氧化石墨烯对GCr15-Si_3N_4摩擦副润滑效应试验

Experimental on Lubrication Effect of Graphene Oxide on GCr15-Si_3N_4 Tribological Pairs

目的研究氧化石墨烯添加剂对GCr15-Si_3N_4摩擦副润滑效应影响,提高陶瓷球轴承的运行特性.方法以GCr15圆盘和Si_3N_4球组成摩擦副,选用40℃时黏度为79.43 mm^2/s的润滑油作为基础油,并添加氧化石墨烯.使用摩擦磨损试验机球面接触式旋转环块考察氧化石墨烯作为润滑油添加剂在GCr15-Si_3N_4摩擦副中的润滑效应;用摩擦磨损试验系统自动记录摩擦系数,温升检测系统实时记录摩擦位置温升,利用电镜对磨痕进行表征;试验分析转速、载荷及氧化石墨烯含量对GCr15-Si_3N_4摩擦副摩擦系数、温升及表面磨痕的影响.结果氧化石墨烯的质量分数为0.15%时对低转速及高载荷有较好的润滑效果;氧化石墨烯的质量分数为0.3%时对高转速的温升有较好的控制作用,温升降低了3.55℃.结论转速、载荷及氧化石墨烯含量对GCr15-Si_3N_4摩擦副的摩擦系数、温升及表面磨痕均有影响.在润滑油中添加适当的氧化石墨烯后可以起到减磨作用,对低转速有较好的润滑效果,对高转速温升有较好的冷却作用.

The effect of graphene oxide additive on the lubrication effect of GCr15-Si3N4 tribological pair was studied to improve the operation characteristics of ceramic ball bearings.GCr15 disc and Si3N4 ball were selected as tribological pair and lubricating oil with viscosity of 79.43 mm2/s at 40℃was selected as base oil.The friction coefficient was automatically recorded by tribometer system,and the temperature rise of the friction position was recorded by the temperature rise detection system.The wear scar was characterized by electron microscopy.The effects of three parameters,including speed,load and graphene oxide content on the friction coefficient,temperature rise and surface wear of GCr15-Si3N4 tribological pair were analyzed.When the quality score of graphene oxide is 0.15%,it has better lubricating effect on low speed and high load.When the quality score of graphene oxide is 0.3%,it has better cooling effect on the temperature rise of high speed,and the temperature rise decreased by 3.55℃.Speed,load and graphene content have an influence on friction coefficient,temperature rise and surface wear scar of GCr15-Si3N4 tribological pair.Adding appropriate graphene oxide in the lubricating oil can reduce surface wear scar,it has a good lubricating effect on the low speed and a better cooling effect on the temperature rise of the high rotational speed.