Impact-bonding with aluminum, silver, and gold microparticles: Toward understanding the role of native oxide layer

Mostafa Hassani-Gangaraj*, David Veysset, Keith A. Nelson, Christopher A. Schuh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Bonding during cold spray has been phenomenologically associated with the breakup of the native surface oxide layer to produce intimate metallic contacts. Here, we resolve the instant of bonding for metals both with and without a significant native oxide, through direct in-situ observation of individual microparticles. We show that fracture of the native oxide layer is not the only physical barrier to impact adhesion; even noble gold must exhibit unstable jetting upon impact in order to attain bonding. However, surface oxide certainly presents an additional barrier to bonding and can increase the critical velocity by a large factor.

Original languageEnglish (US)
Pages (from-to)528-532
Number of pages5
JournalApplied Surface Science
Volume476
DOIs
StatePublished - May 15 2019

Keywords

  • Cold spray
  • Critical velocity
  • Impact-bonding
  • Jetting
  • Surface oxide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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