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Mulone, A., Mahade, S., Björklund, S., Lundström, D., Kjellman, B., Joshi, S. V. & Klement, U. (2023). Development of yttria-stabilized zirconia and graphene coatings obtained by suspension plasma spraying: Thermal stability and influence on mechanical properties. Ceramics International, 49(6), 9000-9009
Öppna denna publikation i ny flik eller fönster >>Development of yttria-stabilized zirconia and graphene coatings obtained by suspension plasma spraying: Thermal stability and influence on mechanical properties
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2023 (Engelska)Ingår i: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 49, nr 6, s. 9000-9009Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This study investigated the feasibility of depositing graphene nanoplatelet (GNP)-reinforced yttria-stabilized zirconia (YSZ) composite coatings. The coatings were deposited from an ethanol-based mixed YSZ and GNP suspension using suspension plasma spraying (SPS). Raman spectroscopy confirmed the presence of GNPs in the YSZ matrix, and scanning electron microscopy (SEM) analysis revealed a desired columnar microstructure with GNPs distributed predominantly in the inter-columnar spacing of the YSZ matrix. The as-deposited YSZ-GNP coatings were subjected to different isothermal treatments—400, 500, and 600 °C for 8 h—to study the thermal stability of the GNPs in the composite coatings. Raman analysis showed the retention of GNPs in specimens exposed to temperatures up to 500 °C, although the defect concentration in the graphitic structure increased with increasing temperature. Only a marginal effect on the mechanical properties (i.e., hardness and fracture toughness) was observed for the isothermally treated coatings. 

Ort, förlag, år, upplaga, sidor
Elsevier, 2023
Nyckelord
Composite coatings; Fracture toughness; Graphene; Isotherms; Plasma jets; Plasma spraying; Plasma stability; Scanning electron microscopy; Thermodynamic stability; Yttria stabilized zirconia; Yttrium oxide; Electron microscopy analysis; Graphene coatings; Graphene nanoplatelets; Raman; Suspension plasma spraying; Suspension plasma sprays; Yttria stabilized zirconia coatings; Yttria-stabilized-zirconia; Zirconia composite coatings; Zirconia matrix; Microstructure
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-19433 (URN)10.1016/j.ceramint.2022.11.055 (DOI)000965427300001 ()2-s2.0-85141532957 (Scopus ID)
Anmärkning

This is an open access article under the CC BY 4.0 license.

The authors would like to acknowledge the national Strategic Innovation Programme for graphene, SIO Grafen, for the financial support received. The programme is supported by the Swedish government agencies Vinnova (Sweden’s Innovation Agency), the Swedish Energy Agency and the Swedish Research Council Formas. The project grant nr.Is Dnr 2018–03315

Tillgänglig från: 2023-01-23 Skapad: 2023-01-23 Senast uppdaterad: 2024-01-05Bibliografiskt granskad
Fefekos, A. G., Gupta, M. K., Mahade, S., Björklund, S. & Joshi, S. V. (2023). Effect of spray angle and substrate material on formation mechanisms and properties of HVAF sprayed coatings. Surface & Coatings Technology, 452, Article ID 129115.
Öppna denna publikation i ny flik eller fönster >>Effect of spray angle and substrate material on formation mechanisms and properties of HVAF sprayed coatings
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2023 (Engelska)Ingår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 452, artikel-id 129115Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Thermally sprayed coatings are often used to enhance the surface properties (wear resistance, corrosion resistance, etc.) of engineering components in order to extend their performance and service lifetime. Typically, the industrial components to be coated possess complex geometries and are fabricated using different materials, which can influence the deposited coating’s microstructure and performance. High-velocity air fuel (HVAF) process is a relatively new thermal spray processing technique that has shown tremendous potential to deposit high performance coatings for durable industrial components. However, no detailed studies have been reported on HVAF sprayed coating formation mechanisms so far in relation to the spray angle and substrate properties, and the influence of coating material on the above. The objective of this work was to study the influence of spray angles and substrate materials on splat characteristics, coating microstructure evolution, properties and performance for two distinct coating materials. In this study, one cermet (WC-CoCr) and one metallic (Inconel 625) feedstock were deposited onto three different substrates (aluminium alloy, carbon steel and Hastelloy-X) utilising different spray angles (40°, 60° and 90°). The coating evolution was analysed utilising SEM/EDS, image analysis, and micro-indentation. To determine the tribological performance, coatings were subjected to dry sliding wear test utilising alumina ball as counter surface and specific wear rates were obtained. The results showed that initial splat characteristics were substantially altered on changing the substrate and the spray angle. However, the final coating properties were not affected significantly even though the deposition rate was reduced significantly at lower spray angle, suggesting the versatility of the HVAF process. 

