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Hybrid coupling layers for bulk metallic glass adhesion

Published online by Cambridge University Press:  19 November 2013

Jeffrey Yang  and
Reinhold H. Dauskardt
Jeffrey Yang
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205
Reinhold H. Dauskardt*
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205
*
a)Address all correspondence to this author. e-mail: dauskardt@stanford.edu
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Abstract

Solutions to the technical challenge of bonding and joining bulk metallic glasses have long been sought after due to the exceptional property sets displayed by this class of engineering materials. Here, we demonstrate the ability to deposit a compositionally and functionally graded hybrid coupling layer using sol–gel processing methods to promote adhesion at the metallic glass–epoxy interface. In this study, we fine-tune the molecular composition by varying the sol Zr:Si ratio, altering film properties that consequently influence crack path selection at the interface. When optimized, up to 3-fold improvements in the adhesive/cohesive properties of these structural bond lines can be attained, with the highest GC values correlating with cohesive cracking through the hybrid. We also demonstrate the ability of these hybrid structures to significantly reduce the influence of moisture-assisted degradation as evidenced by reductions in crack growth rates of over two orders of magnitude and increased threshold limits.

Keywords

adhesionsol–gelbonding
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 22 , 28 November 2013 , pp. 3164 - 3169
Copyright
Copyright © Materials Research Society 2013 

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References

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