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Publications (10 of 19) Show all publications
Lyphout, C. & Dizdar, S. (2017). Cavitation-erosion resistance of HVAF-sprayed Fe-based metal coatings for marine applications. In: : . Paper presented at International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017.
Open this publication in new window or tab >>Cavitation-erosion resistance of HVAF-sprayed Fe-based metal coatings for marine applications
2017 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-11968 (URN)
Conference
International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Available from: 2017-12-29 Created: 2017-12-29 Last updated: 2018-08-12Bibliographically approved
Vijay, S., Markocsan, N., Lyphout, C. & Roy, B. (2017). Investigation of wetting properties of ceramic reinforced metal matrixc omposites on varied roughness profiles. In: : . Paper presented at International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017.
Open this publication in new window or tab >>Investigation of wetting properties of ceramic reinforced metal matrixc omposites on varied roughness profiles
2017 (English)Conference paper, Oral presentation only (Other academic)
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-11967 (URN)
Conference
International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Available from: 2017-12-29 Created: 2017-12-29 Last updated: 2018-08-12Bibliographically approved
Vijay, S., Roy, B., Markocsan, N. & Lyphout, C. (2017). Wetting properties of ceramic reinforced metal matrix composites on varied roughness profiles. In: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017): . Paper presented at International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017 (pp. 537-542). New York: Curran Associates, Inc., 1
Open this publication in new window or tab >>Wetting properties of ceramic reinforced metal matrix composites on varied roughness profiles
2017 (English)In: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), New York: Curran Associates, Inc. , 2017, Vol. 1, p. 537-542Conference paper, Published paper (Refereed)
Abstract [en]

Superhydrophobic surfaces are of great importance in many industrial applications, especially where components are exposed to wet environments and low temperatures.Texturing of surfaces to reach superhydrophobicity can be achieved by thermal spraying technology, which is an attractive coating method as it is cheap, flexible and can employ a large range of feedstock materials. In this study, ceramic reinforced metal matrix composite (WC-CoCr) powders were sprayed using High Velocity Air Fuel method. They were varied based on their powder parameters such as carbide grain size, binder grain size and powder strength. The purpose was to investigate their hydrophobic characteristics and how these are influenced by different roughness profiles. The wetting properties such as contact angle and contact angle hysteresis were first investigated for the as-sprayed coatings. The roughness properties and Hausdorff Dimension were then related to the wetting properties. Aside from as-sprayed coatings, the effect of roughness and inherent wetting characteristics were studied by investigating the coating surface after grit blasting and polishing. Results show that powder parameters can lead to designing surfaces with higher surface roughnesses and thus having higher contact angles. It was also shown that surface composition of cermets has an impact on wettability, with the binder accounting for wetting characteristics and carbides accounting for roughness. 

Place, publisher, year, edition, pages
New York: Curran Associates, Inc., 2017
Keywords
Air, Binders, Carbides, Ceramic materials, Ceramic matrix composites, Contact angle, Grain size and shape, Hydrophobicity, Metallic matrix composites, Powder metals, Reinforcement, Sprayed coatings, Surface roughness, Thermal spraying, Contact angle hysteresis, Feedstock materials, Hausdorff dimension, High velocity air fuels, Reinforced metal matrix composites, Super-hydrophobic surfaces, Thermal spraying technology, Wetting characteristics, Wetting
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-13052 (URN)2-s2.0-85047543530 (Scopus ID)9781510858220 (ISBN)
Conference
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017
Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2019-01-10Bibliographically approved
Lyphout, C. (2016). Olika grupper av material med avseende på korrosion, slitage. In: : . Paper presented at Nordisk konferens- termisk sprutning, Trollhättan, Sweden, November 15-16, 2016.
Open this publication in new window or tab >>Olika grupper av material med avseende på korrosion, slitage
2016 (Swedish)Conference paper, Oral presentation only (Other academic)
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-10571 (URN)
Conference
Nordisk konferens- termisk sprutning, Trollhättan, Sweden, November 15-16, 2016
Available from: 2017-01-13 Created: 2017-01-13 Last updated: 2018-08-12Bibliographically approved
Bolelli, G., Berger, L.-M., Börner, T., Koivuluoto, H., Matikainen, V., Lusvarghi, L., . . . Vuoristo, P. (2016). Sliding and abrasive wear behaviour of HVOF- and HVAF-sprayed Cr3C2-NiCr hardmetal coatings. Wear, 358-359, 32-50
Open this publication in new window or tab >>Sliding and abrasive wear behaviour of HVOF- and HVAF-sprayed Cr3C2-NiCr hardmetal coatings
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2016 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 358-359, p. 32-50Article in journal (Refereed) Published
Abstract [en]

