Consolidation of Al₂O₃/Al nanocomposite powder by cold spray

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Journal titleJournal of Thermal Spray Technology
Pages275284; # of pages: 10
Subjectaluminum matrix composite; cold spray; nanostructured feedstock
AbstractWhile the improvement in mechanical properties of nanocomposites makes them attractive materials for structural applications, their processing still presents significant challenges. In this article, cold spray was used to consolidate milled Al and Al ₂O ₃/Al nanocomposite powders as well as the initial unmilled and unreinforced Al powder. The microstructure and nanohardness of the feedstock powders as well as those of the resulting coatings were compared. The results show that the large increase in hardness of the Al powder after mechanical milling is preserved after cold spraying. Good quality coating with low porosity is obtained from milled Al. However, the addition of Al ₂O ₃ to the Al powder during milling decreases the powder and coating nanohardness. This lower hardness is attributed to non-optimized milling parameters leading to cracked particles with insufficient Al ₂O ₃ embedding in Al. The coating produced from the milled Al ₂O ₃/Al mixture also showed lower particle cohesion and higher amount of porosity.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number53867
NPARC number18375260
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Record identifier6a8785f4-4f57-475d-814d-e8d2da2a3bb5
Record created2011-08-04
Record modified2016-05-09
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