Nanostructured and conventional Cr₂O₃, TiO₂, and TiO₂-Cr₂O₃ thermal-sprayed coatings for metal-seated ball valve applications in hydrometallurgy

From National Research Council Canada

DOIResolve DOI: http://doi.org/10.1007/s11666-016-0405-9
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Name affiliation
  1. National Research Council Canada. Automotive and Surface Transportation
TypeArticle
Journal titleJournal of Thermal Spray Technology
ISSN1059-9630
1544-1016
Volume25
Issue5
Pages1068–1078
SubjectAir plasma spraying; Ceramic coating; Galling; High-pressure acid leaching; Pressure oxidation; Tribomechanical properties
Abstract
A detailed characterization project was undertaken by Velan, an international industrial valve designer and manufacturer, in collaboration with the National Research Council of Canada, Boucherville, and Polytechnique Montréal. The purpose was to assess the mechanical and tribological resistances of promising ceramic coatings for hydrometallurgy applications, including a novel n-TiO₂-Cr₂O₃ blend. Hardness and shear strength were determined using microhardness indentation testers and universal tensile testing equipment. Wear resistance of the coatings under sliding wear, abrasion, and galling conditions were measured by standard pin-on-disk tests, abrasion tests, and custom-designed galling tests. The main result is that the synergy between Cr₂O₃ and n-TiO₂ produced abrasion performance exceeding that of these materials alone. Also, an optimized balance between the hard and brittle Cr₂O₃ phases and the soft and ductile n-TiO₂ phases resulted in higher abrasion, sliding, and galling resistance. The novel n-TiO₂-Cr₂O₃ blend is therefore considered as a promising evolution of the current TiO₂-Cr₂2O₃3 blend.
Publication date
PublisherSpringer International Publishing
PlaceNew York, NY, USA
LanguageEnglish
Peer reviewedYes
Identifier405
NPARC number23000307
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Record created2016-07-06
Record modified2016-07-06
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