Effect of Carbide Dissolution on Chlorine Induced High Temperature Corrosion of HVOF and HVAF Sprayed Cr3C2-NiCrMoNb Coatings

Fantozzi, Davide; Matikainen, Ville; Uusitalo, Mikko A.; Koivuluoto, Heli; Vuoristo, Petri

doi:10.1007/s11666-017-0645-3

Cited by 15 publications

(5 citation statements)

References 34 publications

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“…The second HVOF coating NiCoCrAlY has a two-phase composition consisting of γ-Ni(Co,Cr) and β-NiAl, which follows findings obtained for MCrAlY coating deposited by HVOF [ 60 , 61 ]. The third sample, NiCrMoNbTa presents a single-phase structure based on γ-Ni(NiCr) which corresponds to the results obtained for HVOF fabricated NiCrMoNb-matrix composites [ 12 , 62 ]. The coatings’ microstructure and phase composition differs and, of course, influences coatings hardness, see Figure 7 .…”

Section: Resultssupporting

confidence: 53%

Effect of Microstructure and Hardness on Cavitation Erosion and Dry Sliding Wear of HVOF Deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa Coatings

Szala¹,

Walczak²,

Świetlicki³

2021

Materials

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Metallic coatings based on cobalt and nickel are promising for elongating the life span of machine components operated in harsh environments. However, reports regarding the ambient temperature tribological performance and cavitation erosion resistance of popular MCrAlY (where M = Co, Ni or Co/Ni) and NiCrMoNbTa coatings are scant. This study comparatively investigates the effects of microstructure and hardness of HVOF deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa coatings on tribological and cavitation erosion performance. The cavitation erosion test was conducted using the vibratory method following the ASTM G32 standard. The tribological examination was done using a ball-on-disc tribometer. Analysis of the chemical composition, microstructure, phase composition and hardness reveal the dry sliding wear and cavitation erosion mechanisms. Coatings present increasing resistance to both sliding wear and cavitation erosion in the following order: NiCoCrAlY < CoNiCrAlY < NiCrMoNbTa. The tribological behaviour of coatings relies on abrasive grooving and oxidation of the wear products. In the case of NiCrMoNbTa coatings, abrasion is followed by the severe adhesive smearing of oxidised wear products which end in the lowest coefficient of friction and wear rate. Cavitation erosion is initiated at microstructure discontinuities and ends with severe surface pitting. CoNiCrAlY and NiCoCrAlY coatings present semi brittle behavior, whereas NiCrMoNbTa presents ductile mode and lesser surface pitting, which improves its anti-cavitation performance. The differences in microstructure of investigated coatings affect the wear and cavitation erosion performance more than the hardness itself.

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Section: Resultssupporting

confidence: 53%

Effect of Microstructure and Hardness on Cavitation Erosion and Dry Sliding Wear of HVOF Deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa Coatings

Szala¹,

Walczak²,

Świetlicki³

2021

Materials

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“…The zirconia coating was found to improve the resistance to corrosion [6]. Highly corrosion and wear resistant chromium carbide (Cr3C2)based cermet coatings have been thermally sprayed onto traditional fluidized bed combustors (FBC) operating with ecological waste and biomass fuels [7]. A bi-layer Alloy-718/NiCrAlY coating was deposited on grey cast iron substrate using the HVOF technique.…”

Section: Introductionmentioning

confidence: 99%

HVOF Sprayed Mullite Coatings for Use In Extreme Environments

Bellie¹,

Suresh²,

Ragunath³

2020

JTSE

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Products used in industry and marine applications are exposed to extreme environments like high heat, humidity, acidic or alkaline or hyper saline environment, UV and IR radiation. Metals with good corrosion and oxidation resistance may be used but are restricted to Ni and Cr alloys, titanium and super alloys etc., which are costly and have their limitations. Hence ceramic coatings on low cost metals may be an answer to this problem. Ceramics are inherently chemically inert, high temperature resistant, corrosion and oxidation resistant. Flame spraying of ceramics is a good and reliable method for applying ceramic coatings on metallic substrates with good bond strength (> 80 MPa) and 1% porosity. In this work, HVOF technique is applied to obtain 100 microns thick mullite coatings on MS substrates with a NiCr bond coat. Mullite has a high oxidation and corrosion resistance. It is chemically inert. It has high temperature resistance even at 2000 C. These properties are ideal for industrial components exposed to salty environments. Characterization studies like XRD, SEM/EDS, Corrosion tests using polarization technique, coating thickness and surface roughness have been studied and reported. A corrosion rate of 1.55 mm/ year has been achieved in a sea water environment.

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“…It is probable that the first phase of the cooling of the liquid metal in the melt pool is accompanied by the cracking of the carbide, triggered by the concentration of tensile stresses in carbide defects (Figure 11c). Tests concerning tensile stresses generated during the laser-aided alloying of steel with cobalt alloys (using various laser process parameters) are discussed, among others, in publications [61,62]. As regards the particles of synthetic metal-diamond composite coated with tungsten, only some part of tungsten passes to the solution (Figure 12d).…”

Section: Metallographic Test Results and The Results Of Xrd Analysismentioning

confidence: 99%

Innovative Technologies and Materials for the Production of Mechanical, Thermal and Corrosion Wear-Resistant Surface Layers and Coatings

2023

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He is a member of the Polish Welding Society and a member of the Programme Council of the Persons Certification Body T ÜV Rheinland Polska. In his scientific activity, he deals with technologies of welding, brazing, thermal cutting, surfacing, and thermal spraying, as well as quality control in welding. Dr. Artur Czupryski is the author or coauthor of 3 books and academic textbooks, as well as more than 200 articles and 2 patents. In 2018, he received the Stanisław Olszewski Medal awarded by the SIMP Welding Section to the most outstanding Polish and foreign welding engineers "in recognition of their contribution to Polish welding". For his scientific, didactic, and organisational achievements, he has been repeatedly awarded individual and team awards by the Rector of the Silesian University of Technology and decorated by the President of the Republic of Poland.

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Effect of Carbide Dissolution on Chlorine Induced High Temperature Corrosion of HVOF and HVAF Sprayed Cr3C2-NiCrMoNb Coatings

Cited by 15 publications

References 34 publications

Effect of Microstructure and Hardness on Cavitation Erosion and Dry Sliding Wear of HVOF Deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa Coatings

Effect of Microstructure and Hardness on Cavitation Erosion and Dry Sliding Wear of HVOF Deposited CoNiCrAlY, NiCoCrAlY and NiCrMoNbTa Coatings

HVOF Sprayed Mullite Coatings for Use In Extreme Environments

Innovative Technologies and Materials for the Production of Mechanical, Thermal and Corrosion Wear-Resistant Surface Layers and Coatings

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