Investigation of cold spray bonding mechanism focusing on the thin oxide film present in the deposition interface

Yuji Ichikawa, Ryotaro Tokoro, Kazuhiro Ogawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To understand the adhesion mechanism of cold spraying, the characteristics of a newly formed cold spray surface are essential. This surface is formed by the dynamic plastic deformation of the substrate and particles during cold spray impact. Over the surface, the amount of newly generated surface, bonding state, and strength can differ. Even within an individual attached particle, the amount of plastic deformation also differs. To determine the relationship between the coating deposition mechanism, microstructure, and adhesion strength, tensile adhesion strength tests of cold sprayed copper coatings on an aluminum substrate were carried out. Then, using an Auger electron spectroscopic analyzer, the remained oxide film at the fracture surface, which is the bonding interface, was analyzed. The natural oxide film that covers the surface of the substrate before the impact, which is broken by plastic deformation during the spray process. However, the results show that it is not broken at the center of the collision crater, where the amount of plastic deformation of the substrate material is small. Hence, at the center of the collision crater, the oxide film still covers the substrate. Moreover, the results reveal that the adhesion strength is not uniform but is strong at the edge of the crater, where the oxide film has been removed by the colliding particle. These results reveal insights that will be valuable for future improvements in the adhesion strength of cold spray coatings.

Original languageEnglish
Title of host publicationASM International - International Thermal Spray Conference, ITSC 2018
EditorsFardad Azarmi, Timothy Eden, Hua Li, Filofteia-Laura Toma, Kantesh Balani, Tanvir Hussain, Kentaro Shinoda
PublisherASM International
Pages238-241
Number of pages4
ISBN (Electronic)9781510880405
Publication statusPublished - 2018 Jan 1
EventInternational Thermal Spray Conference, ITSC 2018 - Orlando, United States
Duration: 2018 May 72018 May 10

Publication series

NameProceedings of the International Thermal Spray Conference
Volume2018-May

Conference

ConferenceInternational Thermal Spray Conference, ITSC 2018
CountryUnited States
CityOrlando
Period18/5/718/5/10

ASJC Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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