• 文献标题:   Effect of Embedding Cu-Graphene Hybrid Powder into 2-Phase In-Cu Solders on Its Suitability as Metallic Thermal Interface Material
  • 文献类型:   Article
  • 作  者:   SHARMA D, JAIN A, SOMAIAH N, NARAYANAN PR, KUMAR P
  • 作者关键词:   accumulative roll bonding arb, graphene nanosheet cu hybrid powder, highconductivity material, liquid phase sintering, thermal interface material tim
  • 出版物名称:   JOURNAL OF ELECTRONIC MATERIALS
  • ISSN:   0361-5235 EI 1543-186X
  • 通讯作者地址:   Indian Inst Sci
  • 被引频次:   0
  • DOI:   10.1007/s11664-018-6355-x
  • 出版年:   2018

▎ 摘  要

The effect of embedding Cu-graphene hybrid powder, namely "graphene nano-sheet Cu" (GNS-Cu) powder, into In-40 vol.% Cu solder alloy on the electrical and mechanical properties of In-Cu solder is investigated. GNS-Cu hybrid powders were prepared by mixing reduced graphene oxide powders and CuSO4 center dot 5H(2)O, followed by reduction of the mixture with hydrazine. Subsequently, In-Cu solders with GNS-Cu powders were prepared using a 2-step process, comprising liquid phase sintering (LPS) of In and Cu powders followed by accumulative roll bonding (ARB). During ARB, the GNS-Cu powders were embedded as distinct layers into In-Cu composite solders. Electrical conductivity of the GNS-Cu embedded solders increased by > 20% as compared to pure In-Cu solders processed through the same combination of LPS-ARB steps. The yield strength of In-Cu solder increased by only 10% with the addition of GNS-Cu powders and thus retained the moderate strength often associated with pure In-Cu composite solders. Moreover, the thermal conductivity of GNS-Cu-embedded solders was estimated theoretically to increase by > 60%. These promising findings suggest that GNS-Cu-embedded In-Cu solders can be suitable for next-generation metallic thermal interface material and package-level interconnect applications.