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Title: Process and performance modelling for individual ACA conductor particles
Authors: Tao, Junlei
Whalley, David C.
Liu, Changqing
He, J.Y.
Issue Date: 2014
Publisher: © IEEE
Citation: Tao, J., ...et al., 2014. Process and performance modelling for individual ACA conductor particles. Electronics System-Integration Technology Conference (ESTC), 2014, Helsinki, 16-18 Sept, pp. 1 - 6.
Abstract: Flip-chip assembly using anisotropic conductive adhesives (ACAs) has been successfully applied to the achievement of fine pitch electrical interconnections for certain niche applications, particularly flat panel displays. ACAs are an adhesive polymer containing a low volume fraction of conductive particles, which are typically comprised of a polymer core coated with nickel and a thin layer of gold. The properties of these particles are critical to the long term stability of ACA interconnections. However, only limited work has been reported on characterisation of individual particles, and more research is required to gain a complete understanding of their behaviour throughout the range of temperatures and stresses they may experience both during the assembly process and in service. The work presented in this paper utilises finite element analysis (FEA) to compare purely elastic models with models including the viscoelastic behaviour of the particle core. The FEA results show that the viscoelastic characteristics of the polymer core have a significant effect on the stress distribution, deformation and fracture behaviour of the particles. The interface between the Ni coating and polymer particle core is identified as the area where the highest stresses can be potentially induced, thus this area is most vulnerable to crack initiation at high loading rates.
Description: This is a conference paper and is in Closed Access. The definitive published version can be found at: http://dx.doi.org/10.1109/ESTC.2014.6962798
Sponsor: The authors would like to acknowledge the financial support of the UK EPSRC IeMRC, the Research Council of Norway through the PSiCAT BIA project (No. 225962), and the Marie Curie International Research Staff Exchange Scheme (IRSES) Project “Micro-Multi-Material Manufacture to Enable Multifunctional Miniaturised Devices (M6)” (Grant No. PIRSES-GA-2010-269113).
Version: Published
DOI: 10.1109/ESTC.2014.6962798
URI: https://dspace.lboro.ac.uk/2134/18415
Publisher Link: http://dx.doi.org/10.1109/ESTC.2014.6962798
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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