This paper provides a comprehensive characterisation of HVOF- and HVAF-sprayed Cr3C2–25 wt.% NiCr hardmetal coatings. One commercial powder composition with two different particle size distributions was processed using five HVOF and HVAF thermal spray systems.All coatings contain less Cr3C2 than the feedstock powder, possibly due to the rebound of some Cr3C2-rich particles during high-velocity impact onto the substrate.Dry sand-rubber wheel abrasive wear testing causes both grooving and pull-out of splat fragments. Mass losses depend on inter- and intra-lamellar cohesion, being higher (≥70 mg after a wear distance of 5904 m) for the coatings deposited with the coarser feedstock powder or with one type of HVAF torch.Sliding wear at room temperature against alumina involves shallower abrasive grooving, small-scale delamination and carbide pull-outs, and it is controlled by intra-lamellar cohesion. The coatings obtained from the fine feedstock powder exhibit the lowest wear rates (≈5x10−6 mm3/(Nm)). At 400 °C, abrasive grooving dominates the sliding wear behaviour; wear rates increase by one order of magnitude but friction coefficients decrease from ≈0.7 to ≈0.5. The thermal expansion coefficient of the coatings (11.08x10−6 °C−1 in the 30–400 °C range) is sufficiently close to that of the steel substrate (14.23x10−6 °C−1) to avoid macro-cracking

Keywords
Abrasion, Abrasives, Adhesion, Alumina, Carbides, Cermets, Coatings, Failure (mechanical), Feedstocks, Friction, Indentation, Particle size, Powder coatings, Rubber testing, Sprayed coatings, Thermal expansion, Wear of materials, Friction coefficients, High temperature, High-velocity impact, Sliding wear, Sliding wear behaviour, Thermal expansion coefficients, Thermal spray coatings, Three body abrasion, HVOF thermal spraying
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-9325 (URN)10.1016/j.wear.2016.03.034 (DOI)000375844800005 ()2-s2.0-84962802963 (Scopus ID)
Available from: 2016-04-25 Created: 2016-04-25 Last updated: 2017-11-30Bibliographically approved
Lyphout, C., Sato, K., Houdkova, S., Smazalova, E., Lusvarghi, L., Bolelli, G. & Sassatelli, P. (2016). Tribological Properties of Hard Metal Coatings Sprayed by High-Velocity Air Fuel Process. Paper presented at 2015 International Thermal Spray Conference, held May 11-14, 2015, in Long Beach, California, USA,. Journal of thermal spray technology (Print), 25(1-2), 331-345
Open this publication in new window or tab >>Tribological Properties of Hard Metal Coatings Sprayed by High-Velocity Air Fuel Process
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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

