The influence of ceramic particles on bond strength of cold spray composite coatings on AZ91 alloy substrate

Wang, Qiang, Spencer, Kevin, Birbirlis, Nick and Zhang, Ming-Xing (2010) The influence of ceramic particles on bond strength of cold spray composite coatings on AZ91 alloy substrate. Surface & Coatings Technology, 205 1: 50-56. doi:10.1016/j.surfcoat.2010.06.008

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Author Wang, Qiang
Spencer, Kevin
Birbirlis, Nick
Zhang, Ming-Xing
Title The influence of ceramic particles on bond strength of cold spray composite coatings on AZ91 alloy substrate
Journal name Surface & Coatings Technology   Check publisher's open access policy
ISSN 0257-8972
Publication date 2010-09-25
Sub-type Article (original research)
DOI 10.1016/j.surfcoat.2010.06.008
Volume 205
Issue 1
Start page 50
End page 56
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier
Collection year 2011
Language eng
Formatted abstract
Al–Al2O3 composite coatings were produced on AZ91D magnesium alloy substrates using kinetic metallization (KM), which is a special type of cold spray using a convergent barrel nozzle to attain sonic velocity. The effect of the volume fraction of Al2O3 particles and KM spray temperatures on the microstructure, hardness of the composite coatings, the deposition efficiency, and the bond strength between the coating and substrate was studied. Results show that addition of Al2O3 particles not only significantly improves the density of the coating, but also enhances the deposition efficiency to an optimum value. The bond strength of the composite coatings with the substrate was found to be much stronger than the coating itself, measured using a specially designed lug shear method. Furthermore, based on bond strength data and SEM analysis, higher Al2O3 content resulted in a failure mode transition from adhesive failure to cohesive failure. This is considered a result of a competition between the strengthening of the ceramic reinforcing particles at the coating/substrate interface, and the weakening of coating cohesive strength due to an increase in the proportion of weaker Al–Al2O3 bonds compared with stronger Al–Al bonds. Characterisation of the composite coating in terms of hardness, porosity and microstructure was also conducted.
Keyword Cold spray
Kinetic metallization
Composite coating
Bond strength
Magnesium alloy
Heat treatment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 9 June 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 43 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 52 times in Scopus Article | Citations
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Created: Tue, 16 Nov 2010, 17:28:38 EST by Associate Professor Mingxing Zhang on behalf of School of Mechanical and Mining Engineering