Abstract
Adhesion strength is often cited as the most important characteristic of cold spray coatings, especially in regard to repair applications. The bonded interface between coating and substrate is complex and calls into play many mechanical and chemical facets. Exploring this phenomenon has been of great interest to the scientific community in recent years. Adhesion research can be separated into two streams; one focuses on the mechanism of metallic bonding and the influence that cold spray parameters have on particle deformation, oxide removal, and the resulting particle/substrate interface. The other stream focuses on characterizing the influence of substrate preparation prior to deposition on adhesion. The experimental observations reported in this chapter are often supported with finite element modeling, as the high strain rates and very short impact times in cold spray processing make it difficult to observe local behavior. This chapter aims to summarize the current state of understanding with respect to the different adhesion mechanisms and the physics involved in the bonding process—with the goal of providing concise information that can be applied to the prediction and improvement of cold spray adhesion strength, particularly for structural repairs and coating applications.
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MacDonald, D., Nastic, A., Jodoin, B. (2018). Understanding Adhesion. In: Cavaliere, P. (eds) Cold-Spray Coatings. Springer, Cham. https://doi.org/10.1007/978-3-319-67183-3_15
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