Computational Physics GroupKarel Matous |
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Microstructure Statistics--Property Relations of Silver Particle--Based Interconnects
O. van der Sluis2,3, and M.P.F.H.L. van Maris2 1Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA. 2Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands. 3Philips Research Laboratories, High Tech Campus 4, 5656 AE, Eindhoven, The Netherlands. Abstract
This paper presents a novel approach for
establishing microstructure statistics-property
relations for a silver particle-based thermal
interface material (TIM). Several sintered silver TIMs
have been prepared under different processing
conditions, generating samples with distinct
microstructures. The 3D microstructure is revealed and
visualized using the combination of Focused Ion Beam
(FIB) milling and Scanning Electron Microscopy (SEM)
imaging. Representative synthetic model
microstructures have been generated based on Gaussian
random field models, having well defined analytical
description. The statistical characteristics of the
samples and the synthetic models are shown to have a
good correspondence, indicating that the linear
effective properties of these complex materials can be
predicted based on analytical estimates available for
the synthetic models. This is verified by computing
the effective elastic and thermal material properties
using the computational homogenization approach based
on the finite element models of the real samples. The
computational homogenization, providing the reference
solution, and the higher-order statistical estimates
for the synthetic models are in very good agreement.
These results can be used in the development of new
silver particle-based materials, whereby the expensive
and time consuming effective material property
characterization can be replaced by efficient
estimation based on the synthetic random field models.
Conclusions
In this paper, a
methodology for establishing microstructure
statistics-property relations has been presented and
applied to a sintered silver particle-based interconnect
material for high power electronic applications. The
novel original feature of this approach is the
combination of the statistical morphological measures of
real and synthetic microstructures with the higher order
statistical micromechanics and direct finite element
computational homogenization. The main steps and
conclusions of this contribution can be summarized as
follows.
Acknowledgment The authors are grateful to Dr.
Sebastian Fritzsche from Heraeus for providing the
materials for this study. This work was partially
supported by the NANOTHERM project co-funded by the
European Commission under the "Information and
Communication Technologies", Seven Framework Program,
Grant Agreement No 318117.
Download paper here.
© 2017 Notre
Dame and Dr. Karel Matous
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