氮化硼改性超高分子量聚乙烯的摩擦学性能研究  

Tribological properties of ultrahigh molecular weight polyethylene modified with boron nitride

作　　者：郑兴博 李佳汶 李子辉 韩文娟[2] 蒋晶[3] 王小峰[1] 李倩[1] ZHENG Xingbo;LI Jiawen;LI Zihui;HAN Wenjuan;JIANG Jing;WANG Xiaofeng;LI Qian(National Center for International Research of Micro-Nano Molding Technology,School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学力学与安全工程学院,微纳成型技术国家级国际联合研究中心,郑州450001 [2]郑州大学材料科学与工程学院,郑州450001 [3]郑州大学机械与动力工程学院,郑州450001

出　　处：《中国塑料》2023年第5期28-33,共6页China Plastics

基　　金：国家自然科学基金(U1909219);河南省重点研发计划(221111520200)。

摘　　要：通过高速球磨、热压成型制备超高分子量聚乙烯/氮化硼(PE-UHMW/BN)复合材料,研究了PE-UHMW/BN的硬度、摩擦学性能和力学性能。结果表明,BN的加入可以提高复合材料的屈服强度,但会降低复合材料的拉伸断裂应力和断裂伸长率,BN含量为3%(质量分数,下同)时,BN对PE-UHMW基体的屈服强度的提升效果最明显,同时对基体拉伸应力和断裂伸长率的影响最小;加入BN能明显降低PE-UHMW基体的摩擦系数,PE-UHMW/BN复合材料的摩擦系数随着BN含量的增加而下降,3%的BN对基体润滑性能的提升效果最明显,复合材料的摩擦系数相比纯PE-UHMW下降了60%,在BN含量为7%时润滑效果下降;在PE-UHMW基体中加入不超过3%的BN纳米片可以提高材料表面硬度,进而有效提高材料的抗磨损能力,但添加量为7%时由于团聚效应材料的表面硬度相对下降,材料磨损加剧,耐磨损能力下降。Ultra high molecular weight polyethylene(PE UHMW)/boron nitride(BN)composites were prepared through high-speed ball milling and hot pressing,and their hardness,mechanical properties and tribological properties were investigated.The results indicated that the addition of BN improved the yield strength of the composites but reduced their tensile fracture stress and elongation at break.When the BN loading was 3 wt%,the increasing effect of BN on the yield strength of the composites was most significant,but there was the least effect on the tensile stress and elongation at break.The addition of BN could reduce the friction coefficient of the PE-UHMW matrix significantly,and the friction coefficient of the composites decreased with an increase in the BN content.The composites obtained the most significant effect of BN on the lubricating performance at a loading of 3 wt%,and their friction coefficient decreased by 60%compared to pure PE-UHMW.The lubrication effect decreased at a BN loading of 7 wt%.The addition of no more than 3 wt%BN can improve the surface hardness of PE-UHMW and therefore increases the wear resistance of the composites effectively.However,the surface hardness of the composites decreased with the addition of 7 wt%BN due to an agglomeration effect.As a result,the wear of the composites increased,but their resistance to wear decreased.

关 键 词：超高分子量聚乙烯 氮化硼 硬度 摩擦学性能 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]