期刊
APPLIED SURFACE SCIENCE
卷 476, 期 -, 页码 528-532出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.01.111
关键词
Impact-bonding; Cold spray; Critical velocity; Jetting; Surface oxide
类别
资金
- U.S. Army Research Laboratory [W911NF-15-2-0034]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0018091]
- U.S. Army Research Office through the Institute for Soldier Nanotechnologies [W911NF-18-2-0048]
- Office of Naval Research DURIP [N00014-13-1-0676]
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.
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