Ort, förlag, år, upplaga, sidor
Elsevier, 2023
Nyckelord
Air; Alumina; Coated materials; Corrosion resistance; Corrosion resistant coatings; Deposition rates; Metal substrates; Microstructure; Sprayed coatings; Tribology; Wear of materials; Wear resistance; Coating formation; Dry sliding wear; Dry sliding wear testing; Formation mechanism; High velocity air fuel spraying; High velocity air fuels; Splat characteristic; Spray angle; Substrate material; Wear-testing; Aluminum oxide
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-19503 (URN)10.1016/j.surfcoat.2022.129115 (DOI)000898604200003 ()2-s2.0-85143850042 (Scopus ID)
Forskningsfinansiär
KK-stiftelsen, 20170198
Anmärkning

CC-BY 4.0

Tillgänglig från: 2022-12-29 Skapad: 2022-12-29 Senast uppdaterad: 2024-04-12
Mi, Y., Mahade, S., Sikström, F., Choquet, I., Joshi, S. V. & Ancona, A. (2022). Conduction mode laser welding with beam shaping using a deformable mirror. Optics and Laser Technology, 148
Öppna denna publikation i ny flik eller fönster >>Conduction mode laser welding with beam shaping using a deformable mirror
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2022 (Engelska)Ingår i: Optics and Laser Technology, ISSN 0030-3992, E-ISSN 1879-2545, Vol. 148Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This study explores the possibility of tailoring the fusion zone in conduction mode laser welding using a deformable mirror for beam shaping of multi-kilowatt continuous wave laser sources. Three power density distributions were shaped and used in bead on plate welding of Ti64 plates in conduction mode at three travel speeds. The effect on melt pool free surface geometry, cross section, microstructure and hardness profiles was measured and studied. It is shown that the geometry of the melt pool can be modified using a deformable mirror. A narrower and longer melt pool or a wider, shorter and shallower one were indeed obtained forming Gaussian-elliptical power density distributions oriented along and transverse to the travel direction, respectively. The latter distribution could be a favourable option for laser beam additive manufacturing as it could improve process efficiency while reducing remelting of the previous layer. This system has also a promising potential for adaptive process control since it could change fundamentally the beam shape at a rate faster than 10 ms. 

Ort, förlag, år, upplaga, sidor
Elsevier Ltd, 2022
Nyckelord
Adaptive control systems; Continuous wave lasers; Deformation; Gaussian beams; Lakes; Laser beam welding; Laser beams; Laser mirrors; Microstructure, Beam-shaping; Conduction mode; Conduction mode laser welding; Conduction mode welding; Deformable mirrors; Fusion zone geometry; Fusion zones; Melt pool; Melt pool geometry; Power density distributions, Geometry
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17945 (URN)10.1016/j.optlastec.2021.107718 (DOI)000788245300001 ()2-s2.0-85120819958 (Scopus ID)
Forskningsfinansiär
KK-stiftelsen, 20170315
Tillgänglig från: 2022-03-07 Skapad: 2022-03-07 Senast uppdaterad: 2024-04-12
Curry, N., Mahade, S., Venkat, A. & Joshi, S. V. (2022). Erosion performance of suspension plasma spray thermal barrier coatings: A comparison with state of art coatings. Surface & Coatings Technology, 437, Article ID 128311.
Öppna denna publikation i ny flik eller fönster >>Erosion performance of suspension plasma spray thermal barrier coatings: A comparison with state of art coatings
2022 (Engelska)Ingår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 437, artikel-id 128311Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Suspension plasma spray (SPS) thermal barrier coatings are currently at an early stage of industrial adoption. There remain questions about the performance of SPS columnar coatings under different engine environmental conditions as it may influence which established engine coatings can be replaced by SPS coatings. One particular area of concern has been the erosion resistance of SPS coatings.In this study a columnar SPS coating has been evaluated against three types of state of art air plasma spray coatings: conventional porous coating, high porosity coating and dense vertically cracked coating. Air-jet erosion testing was performed on coatings at a glancing angle of 30 degrees and with direct impact at 90 degrees. Coatings have been ranked according to their mass loss per unit erodent mass. Coatings were also evaluated for their microstructure, porosity content, hardness, and fracture toughness. The erosion damage created during testing has also been investigated using electron microscopy to observe the damage mechanism. The results of this study demonstrate that SPS coatings can outperform porous APS coatings in erosion resistance and could be considered a match for dense vertically cracked coatings. The SPS columnar coatings have shown a decreasing erosion rate with exposure time that suggest the influence of surface roughness on initial erosion behaviour.

