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    Quantitative evaluation of voids in lead free solder joints.

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    Authors
    Mallik, Sabuj
    Njoku, Jude
    Takyi, Gabriel
    Affiliation
    Unviersity of Derby
    University of Greenwich
    Kwame Nkrumah University
    Issue Date
    2015-07
    
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    Abstract
    Voiding in solder joints poses a serious reliability concern for electronic products. The aim of this research was to quantify the void formation in lead-free solder joints through X-ray inspections. Experiments were designed to investigate how void formation is affected by solder bump size and shape, differences in reflow time and temperature, and differences in solder paste formulation. Four different lead-free solder paste samples were used to produce solder bumps on a number of test boards, using surface mount reflow soldering process. Using an advanced X-ray inspection system void percentages were measured for three different size and shape solder bumps. Results indicate that the voiding in solder joint is strongly influenced by solder bump size and shape, with voids found to have increased when bump size decreased. A longer soaking period during reflow stage has negatively affectedsolder voids. Voiding was also accelerated with smaller solder particles in solder paste.
    Citation
    Mallik, S. et al (2015) 'Quantitative Evaluation of Voids in Lead Free Solder Joints', Applied Mechanics and Materials, 772:284 .
    Publisher
    Trans Tech Publications Inc.
    Journal
    Applied Mechanics and Materials
    URI
    http://hdl.handle.net/10545/622472
    DOI
    10.4028/www.scientific.net/AMM.772.284
    Additional Links
    http://www.scientific.net/AMM.772.284
    Type
    Article
    Language
    en
    ISSN
    16627482
    ae974a485f413a2113503eed53cd6c53
    10.4028/www.scientific.net/AMM.772.284
    Scopus Count
    Collections
    Department of Mechanical Engineering & the Built Environment

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