Keywords
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:nbn:se:hv:diva-8694 (URN)10.1007/s11666-015-0285-4 (DOI)000374268000034 ()2-s2.0-84953639648 (Scopus ID)
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
Clement, C., Sadeghimeresht, E., Lyphout, C., Markocsan, N. & Nylén, P. (2015). Corrosion behavior of HVAF- and HVOF-sprayed high-chromium Fe-based coatings. In: : . Paper presented at 7th Rencontres Internationales sur la Projection Thermique, 9th to 11th December 2015 – Limoges, France.
Open this publication in new window or tab >>Corrosion behavior of HVAF- and HVOF-sprayed high-chromium Fe-based coatings
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2015 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Fe-based coatings with three particular elemental compositions and two different powder particle size were prepared by high-velocity air fuel (HVAF) and high-velocity oxy fuel (HVOF) techniques. The corrosion behavior of which were comparatively studied in 3.5 wt.% NaCl solution. The results indicated that the coatings produced by HVAF process exhibited denser structure with lower porosity. Polarization and electrochemical impedance spectroscopy (EIS) tests indicated that the HVAF coatings provided better corrosion resistance than the HVOF coatings. The presence of defects was significant in HVOF coatings. The investigation illustrated that the corrosion paths initiated and grow through defects of the coating. Furthermore, adding Cr strongly improved the corrosion resistance of the coatings. The results confirmed that the cheap HVAF process could be a potential alternative to HVOF to fabricate Fe-based coatings for industrial applications.

Keywords
Fe-based coatings, corrosion
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-8898 (URN)
Conference
7th Rencontres Internationales sur la Projection Thermique, 9th to 11th December 2015 – Limoges, France
Available from: 2016-01-18 Created: 2016-01-18 Last updated: 2018-08-12Bibliographically approved
Lyphout, C. & Björklund, S. (2015). Internal Diameter HVAF Spraying for Wear and Corrosion Applications. Paper presented at 2014 International Thermal Spray Conference, held May 21-23, 2014, in Barcelona, Spain,. Journal of thermal spray technology (Print), 24(1-2), 235-243
Open this publication in new window or tab >>Internal Diameter HVAF Spraying for Wear and Corrosion Applications
2015 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 24, no 1-2, p. 235-243Article in journal (Refereed) Published
Abstract [en]

Electrolytic hard chrome (EHC) methods are still widely utilized in the printing, automotive and off-shore industries. Alternative methods to EHC have been widely developed in the past decade by conventional HVOF processes and more recently HVAF systems, which are processing at higher kinetic energy and more particularly at lower temperature, significantly increasing wear and corrosion resistance properties. A dedicated internal diameter HVAF system is here presented, and coatings characteristics are compared to the one obtained by standard HVAF coatings. Specially R&D designed fixtures with inside bore of 200 mm have been manufactured for this purpose, with a possibility to spray samples at increasing depth up to 400 mm while simulating closed bottom bore spraying. WC-based and Cr3C2-based powder feedstock materials have been deposited onto high-strength steel substrates. Respective coating microstructures, thermally induced stresses and corrosion resistance are discussed for further optimization of coating performances. The fact that the ID-HVAF system is utilized both for spraying and gritblasting procedures is also given a particular interest.

Keywords
cermet; grit blasting, HVAF, inner diameter HVAF
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-7054 (URN)10.1007/s11666-014-0195-x (DOI)000347416800028 ()
Conference
2014 International Thermal Spray Conference, held May 21-23, 2014, in Barcelona, Spain,
Note

This article is an invited paper selected from presentations at the 2014 International Thermal Spray Conference, held May 21-23, 2014, in Barcelona, Spain, and has been expanded from the original presentation.

Available from: 2014-12-01 Created: 2014-12-01 Last updated: 2018-11-13Bibliographically approved
Lyphout, C., Sato, K., Houdkova, S., Smazalova, E., Lusvarghi, L. & Sassatelli, P. (2015). Tribological Properties of Hard Metal Coatings Sprayed by High Velocity Air Fuel Process. In: International Thermal Spray Conference ITSC 2015: . Paper presented at ITSC 2015, May 11-14, Long Beach Convention Center, Long Beach, California, USA.
Open this publication in new window or tab >>Tribological Properties of Hard Metal Coatings Sprayed by High Velocity Air Fuel Process
Show others...
2015 (English)In: International Thermal Spray Conference ITSC 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

