Corrosion Behavior of the CoNiCrAlY-Al2O3 Composite Coating Based on Core-Shell Structured Powder Design

Guo, Wenmin; Zhang, Honglin; Zhao, Shan; Ding, Zhibing; Liu, Bin; Li, Wenjuan; Xu, Hang; Liu, Huiyuan

doi:10.3390/ma14227093

Cited by 14 publications

(7 citation statements)

References 54 publications

(72 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For Co-NiCrAlY-Al2O3 coating powder, it can be observed from the figure that the higher peaks for -Co-Ni-Cr phase with smaller peaks for -Al2O3 phase and -Co, Ni, Cr, Al phase are detected. This is in line with the findings that have been documented in the relevant research [11].…”

Section: Figure 3 Sand Particles and Corresponding Eds Spectrumsupporting

confidence: 93%

“…It can be observed quite evidently that the basic composition of the sand particle is silica (SiO2) and very finely shaped and sized alumina particles. [11]. For Co-NiCrAlY-Al2O3 coating powder, it can be observed from the figure that the higher peaks for -Co-Ni-Cr phase with smaller peaks for -Al2O3 phase and -Co, Ni, Cr, Al phase are detected.…”

Section: Figure 3 Sand Particles and Corresponding Eds Spectrummentioning

confidence: 84%

See 1 more Smart Citation

Wear behavior of bare and coated 18Cr8Ni turbine steel exposed to sediment erosion: A comparative analysis

Pandey,

Gupta,

Kumar

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Hydropower plant components are exposed to sediment erosion due to the impact of hard particles flowing along with the water. As a consequence, significant material loss and substantial reduction in efficiency are encountered during plant operation. This work investigates the sediment erosion problem in hydraulic turbines using a slurry erosion tester. Experiments are performed on bare and coated 18Cr8Ni turbine steel at three impact velocities i.e. 6, 8, and 12 m/s, and two impact angles 30° and 90°. The size of impacting particles varies between 50 to 350 µm with a slurry concentration of 2500 ppm. The erosion rate is found to be maximum at 30° impact angle and minimum at 90° impact angle. With an aim to minimize the erosion of turbine steel, the test samples were coated with in-house formulated ceramic-based coating material using the high-velocity oxygen-fuel thermal spray technique. Vickers hardness test was performed to determine the hardness of the coatings. For metallurgical characterization, scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy techniques were used. A comparison of both bare and coated samples is carried out to observe the erosion-resistant aspects. A higher erosion resistance has been detected for the coated material as compared to the bare turbine material. The reduction in the erosion rate for coatings is 13.4% at 30° and 17.62% at 90° impingement angles. The obtained results are related to the tested materials’ microstructural, mechanical, and metallurgical aspects.

show abstract

Section: Figure 3 Sand Particles and Corresponding Eds Spectrumsupporting

confidence: 93%

Section: Figure 3 Sand Particles and Corresponding Eds Spectrummentioning

confidence: 84%

Wear behavior of bare and coated 18Cr8Ni turbine steel exposed to sediment erosion: A comparative analysis

Pandey,

Gupta,

Kumar

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Core-shell structured powders are a special class of materials having multifunctional properties [1][2][3][4][5][6]. This unique powder structure allows a convenient superimposition of the core and shell phase properties [5,6].…”

Section: Introductionmentioning

confidence: 99%

Nd2Fe14B/FeCo Core-Shell Nanoparticle Synthesis Using Galvanic Substitution Based Electroless Plating

Haq¹,

Song²,

Lee³

et al. 2022

Preprint

View full text Add to dashboard Cite

Core-shell structured magnetic nanoparticles combine hard and a soft phases to improve energy efficiency. The mutual interaction of the two phases can lead to the exchange spring effect leading to higher magnetic energy. In this regard, synthesis of Nd2Fe14B based core-shell structured powders have proven to be elusive due to the relatively reactive nature of this phase. In this study, a process has been established for successfully coating the surface of Nd2Fe14B powders with FeCo layer using galvanic displacement method. Initially, a binary phase magnetic powder was synthesized containing Nd2Fe14B and Nd2Fe17 phase. Subsequently, the powders were coated using a Co precursor at 303 K. During coating the metastable Nd2Fe17 phase was dissolved and the Fe ions were released into the solution. Subsequently, the Fe ions deposited together with the Co ions on the surface of Nd2Fe14B powder to form a FeCo shell. The deposited layer thickness and composition was confirmed using TEM analysis.

show abstract

“…The problems occur due to direct contact of the metallic powder with the oxygen during the particle flight time. To avoid oxidation during particle flight W. Guo et al, manufactured a mechanically alloyed CoNiCrAlY powder [15]. The shell of alumina, approximately 1 µm was formed on CoNiCrAlY by ball milling.…”

Section: Introductionmentioning

confidence: 99%

“…The coatings produced by core-shell structure powder exhibit low oxide formation in the thermal spraying process. The low oxide content during HVOF process assists the formation of a dense alumina layer during thermal cycling and has good corrosion resistance [15]. The partial drawback of the core-shell powder coating is the poor deformability of the powder while hitting the target material which causes excessive porosity and some hard Al-Ni phases in the final coating.…”

Section: Introductionmentioning

confidence: 99%

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Niaz

Fuhaid²,

Faraz³

2022

Coatings

View full text Add to dashboard Cite

The thermal insulation and integrity of the thermal barrier coating is hampered by the formation of mixed oxide at intermediate bond coat. The existing reported work correlates growth of mixed oxide to the microstructural and phase changes. The track mostly used to study these changes is scanning electron microscopy, X-ray diffraction, and electrochemical testing. Oxide growth is principally an electrochemical process; hence a thirst exists to study this aspect by using advanced electrochemical techniques. In this study scanning electrochemical microscopy is used to reveal the electrochemical activity in the closest vicinity of the surface. A raster scan of 500 µm area was carried out by microelectrode in an electrolyte at a distance of 5 µm above the surface to record the current profile. The activity at the surface was confirmed by current distance curves. The tip of the microelectrode was approached from 60 µm height to 2 µm above the surface. The current–distance curves for the coating without heat-treatment show an active surface while the heat-treated one show non active surface. The average coating electrochemical response was further studied by polarization curves impedance spectroscopy. The X-ray photoelectron spectroscopy results show that oxidation and formation of the mixed oxide increase with polarization.

show abstract

Corrosion Behavior of the CoNiCrAlY-Al2O3 Composite Coating Based on Core-Shell Structured Powder Design

Cited by 14 publications

References 54 publications

Wear behavior of bare and coated 18Cr8Ni turbine steel exposed to sediment erosion: A comparative analysis

Wear behavior of bare and coated 18Cr8Ni turbine steel exposed to sediment erosion: A comparative analysis

Nd2Fe14B/FeCo Core-Shell Nanoparticle Synthesis Using Galvanic Substitution Based Electroless Plating

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Contact Info

Product

Resources

About