Volume 7, Issue 9 (October 2010)

    Wetting Behaviour and Evolution of Microstructure of Sn–Ag–Zn Solders on Copper Substrates with Different Surface Textures

    (Received 25 February 2010; accepted 31 July 2010)

    Published Online: 2010

    CODEN: JAIOAD

      Format Pages Price  
    PDF Version 17 $25   ADD TO CART


    Abstract

    The effect of surface roughness on wetting behaviour and evolution of microstructure of two lead-free solders (Sn-2.625Ag-2.25Zn and Sn-1.75Ag-4.5Zn) on copper substrate was investigated. Both solders exhibited good wettability on copper substrates having rough surface and lower wettabilty on smooth surfaces. The contact angles of solders decreased linearly with increase in surface roughness of the substrate. The exponential power law, ϕ=exp(−Kτn), was used to model the relaxation behaviour of solders. A high intermetallic growth was observed at the interface particularly on copper substrates with rough surface texture. A thin continuous interface showing scallop intermetallic compounds (IMC) was obtained on smooth surfaces. With an increase in surface roughness, the IMC morphology changed from scallop shaped to needle type at the Sn-2.625Ag-2.25Zn solder/substrate interface and nodular to plate like IMCs for Sn-1.75Ag-4.5Zn solder matrix.


    Author Information:

    , Satyanarayan
    Dept. of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Srinivasnagar,

    Prabhu, K. Narayan
    Dept. of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Srinivasnagar,


    Stock #: JAI103052

    ISSN: 1546-962X

    DOI: 10.1520/JAI103052

    ASTM International is a member of CrossRef.

    Author
    Title Wetting Behaviour and Evolution of Microstructure of Sn–Ag–Zn Solders on Copper Substrates with Different Surface Textures
    Symposium , 0000-00-00
    Committee F01