Ort, förlag, år, upplaga, sidor
Elsevier, 2022
Nyckelord
Thermal barrier coating; Air plasma spray; Suspension plasma spray; Erosion; Porosity; YSZ
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-18377 (URN)10.1016/j.surfcoat.2022.128311 (DOI)000779412500004 ()2-s2.0-85126093827 (Scopus ID)
Tillgänglig från: 2022-09-26 Skapad: 2022-09-26 Senast uppdaterad: 2022-09-26Bibliografiskt granskad
Mahade, S., Awe, S. A., Björklund, S., Lukáč, F., Mušálek, R. & Joshi, S. V. (2022). Sliding wear behavior of a sustainable Fe-based coating and its damage mechanisms. Wear, 500-501, Article ID 204375.
Öppna denna publikation i ny flik eller fönster >>Sliding wear behavior of a sustainable Fe-based coating and its damage mechanisms
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2022 (Engelska)Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 500-501, artikel-id 204375Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The current industry demand is to identify suitable alternatives to the risk-of-supply prone and/or toxic, WC-Co and electrolytic hard chrome coatings without comprising the desired wear performance. Therefore, compositions based on abundantly available elements (e.g. ‘Fe’) that possess adequate wear resistance are desirable from health, sustainability and economic standpoints. In this work, crystalline Fe-based (Rockit-401) coatings were processed using two different thermal spray routes, i.e. HVOF and HVAF spraying. The influence of deposition route and processing conditions on the microstructure, porosity content, hardness and phase composition was examined. The as-deposited coatings were subjected to mild (5 N) and harsh (15 N) dry sliding wear test conditions by employing alumina ball as the counter surface material, and their wear performance was examined. Mild sliding wear test conditions (5 N) resulted in anomalous wear behavior, where the abrupt drop in CoF at several instances during the test was observed in all the investigated coatings. On the other hand, under harsh wear test conditions (15 N), such an abrupt dip in CoF was not observed. Detailed wear mechanisms of the coatings were revealed under different test conditions (5 N and 15 N). This work sheds light on processing, wear behavior and wear mechanisms of a sustainable and high-performance coating that fulfills non-toxic and sustainability goals in tandem for tribological applications. © 2022 The Authors

Ort, förlag, år, upplaga, sidor
Elsevier, 2022
Nyckelord
Alumina; Aluminum oxide; Hard coatings; HVOF thermal spraying; Sprayed coatings; Sustainable development; Testing; Wear of materials; Wear resistance; Ball-on-disk; Dry sliding wear; HVAF; HVOF; Rockit-401; Sliding wear behaviour; Test condition; Wear behaviors; Wear mechanisms; Wear performance; Tribology
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-18433 (URN)10.1016/j.wear.2022.204375 (DOI)000798740900001 ()2-s2.0-85129693885 (Scopus ID)
Forskningsfinansiär
Energimyndigheten, P46393-1
Anmärkning

Funding received from Energimyndigheten, Sweden, for Next-generation Coating Platform for Environment-friendly and Energy-efficient Vehicles (P46393-1) project is gratefully acknowledged.

