Journal
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
Volume 36, Issue 12, Pages 1346-1363Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01694243.2021.1970396
Keywords
Interface strength; laser shocks; sintered silver; spallation
Funding
- French Government programs 'Investissements d'Avenir' LABEX INTERACTIFS [ANR-11-LABX-0017-01]
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The adhesion of thin silver joints sintered on metallic substrates is a major issue for potential use in power electronics modules. Laser shock-induced spallation provides a method to study this adhesion, and experiments show that aging affects interface strength.
The adhesion of thin silver joints sintered on metallic substrates is a major issue for their potential use in power electronics modules. Here, we explore how laser shock-induced spallation can provide a way to study this adhesion. Due to wave interactions inside the shock-loaded assembly, dynamic tensile stresses are induced near the copper-silver interface, resulting in partial or full removal of the silver layer. In order to investigate the effects of aging on the interface strength, experiments are performed on both as-sintered and aged samples. Time-resolved measurements of the free surface velocity provide information on wave dynamics and interface failure, but finite-element simulations show that inferring a quantitative value of the bonding strength from these data is still challenging. Nevertheless, post-recovery observations provide original insight into the debonding process, including some complex effects of aging, consistent with trends reported in the literature.
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