ORCID Profile
0000-0003-0769-7587
Current Organisation
Beijing Institute of Technology
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Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 2017
Publisher: IEEE
Date: 09-2018
Publisher: Springer Science and Business Media LLC
Date: 04-12-2017
DOI: 10.1038/S41467-017-01727-6
Abstract: While many aspects of electronics manufacturing are controlled with great precision, the nucleation of tin in solder joints is currently left to chance. This leads to a widely varying melt undercooling and different crystal orientations in each joint, which results in a different resistance to electromigration, thermomechanical fatigue, and other failure modes in each joint. Here we identify a family of nucleants for tin, prove their effectiveness using a novel droplet solidification technique, and demonstrate an approach to incorporate the nucleants into solder joints to control the orientation of the tin nucleation event. With this approach, it is possible to change tin nucleation from a stochastic to a deterministic process, and to generate single-crystal joints with their c -axis orientation tailored to best combat a selected failure mode.
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 08-2017
Publisher: Springer Science and Business Media LLC
Date: 18-08-2015
Publisher: Elsevier BV
Date: 03-2019
Publisher: Trans Tech Publications, Ltd.
Date: 05-2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.857.44
Abstract: The solidification of Sn-3Ag-0.5Cu and Sn-0.7Cu-0.05Ni are overviewed and compared. In joints on Cu substrates, both solders begin solidification with primary Cu 6 Sn 5 growing in the bulk liquid prior to tin nucleation. In freestanding balls and joints, SAC305 generally solidifies with a single tin nucleation event and exhibits a mutually-twinned tin grain structure. In contrast, SN100C BGA balls and joints exhibit multiple independent tin grains that grow as a columnar array in joints.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Zhaolong Ma.