Lowering the thermal energy and increasing the kinetic energy of sprayed particles by newly developed HVAF systems can significantly reduce material decarburization, and increases sliding wear and corrosion resistance of hard metal coatings, making HVAF coatings attractive both economically and environmentally over its HVOFs predecessors. Two agglomerated and sintered feedstock powder chemistries, respectively WC-Co (88/12) and WC-CoCr (86/10/4), 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. Respective dry sliding wear behaviours and friction coefficients were evaluated at room temperature via Ball-on-disk (ASTM G99-90) wear tests against Al2O3 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 formation of wavy surface morphology and brittle cracking, are discussed regarding the distribution and size of primary carbides. Corrosion behaviours were evaluated via standard Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), accelerated corrosion test and electrochemical polarization test at room temperature. Optimization of coating tribological properties are discussed regarding the suitable selection of primary carbide size for different working load applications

Keywords
Coating spray
National Category
Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-9039 (URN)
Conference
ITSC 2015, May 11-14, Long Beach Convention Center, Long Beach, California, USA
Available from: 2016-02-08 Created: 2016-02-08 Last updated: 2018-08-12Bibliographically approved
Bolelli, G., Berger, L.-M. -., Börner, T., Koivuluoto, H., Lusvarghi, L., Lyphout, C., . . . Vuoristo, P. (2015). Tribology of HVOF- and HVAF-sprayed WC-10Co4Cr hardmetal coatings: A comparative assessment. Surface and Coatings Technology, 265, 125-144
Open this publication in new window or tab >>Tribology of HVOF- and HVAF-sprayed WC-10Co4Cr hardmetal coatings: A comparative assessment
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2015 (English)In: Surface and Coatings Technology, ISSN 0257-8972, Vol. 265, p. 125-144Article in journal (Refereed) Published
Abstract [en]

his paper provides a comprehensive assessment of the sliding and abrasive wear behaviour of WC–10Co4Cr hardmetal coatings, representative of the existing state-of-the-art. A commercial feedstock powder with two different particle size distributions was sprayed onto carbon steel substrates using two HVOF and two HVAF spray processes.Mild wear rates of < 10-7 mm3/(Nm) and friction coefficients of ≈ 0.5 were obtained for all samples in ball-on-disk sliding wear tests at room temperature against Al2O3 counterparts. WC–10Co4Cr coatings definitely outperform a reference electrolytic hard chromium coating under these test conditions. Their wear mechanisms include extrusion and removal of the binder matrix, with the formation of a wavy surface morphology, and brittle cracking. The balance of such phenomena is closely related to intra-lamellar features, and rather independent of those properties (e.g. indentation fracture toughness, elastic modulus) which mainly reflect large-scale inter-lamellar cohesion, as quantitatively confirmed by a principal component analysis. Intra-lamellar dissolution of WC into the matrix indeed increases the incidence of brittle cracking, resulting in slightly higher wear rates. At 400 °C, some of the hardmetal coatings fail because of the superposition between tensile residual stresses and thermal expansion mismatch stresses (due to the difference between the thermal expansion coefficients of the steel substrate and of the hardmetal coating). Those which do not fail, on account of lower residual stresses, exhibit higher wear rates than at room temperature, due to oxidation of the WC grains.The resistance of the coatings against abrasive wear, assessed by dry sand–rubber wheel testing, is related to inter-lamellar cohesion, as proven by a principal component analysis of the collected dataset. Therefore, coatings deposited from coarse feedstock powders suffer higher wear loss than those obtained from fine powders, as brittle inter-lamellar detachment is caused by their weaker interparticle cohesion, witnessed by their systematically lower fracture toughness as well.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
WC–10Co4Cr, High velocity oxy-fuel (HVOF), High velocity air-fuel (HVAF), Sliding wear, Abrasive wear
National Category
Metallurgy and Metallic Materials Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-7876 (URN)10.1016/j.surfcoat.2015.01.048 (DOI)2-s2.0-84925299473 (Scopus ID)
Available from: 2015-08-12 Created: 2015-08-12 Last updated: 2019-05-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6929-3310

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