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: https://doi.org/10.1007/s11666-016-0405-9
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Name affiliation
  1. National Research Council Canada. Automotive and Surface Transportation
FormatText
TypeArticle
Journal titleJournal of Thermal Spray Technology
ISSN1059-9630
1544-1016
Volume25
Issue25
Subjectair plasma spraying (APS); ceramic coating; galling; high-pressure acid leaching (HPAL); pressure oxidation (POx); 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-Cr2O3 blend.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NRC numberNRC-AST-BOU-0005
NPARC number21277543
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Record created2016-04-18
Record modified2020-03-16
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