Tillgänglig från: 2022-09-28 Skapad: 2022-09-28 Senast uppdaterad: 2022-09-28
Mahade, S., Venkat, A., Curry, N., Leitner, M. & Joshi, S. (2021). Erosion Performance of Atmospheric Plasma Sprayed Thermal Barrier Coatings with Diverse Porosity Levels. Coatings, 11(1), 1-21
Öppna denna publikation i ny flik eller fönster >>Erosion Performance of Atmospheric Plasma Sprayed Thermal Barrier Coatings with Diverse Porosity Levels
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2021 (Engelska)Ingår i: Coatings, ISSN 2079-6412, Vol. 11, nr 1, s. 1-21Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Thermal barrier coatings (TBCs) prolong the durability of gas turbine engine componentsand enable them to operate at high temperature. Several degradation mechanisms limit the durability of TBCs during their service. Since the atmospheric plasma spray (APS) processed 7–8 wt.% yttria stabilized zirconia (YSZ) TBCs widely utilized for gas turbine applications are susceptible to erosion damage, this work aims to evaluate the influence of their porosity levels on erosion behavior. Eight different APS TBCs were produced from 3 different spray powders with porosity ranging from 14% to 24%. The as-deposited TBCs were examined by SEM analysis. A licensed software was used to quantify the different microstructural features. Mechanical properties of the as-deposited TBCs were evaluated using micro-indentation technique. The as-deposited TBCs were subjected to erosion tests at different angles of erodent impact and their erosion performance was evaluated. Based on the results, microstructure-mechanical property-erosion performance was correlated. Findings from this work provide new insights into the microstructural features desired for improved erosion performance of APS deposited YSZ TBCs.

Ort, förlag, år, upplaga, sidor
MDPI, 2021
Nyckelord
Thermal barrier coating (TBC), erosion, fracture toughness, microstructure, porosity, atmospheric plasma spray, Yttria-stabilized Zirconiaconia
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17936 (URN)10.3390/coatings11010086 (DOI)000610026300001 ()2-s2.0-85099980423 (Scopus ID)
Tillgänglig från: 2021-12-16 Skapad: 2021-12-16 Senast uppdaterad: 2022-01-19Bibliografiskt granskad
Mahade, S., Mulone, A., Björklund, S., Klement, U. & Joshi, S. V. (2021). Incorporation of graphene nano platelets in suspension plasma sprayed alumina coatings for improved tribological properties. Applied Surface Science, 570, Article ID 151227.
Öppna denna publikation i ny flik eller fönster >>Incorporation of graphene nano platelets in suspension plasma sprayed alumina coatings for improved tribological properties
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2021 (Engelska)Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 570, artikel-id 151227Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Graphene possesses high fracture toughness and excellent lubrication properties, which can be exploited to enhance tribological performance of coating systems utilized to combat wear. In this work, suspension plasma spray (SPS) process was employed to deposit a composite, graphene nano-platelets (GNP) incorporated alumina coating. For comparison, monolithic alumina was also deposited utilizing identical spray conditions. The as-deposited coatings were characterized in detail for their microstructure, porosity content, hardness, fracture toughness and phase composition. Raman analysis of the as-deposited composite coating confirmed retention of GNP. The composite coating also showed good microstructural integrity, comparable porosity, higher fracture toughness and similar alumina phase composition as the monolithic alumina coating. The as-deposited coatings were subjected to dry sliding wear tests. The GNP incorporated composite coating showed lower CoF and lower specific wear rate than the pure alumina coating. Additionally, the counter surface also showed a lower wear rate in case of the composite coating. Post-wear analysis performed by SEM/EDS showed differences in the coating wear track and in the ball wear track of monolithic and composite coatings. Furthermore, Raman analysis in the wear track of composite coating confirmed the presence of GNP. The micro-indentation and wear test results indicate that the presence of GNP in the composite coating aided in improving fracture toughness, lowering CoF and specific wear rate compared to the monolithic coating. Results from this work demonstrated retention of GNP in an SPS processed coating, which can be further exploited to design superior wear-resistant coatings. 

Ort, förlag, år, upplaga, sidor
Elsevier B.V., 2021
Nyckelord
Alumina; Composite coatings; Fracture toughness; Graphene; Phase composition; Plasma jets; Plasma spraying; Platelets; Porosity; Sprayed coatings; Tribology; Wear of materials, Alumina coating; Composites coating; Deposited coatings; Dry sliding wear test; Graphene nano-platelet; Monolithic alumina; Nanoplatelet; Raman analysis; Suspension plasma sprays; Wear tracks, Aluminum oxide
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17510 (URN)10.1016/j.apsusc.2021.151227 (DOI)000724554400007 ()2-s2.0-85114835136 (Scopus ID)
Forskningsfinansiär
Vinnova
Anmärkning

The authors gratefully acknowledge financial support received from the national Strategic Innovation Programme for graphene, SIO Grafen, supporting the industrial graphene development in Sweden. The programme is supported by the Swedish government agencies Vinnova (Sweden’s Innovation Agency), the Swedish Energy Agency and the Swedish Research Council Formas. The project grant nr. is Dnr 2018-03315. We also thank Mr. Sven Forsberg, 2DFab AB, Sweden, for providing the water-based GNP suspension.

Tillgänglig från: 2021-09-30 Skapad: 2021-09-30 Senast uppdaterad: 2022-04-04Bibliografiskt granskad
Mahade, S., Aranke, O., Björklund, S., Dizdar, S., Awe, S., Musalek, R., . . . Joshi, S. V. (2021). Influence of processing conditions on the microstructure and sliding wear of a promising Fe-based coating deposited by HVAF. Surface & Coatings Technology, 409, 1-17, Article ID 126953.
Öppna denna publikation i ny flik eller fönster >>Influence of processing conditions on the microstructure and sliding wear of a promising Fe-based coating deposited by HVAF
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2021 (Engelska)Ingår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 409, s. 1-17, artikel-id 126953Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Thermal spray is a versatile and cost-effective process to deposit wear and corrosion resistant coatings. In this work, a relatively new ‘Fe-based’ chemistry comprising boride and carbides, is explored as a ‘greener’ alternative to the relatively expensive and carcinogenic Co-based coatings to mitigate wear. The emergent thermal spray process of high-velocity air-fuel (HVAF) spraying was chosen to deposit the Fe-based coatings, with the high-velocity oxy-fuel (HVOF) also being employed solely for the purpose of preliminary comparison. Detailed characterization of the HVOF and HVAF sprayed Fe-based coatings was carried out. Microstructure, porosity, hardness and phase analysis results demonstrate the influence of processing conditions, where specific spray conditions yielded minimal undeformed particulates content, high hardness, low porosity and feedstock phase retention. Differences in microstructural features of the as-deposited coatings in relation to their processing conditions are discussed in detail. The coatings were subjected to ball-on-disc tribometry tests at different load conditions and their friction and wear performance were evaluated. The coefficient of friction results of investigated coatings concurred with their respective microstructural features. Post-mortem of the worn coating surface, the mating alumina ball surface and wear debris was performed using SEM/EDS analysis to understand the associated wear mechanisms and material transfer. This work provides new insights on identifying appropriate HVAF processing conditions to achieve acceptable microstructural features and phases in Fe-based coatings for improved wear performance.

Ort, förlag, år, upplaga, sidor
Elsevier, 2021
Nyckelord
Ball-on-disc test; Friction, wear, FeSP586; High velocity air fuel (HVAF); High velocity oxy fuel (HVOF)
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17243 (URN)10.1016/j.surfcoat.2021.126953 (DOI)000654045600079 ()2-s2.0-85100486733 (Scopus ID)
Forskningsfinansiär
Energimyndigheten, P46393-1
Tillgänglig från: 2021-11-11 Skapad: 2021-11-11 Senast uppdaterad: 2022-04-01
Mahade, S., Mulone, A., Björklund, S., Klement, U. & Joshi, S. V. (2021). Investigating load-dependent wear behavior and degradation mechanisms in Cr3C2-NiCr coatings deposited by HVAF and HVOF. Journal of Materials Research and Technology, 15, 4595-4609
Öppna denna publikation i ny flik eller fönster >>Investigating load-dependent wear behavior and degradation mechanisms in Cr3C2-NiCr coatings deposited by HVAF and HVOF
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2021 (Engelska)Ingår i: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 15, s. 4595-4609Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Wear resistant coatings that comply with non-toxic environment goals are highly desirable. Cr3C2–NiCr is a promising alternative to the toxic, ‘Co’- containing WC–Co coatings to mitigate wear. The purpose of this study was to examine the suitability of Cr3C2–NiCr coatings for automotive brake disc application by systematically investigating their dry sliding wear behavior at different test conditions. Therefore, High Velocity Air Fuel (HVAF) and High Velocity Oxy Fuel (HVOF) were employed to deposit Cr3C2–NiCr coatings. The powder feedstock and as-deposited Cr3C2–NiCr coatings were characterized for their microstructure and phase composition using SEM and XRD. Mechanical properties (hardness, fracture toughness), porosity and surface topography of the as-deposited coatings were evaluated. The coatings were subjected to sliding wear tests at different normal loads (5 N, 10 N and 15 N) using alumina ball as the counter surface. Coefficient of friction (CoF) evolution of HVAF and HVOF deposited coatings, along with their wear performance, was obtained for different normal load conditions. The wear performance ranking of HVAF and HVOF processed coatings was influenced by the test conditions, with HVAF coatings demonstrating better wear resistance than HVOF coatings at harsh test conditions and the HVOF coatings performing better under mild wear test conditions. Detailed post-wear analysis of worn coatings, the alumina ball counter-body and the resulting debris was performed to reveal the degradation mechanisms at different test conditions. Findings from this work provide new insights into the desirable microstructural features to mitigate wear, which can be further exploited to deposit wear-resistant coatings.

Ort, förlag, år, upplaga, sidor
Elsevier Editora Ltda, 2021
Nyckelord
Ball-on-disc test, Cr3C2–NiCr, Wear, High velocity air fuel (HVAF), High velocity oxy-fuel
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17783 (URN)10.1016/j.jmrt.2021.10.088 (DOI)000717662900006 ()2-s2.0-85118337045 (Scopus ID)
Forskningsfinansiär
Energimyndigheten, 2018-003191
Tillgänglig från: 2021-12-20 Skapad: 2021-12-20 Senast uppdaterad: 2021-12-20
Mahade, S., Mulone, A., Björklund, S., Klement, U. & Joshi, S. (2021). Novel suspension route to incorporate graphene nano-platelets in HVAF-sprayed Cr3C2–NiCr coatings for superior wear performance. Journal of Materials Research and Technology, 13, 498-512
Öppna denna publikation i ny flik eller fönster >>Novel suspension route to incorporate graphene nano-platelets in HVAF-sprayed Cr3C2–NiCr coatings for superior wear performance
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2021 (Engelska)Ingår i: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 13, s. 498-512Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Graphene nano platelets (GNP) have several attractive properties, including excellent lubricity that can be used to develop wear-resistant coatings. Thermally sprayed chromium carbide–nickel chromium (Cr3C2–NiCr) coatings are widely employed to impart wear resistance to engineering components. This work attempts to improve the wear resistance of high velocity air fuel (HVAF) sprayed Cr3C2–NiCr coatings by incorporating GNP using a hybrid approach in which Cr3C2–NiCr (powder) and GNP (suspension) are co-axially injected. Two different powder-to-suspension delivery ratios were employed in this study that utilizes a liquid feedstock in tandem with a HVAF system. Furthermore, for comparison, a pure (without graphene) Cr3C2–NiCr reference coating was deposited by the HVAF process using identical spray parameters. The as-sprayed coatings were characterized for their microstructure and phase constitution by SEM/EDS and X-Ray Diffraction. Mechanical properties such as hardness and fracture toughness were evaluated using micro-indentation technique. The hybrid coatings were subjected to dry sliding wear tests and wear performance was compared with reference Cr3C2–NiCr. The GNP incorporated hybrid coatings exhibited lower CoF and lower wear rates than the reference Cr3C2–NiCr coating. Post wear SEM/EDS analysis revealed different wear mechanisms predominant in the investigated coatings. Utilizing the above as a case study, this work provides key insights into a new approach to produce GNP incorporated coatings for mitigating wear.

Ort, förlag, år, upplaga, sidor
Elsevier, 2021
Nyckelord
Metals and Alloys, Surfaces, Coatings and Films, Biomaterials, Ceramics and Composites
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-17923 (URN)10.1016/j.jmrt.2021.04.096 (DOI)000677670200008 ()2-s2.0-85116863849 (Scopus ID)
Forskningsfinansiär
EnergimyndighetenForskningsrådet FormasVinnova
Tillgänglig från: 2021-12-13 Skapad: 2021-12-13 Senast uppdaterad: 2022-04-04Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-2475-9284

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