等离子烧结制备防雷接地用石墨烯增强铝材料的组织与性能

Microstructure and Properties of Graphene-reinforced Aluminum Material for Lightning Protection Grounding Prepared by Plasma Sintering

采用超声分散工艺与机械搅拌方法使石墨烯在铝粉中形成均匀混合状态,以放电等离子烧结(SPS)方法获得石墨烯铝材料。采用试验测试手段对其微观组织、力学和物理性能进行分析。结果表明:铝基体中形成了均匀分布状态的石墨烯片,石墨烯铝材料中形成了较多孔隙结构。随着石墨烯量的增加,孔隙结构表现明显。加入石墨烯后,促进了材料力学性能和物理性能的提升。随着石墨烯量增大到1.5vol%,材料抗拉强度增大至212 MPa,相对密度增大至95%,硬度增大至53 HV。试样断口处有大量撕裂脊和凹坑,随石墨烯量增加,撕裂脊和凹坑变得更加的明显。加入少量石墨烯便能够实现试样导电率和热导率的显著提升。当石墨烯达到1.5vol%时,试样的导电率和热导率出现峰值。

Graphene was uniformly mixed in aluminum powder by ultrasonic dispersion process and mechanical stirring method, and graphene aluminum material was obtained by spark plasma sintering(SPS). The microstructure, mechanical and physical properties were analyzed by means of test. The results show that, the graphene sheets with uniform distribution are formed in aluminum matrix and more pore structures are formed in graphene aluminum materials. With the increase of graphene content, the pore structure is obvious. After the addition of the graphene, the mechanical property and the physical property of the material are promoted. With the increase of the amount of the graphene to 1.5 vol%, the tensile strength of the material increases to 212 MPa, the relative density increases to 95%, and the hardness increases to 53 HV. There are a lot of torn ridges and pits at the break of the sample, with the increase of the amount of the graphene, the tear ridges and the pits become more pronounced. The electrical conductivity and thermal conductivity of the samples can be significantly improved by adding a small amount of graphene. When graphene reaches 1.5 vol%, the conductivity and thermal conductivity of the sample have a peak.