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A Study of Solder Paste Rheology for The Alternative Assembly and Reflow Technology (AART) Process

Published online by Cambridge University Press:  10 February 2011

S.T. Murthy ,
D. Manessis ,
K. Srihari  and
G.R. Westby
S.T. Murthy
Affiliation:
Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902
D. Manessis
Affiliation:
Surface Mount Technology Laboratory, Universal Instruments Corporation, Binghamton, NY 13902
K. Srihari
Affiliation:
Department of Systems Science and Industrial Engineering, State University of New York at Binghamton, Binghamton, NY 13902
G.R. Westby
Affiliation:
Surface Mount Technology Laboratory, Universal Instruments Corporation, Binghamton, NY 13902
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Abstract

Solder paste performance related properties such as stencil print quality, viscosity, thixotropy, and slump resistance are of great importance in the pre-reflow stages of the electronics assembly process. This paper focuses on the study of the rheological behavior of solder paste and its correlation to process performance during the various steps of the Alternative Assembly and Reflow Technology (AART) process. This technology aims to integrate the Printed Circuit board (PCB) assembly process for both through hole and surface mount components. Four solder pastes were considered in this study and their rheological characteristics were identified through flow and oscillation tests. The oscillation tests provided the linear viscoelastic characteristics of solder paste whereas the flow tests revealed information on the yield stress as well as the degree of shear-thinning and thixotropy of the solder paste. Pastes with high elastic properties and yield stress exhibited good hot slump resistance. Furthermore, extensive shear thinning of the paste facilitated the filling of the Plated-Through-Hole (PTH) sites. Recommendations are provided for tailoring the properties of a solder paste to meet the needs of the AART process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 515: Symposium J – Electronic Packaging Materials Science X , 1998 , 159
Copyright
Copyright © Materials Research Society 1998

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References

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