期刊
SURFACE & COATINGS TECHNOLOGY
卷 205, 期 1, 页码 50-56出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.06.008
关键词
Cold spray; Kinetic metallization; Composite coating; Bond strength; Magnesium alloy
资金
- CAST CRC
- Australian Research Council (ARC) Centre of Excellence for Design in Light Metals
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. Crown Copyright (C) 2010 Published by Elsevier BM. All rights reserved.
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