Journal
SURFACE & COATINGS TECHNOLOGY
Volume 203, Issue 12, Pages 1649-1655Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2008.12.016
Keywords
In-situ; Plasma spray; In-flight; Reactive; Mechanical alloying
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In the present study, mechanically alloyed Al-12Si, B2O3 and TiO2 powder was deposited onto an aluminum substrate using atmospheric plasma spraying (APS). The effects of mechanical alloying (MA) time and plasma parameters (arc current and primary/secondary/carrier gas flow rate) on in-situ reaction intensity and in-flight particle characteristics (temperature and velocity) have been investigated. It has been observed that MA time has a remarkable effect on powder morphology and relative amount of in-situ formed TiB2 and gamma-Al2O3, Inflight particle diagnostic measurements demonstrate that among the plasma parameters arc current has the strongest effect on in-flight particle velocity and temperature. Also, results indicate that in-flight particle velocity is more dominant than temperature on the relative amount of in-situ formed phases. (C) 2008 Elsevier B.V. All rights reserved.
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