Journal
SURFACE & COATINGS TECHNOLOGY
Volume 235, Issue -, Pages 424-432Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.07.069
Keywords
Plasma spraying; CPSP; Coating; Nanostructured coatings; Bimodal microstructures
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Air plasma sprayed conventional and nanostructured Al2O3-13 wt.%TiO2, WC-12-17 wt.%Co, and ZrO2-7-8 wt.%Y2O3 coatings were deposited using nitrogen as the primary plasma gas. In nanostructured coatings, as critical plasma spray parameter (CPSP) - which is defined as the ratio of gun or arc power to the primary gas flow rate - controls the volume fraction of unmelted/partially melted regions, which in turn control the properties of coatings, coatings for all systems considered in this work were obtained as a function of CPSP. Coating properties, e.g. porosity, microhardness and percentage of partially melted/unmelted regions, for nanostructured coatings, were seen to be monotonic functions of CPSP. However, the effect of CPSP on percentage of partially melted/unmelted regions was significantly smaller for nitrogen as compared to argon as the primary plasma gas, particularly for nanostructured Al2O3-13 wt.%TiO2 coatings. (C) 2013 Elsevier B.V. All rights reserved.
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