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TECHNICAL BRIEF

In Situ Evaluation of Residual Stresses in an Organic Die-Attach Adhesive

[+] Author and Article Information
A. S. Voloshin, P.-H. Tsao

Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015

R. A. Pearson

Department of Material Science and Engineering, Lehigh University, Bethlehem, PA 18015

J. Electron. Packag 120(3), 314-318 (Sep 01, 1998) (5 pages) doi:10.1115/1.2792639 History: Received August 07, 1997; Revised January 29, 1998; Online December 05, 2007

Abstract

Development of the residual stresses in an organic adhesive, alumina filled epoxy (EPO-TEK H65-175MP) during curing process has been studied in-situ. The effect of the adhesive’s thickness was evaluated by preparing samples and analyzing residual stresses. Samples were prepared by applying a layer of the epoxy in various thicknesses on the back side of the silicon die. The topology changes of the die’s surface during curing process and cooling of the epoxy were monitored by digital image analysis enhanced moiré interferometry (DIAEMI). Residual stresses were calculated from the curvature changes of the surface of the die. The results show that the stress buildup is mainly caused by the mismatch in coefficient of thermal expansion between the adhesive and the die. Relaxation of the residual stress was found while the samples were kept in an open environment at room temperature. Such reduction in stress may be attributed to moisture absorption by the epoxy that results in expansion of the epoxy.

Copyright © 1998 by The American Society of Mechanical Engineers
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