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Influence of hardmetal feedstock powder on the sliding wear and impact resistance of High Velocity Air-Fuel (HVAF)sprayed coatings
RISE - Research Institutes of Sweden, Materials and Production, IVF.
University of Modena and Reggio Emilia, Italy.
University of West Bohemia, Czech Republic.
Fujimi Incorp, Japan.
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2019 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 430-431, p. 340-354Article in journal (Refereed) Published
Abstract [en]

The present work aimed to clarify how the characteristics of WC-CoCr hardmetal feedstock powders, namely the grain size of the WC carbides and of the binder and the compressive strength of the sintered aggregates, affect the dry sliding wear and impact resistance of coatings deposited by High Velocity Air-Fuel (HVAF)spraying. Ball-on-Disc tests, which mimic a sliding wear process in the presence of hard asperities as it may occur e.g. in hydraulic seal joints or papermaking components, resulted in mild wear through near-surface microscale plastic flow, the exact nature of which was significantly affected by WC size. Finite element simulations of a single-asperity sliding process indeed showed that large WC grains concentrate contact stresses, thus undergoing very localised deformation. It is experimentally seen that repeated deformation of the carbide grains resulted in their cracking and pull-out. Uniformly distributed, fine carbides allowed the matrix to take on some stress, thus undergoing more homogeneous plastic flow. Block-on-Ring tests elicited adhesive wear as it may happen e.g. in metal-to-metal contacts (e.g. petrochemical valves). This could be effectively restrained by low matrix mean free path. Cyclic impact resistance of coarse-grained coatings was better than that of fine-grained ones, because of better large-scale cohesive strength.

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 430-431, p. 340-354
Keywords [en]
Cermets, Finite element modelling, Impact wear, Sliding wear, Thermal spray coatings
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-38969DOI: 10.1016/j.wear.2019.05.016Scopus ID: 2-s2.0-85066275915OAI: oai:DiVA.org:ri-38969DiVA, id: diva2:1322314
Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved

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CiteExportLink to record
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