摘要
以不同质量分数(0.0%,0.3%,0.6%和0.9%)的石墨烯为增强相,采用真空热压工艺制备出石墨烯铝基复合材料,深入研究了Al-20Si-0.3Mg、Al-20Si-0.3Mg-0.3GNPs、Al-20Si-0.3Mg-0.6GNPs和Al-20Si-0.3Mg-0.9GNPs试样的物相结构、微观形貌、力学性能和耐磨性能。结果表明,石墨烯的掺杂并未在铝基复合材料中生成新的产物,晶体结构未发生变化,适量石墨烯的掺杂细化了初晶硅的尺寸,使针状的共晶硅数量减少,整体分布更均匀。适量石墨烯的掺杂显著改善了复合材料的力学性能和耐磨性能,随着石墨烯掺杂量的增加,复合材料的维氏硬度、拉伸强度、断裂延伸率和弹性模量均先增大后降低,摩擦系数先降低后增大。当石墨烯的掺杂量为0.6%(质量分数)时,Al-20Si-0.3Mg-0.6GNPs试样的维氏硬度、拉伸强度、断裂延伸率和弹性模量达到最大值,摩擦系数达到最小值,分别为126.4 HV、262.4 MPa、6.25%、135.8 GPa和0.09,具有优异的力学性能和耐磨性能。综合分析可知,石墨烯的最佳掺杂量为0.6%(质量分数)。
Graphene reinforced Al matrix composites were prepared using vacuum hot pressing technology with graphene of different mass fractions(0.0%,0.3%,0.6%,and 0.9%)as the reinforcing phase.The phase structure,microstructure,mechanical properties and wear resistance of Al-20Si-0.3Mg,Al-20Si-0.3Mg-0.3GNPs,Al-20Si-0.3Mg-0.6GNPs and Al-20Si-0.3Mg-0.9GNPs samples were thoroughly studied.The results showed that the doping of graphene didn’t generate new products in the Al matrix composites,and the crystal structure didn’t change.The appropriate doping of graphene refined the size of primary silicon,reduced the number of needle shaped eutectic silicon,and made the overall distribution more uniform.The moderate doping of graphene significantly improved the mechanical and wear resistance of the composites.With the increase of graphene doping,the Vickers hardness,tensile strength,fracture elongation and elastic modulus of the composites first increased and then decreased,and the friction coefficient first decreased and then increased.When the doping amount of graphene was 0.6wt%,the Vickers hardness,tensile strength,fracture elongation and elastic modulus of the Al-20Si-0.3Mg-0.6GNPs sample reached their maximum values,and the friction coefficient reached its minimum value,which were 126.4 HV,262.4 MPa,6.25%,135.8 GPa and 0.09,respectively.It had excellent mechanical properties and wear resistance.According to comprehensive analysis,the optimal doping amount of graphene was 0.6wt%.
作者
徐纪珂
李想
XU Jike;LI Xiang(Department of Sports,Kaifeng University,Kaifeng 475001,China;School of Environment,Henan Normal University,Xinxiang 453007,China)
出处
《功能材料》
北大核心
2025年第8期8193-8198,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(21705034)。
关键词
石墨烯
铝基
复合材料
力学性能
耐磨性能
graphene
Al matrix
composites
mechanical properties
wear resistance
作者简介
徐纪珂(1979—),男,副教授,主要从事体育器材研究。;通讯作者:李想,E-mail:XLi2011@163.com。
