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Tribological Properties of Hard Metal Coatings Sprayed by High-Velocity Air Fuel Process
University West, Department of Engineering Science, Division of Production Engineering. (PTW)ORCID iD: 0000-0002-6929-3310
Fujimi Incoporated.
University of West Bohemia.
University of West Bohemia.
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2016 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, no 1-2, p. 331-345Article in journal (Refereed) Published
Abstract [en]

Lowering the thermal energy and increasing the kinetic energyof hard metal particles sprayed by the newly developed HVAF systems can significantly reduce their decarburization, and increases the sliding wear and corrosion resistance of the resulting coatings, making the HVAF technique attractive, both economically and environmentally, over its HVOF predecessors. Two agglomerated and sintered feedstock powder chemistries, WC-Co (88/12) and WC-CoCr (86/10/4), respectively, with increasing primary carbides grain size from 0.2 to 4.0 microns, have been deposited by the latest HVAF-M3 process onto carbon steel substrates. Their dry sliding wear behaviors and friction coefficients were evaluated at room temperature via Ball-on-disk (ASTM G99-90) wear tests against Al<inf>2</inf>O<inf>3</inf> counterparts, and via Pin-on-disk (ASTM G77-05) wear tests against modified martensitic steel counterparts in both dry and lubricated conditions. Sliding wear mechanisms, with the formation of wavy surface morphology and brittle cracking, are discussed regarding the distribution and size of primary carbides. Corrosion behaviors were evaluated via standard Neutral Salt Spray, Acetic Acid Salt Spray, accelerated corrosion test, and electrochemical polarization test at room temperature. The optimization of the tribological properties of the coatings is discussed, focusing on the suitable selection of primary carbide size for different working load applications. © 2015 ASM International

Place, publisher, year, edition, pages
2016. Vol. 25, no 1-2, p. 331-345
Keywords [en]
Air, Carbides, Carbon, Carbon steel, Ceramic coatings, Corrosion, Corrosion resistance, Friction, Grain size and shape, Hard coatings, HVOF thermal spraying, Kinetics, Martensitic steel, Sintered carbides, Sintering, Tribology, Tungsten carbide, Wear of materials, Wear resistance, Grain size, Hard metals, HVAF, HVOF, Sliding wear, Sprayed coatings
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-8694DOI: 10.1007/s11666-015-0285-4ISI: 000374268000034Scopus ID: 2-s2.0-84953639648OAI: oai:DiVA.org:hv-8694DiVA, id: diva2:875365
Conference
2015 International Thermal Spray Conference, held May 11-14, 2015, in Long Beach, California, USA,
Note

First online: 26 August 2015

Available from: 2015-12-01 Created: 2015-11-24 Last updated: 2017-12-01Bibliographically approved

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Lyphout, Christophe

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