Cavitation erosion behavior of HVOF CaviTec coatings

Lavigne, Sébastien; Pougoum, Fabrice; Savoie, S.; Martinů, L.; Klemberg-Sapieha, Jolanta E.; Schulz, Robert

doi:10.1016/j.wear.2017.06.003

Cited by 60 publications

(28 citation statements)

References 30 publications

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“…The development of this industry-scale technique has allowed the replacement of erosion-corrosion resistant hard-chrome coatings in different applications including valves, hydraulic pistons, and aircraft landing gears [1,2]. When compared with other standard coating deposition methods such as weld-overlay, thermal spray has a reduced effect on the substrate's chemistry and geometry, making it an interesting process for the repair of parts used, for example, in the paper and steel industries [3] as well as in hydroelectric turbines [4].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings

et al. 2019

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Thermally sprayed stainless-steel coatings were produced with a wide range of deposition parameters. The electrochemical behavior of polished coatings was monitored for 3 weeks in 3.5 wt.% NaCl aqueous solution and compared to that of reference materials including a wrought stainless steel plate and a bulk ingot produced by arc melting of the spraying powder feedstock. Transitions in the polarization behavior are discussed based on the observed changes in coating microstructures as well as on the shifts in X-ray photoelectron spectra (XPS). Results show that the deposition parameters have a strong effect on the coating microstructures but the small differences in the polarization behavior of coatings mostly disappear after 1 week of testing. Microstructure evidence shows preferential corrosion at splats experiencing melting prior to deposition. Pitting and corrosion products between splat boundaries are also reported. XPS analysis shows that the coating surfaces are enriched in chromium oxides and hydroxides. Comparison between the coating and bulk stainless steels suggests that coating inherent defects play a major role on their impaired corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings

et al. 2019

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“…Additionally, the thin HIPIMS coatings (about 4 microns) outperform thick coatings reported in the literature, such as those deposited by Chemical Vapour Deposition (CVD) [29] and High Velocity Oxy Fuel (HVOF) [30,31] processes. It is revealed that the thick but porous HVOF coatings demonstrate almost no incubation period under CE.…”

Section: Results Of the Ce Tests Show That Both Hipims Coated Specimementioning

confidence: 99%

Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Harvey

Wellman

et al. 2019

Journal of Alloys and Compounds

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Water droplet erosion (WDE) protection of Ti6Al4V turbofan blades is of paramount importance to the aviation industry. A novel CrAlYN/CrN nanoscale multilayer coating deposited by the HIPIMS technique was evaluated as a potential candidate for this application. Literature suggests a strong correlation in performance ranking under WDE and cavitation erosion (CE) tests. Hence, the WDE performance of the CrAlYN/CrN coating on Ti6Al4V was investigated with an ultrasonic cavitation device. The results show excellent adhesion and superior erosion resistance of the CrAlYN/CrN coating (erosion rate lower by a factor of 14 compared to the bare Ti6Al4V substrate) and compared to coatings reported in the literature with spallation as their main erosion mechanism. Cross-sectional FIB studies revealed formation of substrate cracks underneath 2 the coating when CE generated stresses exceeded the fatigue strength of the Ti6Al4V alloy.The interfaces of the nanoscale multilayers protected the substrate by forming an effective barrier against shock waves, delayed fatigue crack formation, deflected and arrested any cracks formed impeding the overall coating damage. The research shows that the CE resistance is influenced by the coating's texture and elastic properties, (Young's modulus).The paper discusses the erosion mechanisms of the coating and the excellent CE protection it offers.

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“…WC-Co [51]) by means of various methods e.g. High Velocity Oxy-Fuel Thermal Spray (HVOF) [52], [53], PVD [54], [55], [56]), Vacuum Plasma Spraying (VPS) [57], Atmospheric Plasma Spraying (APS) [58], arc spraying (ARC) [44], or Plasma Assisted Physical Vapour Deposition (PAPVD) [59]. Friction stir process (FSP) [28] is, as mentioned, another surface treatment used to reduce grain size and improve CER.…”

Section: Coatingsmentioning

confidence: 99%

Cavitation Erosion Resistance Influence of Material Properties

Zakrzewska

Krella

2019

Advances in Materials Science

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The cavitation erosion is the phenomena that causes degradation of fluid flow machinery components due to repetitive implosion of cavitation bubbles adjacent to the solid surface. Cavitation erosion is a complex phenomenon, which includes not only hydrodynamic factors of liquid, but also properties of erodible material e.g. microstructure, hardness or Young modulus. In order to reduce the negative impact of erosion on machine components, there are many methods to increase cavitation erosion resistance. The paper discusses the correlations between structural and mechanical properties and the resistance to cavitation erosion (CER) of pure materials, their alloys and coatings. Methods to increase CER have also been described - using heat / thermo-chemical treatment and application of coatings by various methods.

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Cavitation erosion behavior of HVOF CaviTec coatings

Cited by 60 publications

References 30 publications

Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings

Electrochemical Behavior, Microstructure, and Surface Chemistry of Thermal-Sprayed Stainless-Steel Coatings

Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Cavitation Erosion Resistance Influence of Material Properties

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