Consolidation of Al2O3/Al Nanocomposite Powder by Cold Spray

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Proceedings titleInternational Thermal Spray Conference & Exposition 2010, Thermal Spray: Global Solutions for Future Application (DVS-ASM)
ConferenceInternational Thermal Spray Conference 2010: Singapore, May 3-5, 2010
Pages391397; # of pages: 7
Subjectaluminum matrix composite; cold spray; nano-structured feedstock
AbstractWhile the improvement in mechanical properties of nanocomposites makes them attractive materials for structural applications, their processing still present significant challenges. In this paper, cold spray was used to consolidate Al₂O₃/Al nanocomposite powders obtained from mechanical milling. The microstructure and nanohardness of the feedstock powders as well as of the resulting coatings were analysed. 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 Al₂O₃ to the Al powder during milling decreases the powder nanohardness. This lower hardness is attributed to non-optimised milling parameters for proper Al₂O₃ embedding and dispersion in Al and results in a lower coating hardness compared with the milled Al coating. The coating produced from the milled Al₂O₃/Al mixture also shows lower particle cohesion and higher amount of porosity. The overall results are promising and it is believed that an optimization of Al milling with Al₂O₃ will allow production of sound coatings with improved hardness.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number52433
NPARC number15868894
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Record identifier63087b64-0b56-4344-b58a-0199f45f4dc7
Record created2010-07-30
Record modified2016-05-09
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