Journal
SURFACE & COATINGS TECHNOLOGY
Volume 200, Issue 16-17, Pages 4987-4994Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2005.05.018
Keywords
thermal spraying; HVOF; process optimization; diagnostic; alumina; nanofraction; mechanical properties
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The use of a dense ceramic layer as an environmental bat-Her is often limited due to the differences in coefficient of thermal expansion (CTE) between the coating and steel substrate and poor mechanical strength of the ceramic layer. Nanocrystalline composite materials have been recognized to have special mechanical properties, especially improved fracture toughness in bulk form. In this paper, efforts in transferring the same type of improvements into a thermal spray coating have been made, Development of high velocity oxy-fuel (HVOF) spraying of nanocrystalline Al2O3- and Al2O3-Ni-coatings, where up to ten percent of nickel has been added in order to toughen the coating, is described. Spray parameters were optimized for HV-2000 HVOF spraying system based oil the on-line diagnostics and single splat studies. Parameters were selected aiming at different melting stages of the powder. The resulting microstructure of the coatings and effect of it on the coating properties is discussed. (c) 2005 Elsevier B.V. All rights reserved.
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