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Title: Study of the microstructure of plasma sprayed coatings obtained from Al{sub 2}O{sub 3}–13TiO{sub 2} nanostructured and conventional powders

The microstructure of coatings obtained from nanostructured or conventional Al{sub 2}O{sub 3}–13TiO{sub 2} powders and deposited by plasma spraying technique on low-carbon steel was examined by transmission electron microscopy techniques. The dominating phase in both coatings was γ-Al{sub 2}O{sub 3} phase. It has been observed that the grains of γ-Al{sub 2}O{sub 3} grew in various shapes and sizes, that are particularly visible in the case of coating sprayed from nanostructured powder. The coatings obtained from the fully melted conventional powders exhibited a typical lamellar microstructure, into which the strips of TiO{sub 2} phase were extended. The microstructure of coatings produced from agglomerates of nanostructured particles also revealed the regions consisting of partially melted α-Al{sub 2}O{sub 3} powders surrounded by the net-like structure formed from fully melted oxides that improved the coating properties. Along with the observed morphology diversity some changes in the chemical composition on the cross sections of obtained coatings have been also noticed. - Highlights: • Plasma sprayed Al{sub 2}O{sub 3}–13TiO{sub 2} coatings reveal diversity of microstructure. • Microstructure of conventional coating was formed from fully melted crushed powders. • Nanostructured coating contains completely and partially melted initial agglomerates.
Authors:
 [1] ;  [2] ;  [1]
  1. Institute of Metallurgy and Materials Science, PAS, Kraków (Poland)
  2. Faculty of Mechatronics and Machine Building, Kielce University of Technology, Kielce (Poland)
Publication Date:
OSTI Identifier:
22403575
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 96; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM OXIDES; CARBON STEELS; CHEMICAL COMPOSITION; MICROSTRUCTURE; MORPHOLOGY; NANOSTRUCTURES; PLASMA; POWDERS; SPRAY COATING; SPRAYED COATINGS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY