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Publikasjoner (10 av 24) Visa alla publikasjoner
Vijay, S., Wang, L., Lyphout, C., Nylén, P. & Markocsan, N. (2019). Surface characteristics investigation of HVAF sprayed cermet coatings. Applied Surface Science, 493, 956-962
Åpne denne publikasjonen i ny fane eller vindu >>Surface characteristics investigation of HVAF sprayed cermet coatings
Vise andre…
2019 (engelsk)Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 493, s. 956-962Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Superhydrophobic surfaces that are durable and can be easily manufactured are of high interest for many industrial applications. Measuring and understanding roughness in the context of superhydrophobicity is the first step in creation of a surface that does not require activation to be hydrophobic. In this study, the as sprayed surface of different cermet (WC-10Co4Cr and Cr3C2-25Ni20Cr) coatings produced by High Velocity Air Fuel (HVAF) spraying – have been investigated to assess their wetting ability. In order to address the challenges raised by the specific roughness profile of thermal spray surfaces, two routes have been adapted and used for surface characteristics analysis i.e. statistical and fractal. Results show that both methods have a strong correlation to wettability. Roughness parameters Sdq and Sdr show good correlation with advancing contact angle. Hausdorff Dimension of a sub-micrometer profile shows good relation with the contact angle and provides information for state of the droplet. To determine how to increase the contact angle of the coating surface, coating parameters such as CGS Density have been correlated with Hausdorff Dimension. Both methods provide good understanding in terms of wettability of rough cermet surfaces. © 2019 Elsevier B.V.

Emneord
Air; Cermets; Contact angle; Fractals; Hydrophobicity; Sprayed coatings; Statistical methods; Surface roughness, Advancing contact angle; Cermet coatings; Fractal analysis; High velocity air fuels; Hydrophobic surfaces; Roughness parameters; Super-hydrophobic surfaces; Surface characteristics, Wetting
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-14483 (URN)10.1016/j.apsusc.2019.07.079 (DOI)000502007800122 ()2-s2.0-85069570632 (Scopus ID)
Tilgjengelig fra: 2019-10-02 Laget: 2019-10-02 Sist oppdatert: 2020-05-04bibliografisk kontrollert
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.
Åpne denne publikasjonen i ny fane eller vindu >>Cavitation-erosion resistance of HVAF-sprayed Fe-based metal coatings for marine applications
2017 (engelsk)Konferansepaper, Poster (with or without abstract) (Annet vitenskapelig)
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-11968 (URN)
Konferanse
International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Tilgjengelig fra: 2017-12-29 Laget: 2017-12-29 Sist oppdatert: 2018-08-12bibliografisk kontrollert
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.
Åpne denne publikasjonen i ny fane eller vindu >>Investigation of wetting properties of ceramic reinforced metal matrixc omposites on varied roughness profiles
2017 (engelsk)Konferansepaper, Oral presentation only (Annet vitenskapelig)
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-11967 (URN)
Konferanse
International Thermal Spray Conference & Exposition, ITSC 2017, Düsseldorf, Germany, June 7-9, 2017
Tilgjengelig fra: 2017-12-29 Laget: 2017-12-29 Sist oppdatert: 2018-08-12bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Wetting properties of ceramic reinforced metal matrix composites on varied roughness profiles
2017 (engelsk)Inngår i: Proceedings of the International Thermal Spray Conference & Exposition (ITSC 2017), New York: Curran Associates, Inc. , 2017, Vol. 1, s. 537-542Konferansepaper, Publicerat paper (Fagfellevurdert)
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. 

sted, utgiver, år, opplag, sider
New York: Curran Associates, Inc., 2017
Emneord
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
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-13052 (URN)2-s2.0-85047543530 (Scopus ID)9781510858220 (ISBN)
Konferanse
International Thermal Spray Conference and Exposition, ITSC 2017, Dusseldorf, Germany, 7-9 June, 2017
Tilgjengelig fra: 2018-10-29 Laget: 2018-10-29 Sist oppdatert: 2019-01-10bibliografisk kontrollert
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.
Åpne denne publikasjonen i ny fane eller vindu >>Olika grupper av material med avseende på korrosion, slitage
2016 (svensk)Konferansepaper, Oral presentation only (Annet vitenskapelig)
HSV kategori
Forskningsprogram
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-10571 (URN)
Konferanse
Nordisk konferens- termisk sprutning, Trollhättan, Sweden, November 15-16, 2016
Tilgjengelig fra: 2017-01-13 Laget: 2017-01-13 Sist oppdatert: 2018-08-12bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Sliding and abrasive wear behaviour of HVOF- and HVAF-sprayed Cr3C2-NiCr hardmetal coatings
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2016 (engelsk)Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 358-359, s. 32-50Artikkel i tidsskrift (Fagfellevurdert) 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

Emneord
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
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-9325 (URN)10.1016/j.wear.2016.03.034 (DOI)000375844800005 ()2-s2.0-84962802963 (Scopus ID)
Tilgjengelig fra: 2016-04-25 Laget: 2016-04-25 Sist oppdatert: 2017-11-30bibliografisk kontrollert
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, May 11-14, 2015, Long Beach, CA, USA,. Journal of thermal spray technology (Print), 25(1-2), 331-345
Åpne denne publikasjonen i ny fane eller vindu >>Tribological Properties of Hard Metal Coatings Sprayed by High-Velocity Air Fuel Process
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2016 (engelsk)Inngår i: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, nr 1-2, s. 331-345Artikkel i tidsskrift (Fagfellevurdert) 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

Emneord
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
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-8694 (URN)10.1007/s11666-015-0285-4 (DOI)000374268000034 ()2-s2.0-84953639648 (Scopus ID)
Konferanse
2015 International Thermal Spray Conference, May 11-14, 2015, Long Beach, CA, USA,
Merknad

First online: 26 August 2015

Tilgjengelig fra: 2015-12-01 Laget: 2015-11-24 Sist oppdatert: 2020-02-10bibliografisk kontrollert
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.
Åpne denne publikasjonen i ny fane eller vindu >>Corrosion behavior of HVAF- and HVOF-sprayed high-chromium Fe-based coatings
Vise andre…
2015 (engelsk)Konferansepaper, Poster (with or without abstract) (Fagfellevurdert)
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.

Emneord
Fe-based coatings, corrosion
HSV kategori
Forskningsprogram
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-8898 (URN)
Konferanse
7th Rencontres Internationales sur la Projection Thermique, 9th to 11th December 2015 – Limoges, France
Tilgjengelig fra: 2016-01-18 Laget: 2016-01-18 Sist oppdatert: 2019-12-03bibliografisk kontrollert
Lyphout, C., Sato, K., Houdkova, S., Smazalova, E., Lusvarghi, L., Sassatelli, P. & Bolelli, G. (2015). Tribological Properties of Hard Metal Coatings Sprayed by High Velocity Air Fuel Process. In: Proceedings of the International Thermal Spray Conference: . Paper presented at International Thermal Spray Conference and Exposition, ITSC 2015; Long Beach; United States; May 11-14, 2015 (pp. 761-766). ASM International
Åpne denne publikasjonen i ny fane eller vindu >>Tribological Properties of Hard Metal Coatings Sprayed by High Velocity Air Fuel Process
Vise andre…
2015 (engelsk)Inngår i: Proceedings of the International Thermal Spray Conference, ASM International, 2015, s. 761-766Konferansepaper, Publicerat paper (Fagfellevurdert)
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

sted, utgiver, år, opplag, sider
ASM International, 2015
Emneord
Coating spray
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-9039 (URN)2-s2.0-84971350967 (Scopus ID)
Konferanse
International Thermal Spray Conference and Exposition, ITSC 2015; Long Beach; United States; May 11-14, 2015
Tilgjengelig fra: 2016-02-08 Laget: 2016-02-08 Sist oppdatert: 2020-02-10bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Tribology of HVOF- and HVAF-sprayed WC-10Co4Cr hardmetal coatings: A comparative assessment
Vise andre…
2015 (engelsk)Inngår i: Surface and Coatings Technology, ISSN 0257-8972, Vol. 265, s. 125-144Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2015
Emneord
WC–10Co4Cr, High velocity oxy-fuel (HVOF), High velocity air-fuel (HVAF), Sliding wear, Abrasive wear
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-7876 (URN)10.1016/j.surfcoat.2015.01.048 (DOI)2-s2.0-84925299473 (Scopus ID)
Tilgjengelig fra: 2015-08-12 Laget: 2015-08-12 Sist oppdatert: 2019-05-14bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-6929-3310