Residual Stress Analysis in Curing Process of COG Module

Author:

Wang Liu Bing1,Gao Hong2,Ma Jian1,Chen Xu1

Affiliation:

1. Tianjin University

2. Dalian Jiaotong University

Abstract

In this study, the bonding reliability of the COG devices was studied. A finite element analyses model was established to study the curing process of COG module. The equivalent stress of the different locations of the package structure and the change of the temperature distribution with time were studied. The heat transfer process and the conductive particle deformation process were displayed through the simulation. The results show that the curing process is the heat transformation and particle deformation process. The residual stress generated by the temperature difference between the curing temperature and the operated temperature. The results show that the maximum residual stress is in the most distorted places of the conductive particles. The maximum residual thermal stress was studied with different bump pitch (35μm 30μm 25μm and 20μm) and the size of the particles (5μm, 4μm and 3.5μm). It shows that for a certain size of the particles, the maximum residual thermal stress will decrease when the bump pitch decreases. For a certain bump pitch, the maximum residual thermal stress will decrease when the size of the particles decrease.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference11 articles.

1. J. Zhang and X. Chen: Electronic Components & Materials, Vol. 23 (2004), p.35.

2. K. Qiao and F.Y. Wu: Reliability Analysis and Research, Vol. 11 (2005), p.30.

3. P. Liu: Electronics process technology, Vol. 23 (2002), p.236.

4. X. Chen, J. Zhang, C.L. Jiao: Key Engineering Materials, Vol. 297-300 (2005), p.918.

5. T. Kokogawa, O. Hitoshi, K. Adachi: Effective evaluation of anisotropic conductive film, Proceedings of the 4th International Conference on Adhesive Joining and Coating Technology in Electronics Manufacturing(2000), pp.46-51.

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