摘要
以石墨烯和正硅酸乙酯为原料用溶胶-凝胶法制备了Graphene/SiO_(2)纳米复合材料,用球盘式摩擦磨损试验机评价其作为水基润滑添加剂在不同载荷和浓度下的摩擦学性能。用扫描电镜(SEM)、X射线光电子能谱(XPS)等手段表征了摩擦副的表面形貌和元素特征。结果表明:在15N载荷工况下,Graphene/SiO_(2)纳米复合材料作为添加剂在超纯水中含量为0.2%(质量分数)时具有最佳的摩擦学性能,比超纯水的摩擦系数降低了17.9%,钢球磨损率降低了61.7%。基于磨损表面分析提出的润滑机制为:在摩擦过程中,Graphene/SiO_(2)纳米复合材料在磨损表面生成的物理吸附膜、Graphene的层状剪切作用以及SiO_(2)在磨损表面的修复作用和滚珠轴承作用,使超纯水的摩擦学性能提高。
Graphene/SiO_(2)nanocomposites were prepared by sol-gel method using graphene and Tetraethyl orthosilicate as raw materials.The tribological properties of graphene/SiO_(2)nanocomposites as water-based lubrication additives were evaluated by ball-disk friction and wear testing machine under different loads and in the presence of ultra-pure waters with different additive concentrations.The surface morphology and elemental characteristics of the friction pair were analyzed by scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).The results show that under the loading condition of 15N,in ultra-pure water with 0.2%(mass fraction)Graphene/SiO_(2)nanocomposites as additives the ball-disk pair exhibits the best tribological properties,with the coefficient of friction and the wear rate of the steel ball 17.9%and 61.7%lower,respectively than those in the blank ultra-pure water.Based on the wear surface analysis,the lubrication mechanism is as follows:during the friction process,the physical adsorption film formed by graphene/SiO_(2)nanocomposites on the wear surface,the layered shear action of graphene,the repair action of SiO_(2)on the wear surface,and the action of ball bearings.All together effectively improve the tribological properties of ultra-pure water.
作者
王伟
解泽磊
屈怡珅
常文娟
彭怡晴
金杰
王快社
WANG Wei;XIE Zelei;QU Yishen;CHANG Wenjuan;PENG Yiqing;JIN Jie;WANG Kuaishe(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Economics and Management,Beijing Jiaotong University,Beijing 100044,China;School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2023年第7期543-553,共11页
Chinese Journal of Materials Research
基金
国家自然科学基金(51975450)。
