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Title: Electroless Ni-W-P alloys as barrier coatings for liquid solder interconnects
Authors: Chen, Keming
Liu, Changqing
Whalley, David C.
Hutt, David A.
Li, Jianfeng
Mannan, Samjid H.
Issue Date: 2006
Publisher: © IEEE
Citation: CHEN, K. ... et al, 2006. Electroless Ni-W-P alloys as barrier coatings for liquid solder interconnects. IN: Proceedings of the 1st IEEE Electronic Systemintegration Technology Conference, Dresden, 5-7th September 2006, vol. 1, pp. 421-427
Abstract: The control of the interfacial reaction rate is of great importance for liquid solder interconnects for high temperature electronic assemblies. Conventional electroless Ni-P barrier metallizations have been found to be inadequate for providing long term protection of the underlying metallization from the attack of molten solders. In this paper, binary Ni-P was modified with the co-deposition of a refractory alloying element, tungsten (W), from its soluble metal salt added to the plating bath. Critical parameters for the deposition of ternary Ni-W-P were identified. The long term reaction between Ni-W-P and molten Sn-Bi solder at 200 degC was studied. The results indicated that Ni-W-P barrier coatings with higher W contents have much longer service lifetime as a barrier than normal Ni-P coatings. A mechanism for the reaction between Ni-W-P and molten Sn-Bi solder, and a failure mechanism for the Ni-W-P layer, are also proposed
Description: This is a conference paper [© IEEE]. It is also available from: http://ieeexplore.ieee.org/xpl/RecentCon.jsp?punumber=4060679. 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.
Version: Published
DOI: 10.1109/ESTC.2006.280037
URI: https://dspace.lboro.ac.uk/2134/4186
ISBN: 142440553x
Appears in Collections:Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)

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