UHMWPE/CB复合材料的耐磨性能和导电性能研究

Wear Resistance and Electrically Conductive Properties of UHMWPE/CB Composites

为了提升抗静电聚合物复合材料在滑动摩擦过程中的耐磨性能,通过高速机械混合和热压成型技术制备超高分子量聚乙烯/导电炭黑(UHMWPE/CB)复合材料,研究CB的含量对UHMWPE/CB复合材料的结构、导电性能、耐磨性能和力学性能的影响。结果表明:CB颗粒均匀分布在UHMWPE基体微区界面之间,形成隔离结构。复合材料的电导率和邵氏硬度随着CB用量的增加均有所提高,摩擦系数随着CB含量的增加而降低。当CB含量增至7%,干滑动摩擦条件(载荷296 N,1 h)下复合材料的磨损质量降至(0.40±0.14)mg,耐磨性能得到改善。复合材料的磨损行为由黏着磨损向磨粒磨损转变。

In order to improve the wear resistance of antistatic polymer composites during sliding friction,ultra high molecular weight polyethylene/conductive carbon black(UHMWPE/CB)composites were prepared by high speed mechanical mixing and hot pressing.The effects of CB content on the structure,electrical conductivity,wear resistance and mechanical properties of UHMWPE/CB composites were studied.The results show that CB particles are uniformly distributed between the interfaces of UHMWPE matrix,forming an isolated structure.The electrical conductivity and Shore hardness of the composites increase with the increasing of CB content,while the friction coefficient decreases.When the CB content is increased to 7%,the wear mass of the composite is decreases to(0.40±0.14)mg under dry sliding friction conditions(load 296 N,1 h),and the wear resistance is improved.The wear behavior of composites changes from adhesive wear to abrasive wear.