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Title: Interfacial reaction between molten Sn-Bi based solders and electroless Ni-P coatings for liquid solder interconnects
Authors: Li, Jianfeng
Mannan, Samjid H.
Clode, Mike P.
Chen, Keming
Whalley, David C.
Hutt, David A.
Conway, Paul P.
Keywords: Coatings
High Temperature Electronics
Liquid Solder Interconnects
Scanning Electon Microscopy
Issue Date: 2008
Publisher: © Institute of Electrical and Electronics Engineers (IEEE)
Citation: LI, J. ...et al, 2008. Interfacial reaction between molten Sn-Bi based solders and electroless Ni-P coatings for liquid solder interconnects. transactions on components and packaging technologies, 31 (3), pp. 574 – 585
Abstract: This paper reports on the interfacial reactions and lifetime of electroless Ni-P coatings in contact with molten Sn-Bi based solders. A layer of approximately 4 m thick electroless Ni-P in contact with the molten Sn-58Bi solder began to fail at 48 h at temperatures between 200 C and 240 C. Elemental additions to modify the solder, included 1–2wt.% of Al, Cr, Si, Zn, Ag, Au, Ru, Ti, Pt, Nb, and Cu. Of these, only Cu modified the interfacial intermetallic compound growth from Ni3Sn4 to (Cu,Ni)6Sn5, resulting in significantly decreased consumption rates of the Ni-P substrate in contact with the molten solder and increasing the lifetime of the Ni-P layer to between 430 and 716 h. Micro cracks were observed in all but the thinnest Ni-P layers, allowing the solder to penetrate.
Description: This is a journal article. It was published in the journal IEEE transactions on components, packaging and manufacturing technologies [© IEEE], and is available from: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6144. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
URI: https://dspace.lboro.ac.uk/2134/3790
ISSN: 1521-3331
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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