磺化石墨烯与纳米氧化铝改性聚甲醛复合材料的导热及摩擦学性能研究  

Thermal Conductivity and Tribological Properties of POM Composites Filled with Sulfonated Graphene and Nano Alumina

作　　者：董佩冉 龙春光[1] 刘思佳 彭鑫 彭鹰 DONG Pei-ran;LONG Chun-guang;LIU Si-jia;PENG Xin;PENG Ying(Institute of Lightweight New Materials,Changsha University of Science and Technology,Changsha 410004,China)

机构地区：[1]长沙理工大学轻量化新材料所,长沙410004

出　　处：《表面技术》2018年第10期116-122,共7页Surface Technology

基　　金：国家科技部国际合作专项基金(0102013DFG52800);湖南省自然科学基金(2018JJ2426)~~

摘　　要：目的探究纳米氧化铝(αAl_2O_3)和磺化石墨烯(S-GNS)对聚甲醛(POM)复合材料导热性能和摩擦学性能的影响,分析两种填料的协同改性机理。方法以S-GNS、αAl_2O_3和POM为原料,通过静电自组装法制备S-GNS-αAl_2O_3复合体,采用模压成型法制备S-GNS-αAl_2O_3/POM复合材料。采用X射线衍射仪、红外光谱仪及扫描电子显微镜对S-GNS和S-GNS-αAl_2O_3复合体进行表征,并采用导热系数测试仪和摩擦磨损试验机对复合材料的导热系数、摩擦系数和磨损量进行测试。利用扫描电子显微镜观察复合材料的磨损表面形貌。结果αAl_2O_3和S-GNS协同改性能够有效改善POM的导热性能,当S-GNS-αAl_2O_3复合体含量为7%(质量分数,下同)时,S-GNS-αAl_2O_3/POM复合材料导热系数为0.2524 W/(m·K),比纯POM提高了25.3%,S-GNS起到传递热量和提高αAl_2O_3与POM界面相容性的作用。S-GNS的加入,提高了S-GNS-αAl_2O_3/POM复合材料的热稳定性,有效地减少了αAl_2O_3磨粒对基体的损伤;αAl_2O_3的加入则分担了载荷,提高了复合材料的耐磨性。随着S-GNS-αAl_2O_3复合体含量的增加,S-GNS-αAl_2O_3/POM复合材料的摩擦系数逐渐降低,磨损量也呈降低趋势,且磨损表面光滑,磨损机理为磨粒磨损和轻微的犁沟切削。结论S-GNS和αAl_2O_3在POM中能发挥协同作用,有效提高了POM复合材料的导热性能和摩擦学性能。The work aims to explore effects of nano alumina(αAl2O3)and sulfonated graphene(S-GNS)on thermal conductivity and tribological properties of polyoxymethylene(POM)composites and analyze the synergistic modification mechanism ofαAl2O3 and S-GNS.S-GNS,αAl2O3 and POM were used as raw materials to prepare S-GNS-αAl2O3 complex by electrostatic self-assembly method,as well as S-GNS-αAl2O3/POM composites by compression molding.The S-GNS and S-GNS-αAl2O3 complexes were characterized by XRD,FT-IR and SEM.At the same time,the thermal conductivity,friction coefficient and wear loss of composites were tested by friction and wear tester and thermal conductivity tester.The worn surface morphology of the composites was observed by SEM.The synergistic modification ofαAl2O3 and S-GNS could effectively improve the thermal conductivity of composites.When the content of S-GNS-αAl2O3 was 7%(mass fraction,the same below),the thermal conductivity of the composite was 0.2524 W/(m·K),which was 25.3%higher than that of pure POM.S-GNS played the role in transferring heat and improving the compatibility of interface betweenαAl2O3 and POM.The addition of S-GNS improved the thermal stability of S-GNS-αAl2O3/POM composite and effectively reduced the damage to the matrix byαAl2O3 abrasive particles.Meanwhile,the addition ofαAl2O3 shared the load and improved wear resistance of composites.With the increase of S-GNS-αAl2O3 content,the friction coefficient of S-GNS-αAl2O3/POM composite decreased gradually and the wear amount also decreased.Furthermore,the worn surface was very smooth,and the wear mechanism was abrasive wear and slight furrow cutting.S-GNS andαAl2O3 can play a synergistic role in POM composites,and effectively improve the thermal conductivity and tribological properties of POM composites.

关 键 词：S-GNS-αAl2O3复合体 POM 导热性能 摩擦学性能 协同改性 磨损机制 

分 类 号：TB332[一般工业技术—材料科学与工程] TH117[机械工程—机械设计及理论]