挥层间材料的剪切效应与颗粒材料的填补修复效应;此外,纳米生物炭的添加也可以通过提升润湿性改善局部细缝的摩擦特性,并促进含Fe_(3)O_(4)摩擦膜的形成。The nano-biochar materials were obtained by ball milling and alkali modification of cotton straw powder pyrolyzed at different temperatures,and were characterized by Raman spectroscopy,Fourier infrared spectroscopy,and X-ray photoelectron spectroscopy(XPS).Nano-biochar lubricants were prepared by incorporating nano-biochar powder into poly(α-olefin-6)(PAO6),the dispersion stability was characterized by particle size analysis and natural sedimentation observation,and the wettability and tribological properties were tested.The results show that the number of oxygen-containing functional groups in biochar is increased by modification treatment,thereby enhancing the wettability of nano lubricant.The nano lubricant with 0.2%mass fraction of biochar treated at 700℃has the best performance,and the friction coefficient decreases by 21.2%and the wear amount decreases by 43.0%compared with PAO6.Based on the physicochemical properties of nano-biochar(NBC)lubricating oil and coupled with XPS analysis and morphological analysis of worn surfaces,the improvement of the frictional characteristics of PAO6 attributes to NBC can be ascribed to several factors.NBC,being a sheet-like material akin to a two-dimensional substance,comprising also of some minute particulate matter,concurrently exhibits the shear effects of interlayer materials and the filling and repair effects of particulate materials.Additionally,the incorporation of NBC can enhance the wetting properties,thereby improving the frictional characteristics of local micro-cracks,and facilitate the formation of friction films containing Fe_(3)O_(4).

关 键 词：改性生物炭 聚Α-烯烃 摩擦磨损 摩擦机制 

分 类 号：TH117[机械工程—机械设计及理论]