石墨烯含量对烧结铝材料的组织及性能的影响

Effects of Graphene Content on Microstructure and Properties of Sintered Aluminum Materials

为了给制造出符合特定要求的石墨烯铝产品提供理论依据,采用放电等离子烧结工艺制备成型石墨烯铝材料,借助扫描电镜(SEM)、透射电镜(TEM)、电子万能试验机、导电率测量仪等设备对石墨烯铝材料的微观组织、力学性能和物理性能进行了研究。结果表明:采用超声分散和机械搅拌相结合的方法可使镀镍石墨烯均匀分散在纯铝中;随着镀镍石墨烯的含量从0增加到0.87%(质量分数),石墨烯铝材料的抗拉强度、硬度、导电率和热导率均显著提升;当镀镍石墨烯含量为0.87%时,石墨烯铝材料的抗拉强度达到194 MPa,硬度52 HB,相对于纯铝放电等离子烧结试样分别提高了168%和23%;石墨烯铝材料的导电率达到48.5%IACS,热导率为193.7 W/(K·m)。

In order to provide theoretical basis for manufacturing graphene aluminum products that meent specific conditions,graphene aluminum materials were prepared by spark plasma sintering process.The microstructure,mechanical properties and physical properties of graphene aluminum materials were studied by means of SEM,TEM,electronic universal testing machine,conductivity meter and other equipment.Results showed that the nickel-coated graphene could be uniformly dispersed in pure aluminum by ultrasonic dispersion and mechanical stirring.As the content of nickel-plated graphene increased from 0 to 0.87%(mass fraction),the tensile strength,hardness,conductivity and thermal conductivity of graphene aluminum materials were significantly improved.When the content of nickel-plated graphene was 0.87%,the tensile strength of the graphene aluminum material reached 194 MPa and its hardness was 52 HB,which were 168%and 23%higher than those of the pure aluminum discharge plasma sintered sample,respectively.The conductivity of graphene aluminum material reached 48.5%IACS,and the thermal conductivity was 193.7 W/(K·m).