Aluminide Coatings for Power-Generation Applications

Zhang, Ying

doi:10.2172/885900

Cited by 3 publications

(3 citation statements)

References 72 publications

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“…Recent studies have extensively focused on the growth kinetics of aluminide coating in NiÀ Al and FeÀ Al systems. [16,[22][23][24][25][26] However, research on the growth kinetics of multi-element co-deposited coatings, which presents inherent complexities, remains scarce. [22][23][24] The complexity of co-deposited coatings has presented challenges, leading to a scarcity of studies in this area.…”

Section: Introductionmentioning

confidence: 99%

Relationship among Thermodynamic, Growth Kinetics, and Microstructure Characterization of the Simple and Silicon‐Modified Aluminide Coating on Ni‐based Superalloy

Dai,

Zou,

Ning

et al. 2024

ChemistrySelect

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This research investigates the effects of pack cementation parameters on the thermodynamics, growth kinetics, and microstructure of the simple and silicon‐modified aluminide coatings on the IN718 superalloy. The growth kinetic modelling of the aluminide coating, activated by NH4Cl, is established as . further optimizing the kinetics modelling that includes both CaCl2 activator or the mixture of CaCl2 and NH4Cl. The results showed that NH4Cl as an activator generated a higher equilibrium partial pressure of halides, which enhanced the deposition efficiency of active Al atoms and facilitated the significant precipitation of Cr‐rich carbides. Additionally, part of the CaCl2 substitute NH4Cl could maintain a high coating growth rate and reduce the hazards. Adding Si element preferentially combines with Cr formed the Cr9.1Si0.9 phase along grain boundaries, which blocked the inner‐diffusion channels of Al atoms and reduced the thickness of the silicon‐modified aluminide coating compared to simple aluminide coating. These researches revealed the relationship among the thermodynamics, growth kinetics, and microstructure of simple and silicon‐modified aluminide coatings. The thickness and microstructure of coatings can be effectively regulated by adjusting the powder composition, content, and process parameters to achieve precise control.

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Section: Introductionmentioning

confidence: 99%

Relationship among Thermodynamic, Growth Kinetics, and Microstructure Characterization of the Simple and Silicon‐Modified Aluminide Coating on Ni‐based Superalloy

Dai,

Zou,

Ning

et al. 2024

ChemistrySelect

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“…Heat-resistant precision alloys of the Fe-Cr-Al system are widely used as a material for electric heating and resistive elements, structural elements of fuel shells, protective constructions of nuclear reactors, elements of steam turbine power plants, in household appliances [1][2][3][4][5][6][7][8][9][10][11]. The heat resistance of FeCrAl-alloys is largely determined by the aluminum content.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Phase Transformations in FeAl(Cr,Si) / Fe<sub>3</sub>Al(Cr,Si) / Fe(Al,Cr,Si) Laminated Coating on the Cr15Al5 Alloy

Шморгун

Богданов

Kulevich

et al. 2020

MSF

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The influence of thermal action at 1150 °C on the kinetics of phase transformations in a layered coating FeAl (Cr,Si) / Fe3Al (Cr,Si) / Fe (Al,Cr,Si), obtained using a technology involving aluminizing of an Cr15Al5 alloy by hot dipping in silumin melt AK12M2 and heat treatment. It was shown that after 100 hours of exposure, the visually distinguishable boundary between the coating and the alloy disappears. The aluminum content in the Cr15Al5 alloy increased to 17 at. %, silicon up to 3 at. %, and chromium is reduced to 14 at. %. The microhardness of the alloy increases from 1.6 to 2.4 GPa and survivability at a test temperature of 1150 °C increases from 120 to at least 920 hours.

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“…Owing to this, several alumina forming alloys have been developed and used for high temperature applications in petroleum industries, power plants, turbine driven systems, etc. [1][2][3] Al 2 O 3 coatings have specifically gained attention for fusion reactor applications. Specific to test blanket modules in fusion reactors, Al 2 O 3 has been considered as candidate coating to (i) resist tritium permeation, (ii) corrosion of structural materials by Pb-17Li and (iii) provide electrical insulation against magnetohydrodynamic drag.…”

Section: Introductionmentioning

confidence: 99%

Al₂O₃ films grown by glow discharge plasma aluminising

Jamnapara

Nayak

Avtani

et al. 2014

Surface Engineering

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Aluminising of 9Cr steel substrates followed by heat treatment has been attempted to generate Al 2 O 3 films along with Fe-Al diffusion zone at the coating/substrate interface. Effect of glow discharge plasma processing on the phase and microstructure of resultant alumina films in comparison with thermally processed samples has been reported. The thermal and plasma treated samples were characterised using X-ray diffraction, scanning electron microscopyenergy dispersive X-ray spectroscopy, electron probe microanalysis, X-ray photoelectron spectroscopy (XPS) and nanoindentation techniques. X-ray diffraction and XPS studies revealed c-Al 2 O 3 phase in both thermal and plasma processed samples. The XPS data indicated higher binding energies in plasma processed Al 2 O 3 films as compared to thermally processed Al 2 O 3 films. Scanning electron microscopy observations revealed cracks in thermally grown Al 2 O 3 films while the same was not observed in plasma processed films. The EDX analysis revealed Fe(Al) diffusion layer of y3 mm in plasma processed films while the same was not observed in thermally treated samples. Nanoindentation tests on plasma grown alumina films indicated 16?96 GPa hardness while hardness for thermally grown alumina films was found to be 9?95 GPa. The role of plasma in generating a crack free alumina film has been discussed.

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Aluminide Coatings for Power-Generation Applications

Cited by 3 publications

References 72 publications

Relationship among Thermodynamic, Growth Kinetics, and Microstructure Characterization of the Simple and Silicon‐Modified Aluminide Coating on Ni‐based Superalloy

Relationship among Thermodynamic, Growth Kinetics, and Microstructure Characterization of the Simple and Silicon‐Modified Aluminide Coating on Ni‐based Superalloy

Kinetics of Phase Transformations in FeAl(Cr,Si) / Fe<sub>3</sub>Al(Cr,Si) / Fe(Al,Cr,Si) Laminated Coating on the Cr15Al5 Alloy

Al₂O₃ films grown by glow discharge plasma aluminising

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Aluminide Coatings for Power-Generation Applications

Cited by 3 publications

References 72 publications

Relationship among Thermodynamic, Growth Kinetics, and Microstructure Characterization of the Simple and Silicon‐Modified Aluminide Coating on Ni‐based Superalloy

Relationship among Thermodynamic, Growth Kinetics, and Microstructure Characterization of the Simple and Silicon‐Modified Aluminide Coating on Ni‐based Superalloy

Kinetics of Phase Transformations in FeAl(Cr,Si) / Fe<sub>3</sub>Al(Cr,Si) / Fe(Al,Cr,Si) Laminated Coating on the Cr15Al5 Alloy

Al2O3 films grown by glow discharge plasma aluminising

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Al₂O₃ films grown by glow discharge plasma aluminising