Mallik, Sabuj, Chan, Erica Hiu Laam and Ekere, Ndy (2012) Nonlinear Viscoelastic Characteristics of Sn-Ag-Cu Solder Pastes Used in Electronics Assembly Applications. Journal of Materials Engineering and Performance, 22 (4). pp. 1186-1193. ISSN 1059-9495 (Print), 1544-1024 (Online) (doi:10.1007/s11665-012-0360-7)

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Abstract

Sn-Ag-Cu solder pastes are widely used as the joining material in the electronic assembly process. The aim of this work was to evaluate the nonlinear viscoelastic behaviors of three different Sn-Ag-Cu solder pastes. Three novel rheological test methods were developed for this purpose. These include viscosity, thixotropic loop, and oscillatory amplitude sweep tests. The nonlinear flow curves obtained from the viscosity tests revealed the “shear-thinning” behavior of solder paste samples. Thixotropic loop test results explain the time-dependent structural breakdown and recovery of solder pastes. The viscoelastic properties of solder pastes were interpreted through oscillatory test parameters: storage modulus (G′), loss modulus (G″), and phase angle (δ). The discrepancies observed in the rheological behaviors of the paste samples were found to be related with flux composition (liquid phase in the solder paste) and particle size distribution.

Item Type:	Article
Uncontrolled Keywords:	nonlinear flow, rheology, suspension, solder paste, viscoelasticity
Subjects:	T Technology > TJ Mechanical engineering and machinery
Pre-2014 Departments:	School of Engineering > Manufacturing Engineering Research Group
Related URLs:	Publisher
Last Modified:	14 Oct 2016 09:23
URI:	http://gala.gre.ac.uk/id/eprint/9490

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