Isothermal oxidation and hot corrosion behaviors of diffusion aluminide coatings deposited by chemical vapor deposition

Xu, Zhenhua; Dai, Jianwei; Niu, Jing; He, Limin; Mu, Rende; Wang, Zhankao

doi:10.1016/j.jallcom.2015.01.227

Cited by 28 publications

(11 citation statements)

References 21 publications

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“…Additional aluminide coatings deposited on these alloys improve their thermal and chemical resistance during operation in high temperature and aggressive environments [ 3 , 4 ]. Specifically, aluminide thermal coatings have been found to effectively prevent oxidation and carbonization in high temperature conditions [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Barrier Stability and Wear Behavior of CVD Deposited Aluminide Coatings for MAR 247 Nickel Superalloy

et al. 2020

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In this paper, aluminide coatings of various thicknesses and microstructural uniformity obtained using chemical vapor deposition (CVD) were studied in detail. The optimized CVD process parameters of 1040 °C for 12 h in a protective hydrogen atmosphere enabled the production of high density and porosity-free aluminide coatings. These coatings were characterized by beneficial mechanical features including thermal stability, wear resistance and good adhesion strength to MAR 247 nickel superalloy substrate. The microstructure of the coating was characterized through scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. Mechanical properties and wear resistance of aluminide coatings were examined using microhardness, scratch test and standardized wear tests, respectively. Intermetallic phases from the Ni-Al system at specific thicknesses (20–30 µm), and the chemical and phase composition were successfully evaluated at optimized CVD process parameters. The optimization of the CVD process was verified to offer high performance coating properties including improved heat, adhesion and abrasion resistance.

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Section: Introductionmentioning

confidence: 99%

Thermal Barrier Stability and Wear Behavior of CVD Deposited Aluminide Coatings for MAR 247 Nickel Superalloy

et al. 2020

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“…ey are widely used for the improvement of the corrosion resistance of iron-and nickel-based alloys. Among these intermetallics, Fe and Ni aluminides improve the resistance to many aggressive environments including oxidising [3,4], sulphidising [5], and carburising [6,7] agents. ese coatings extend the lifetime of the equipment as a result of the carburisation reduction of the surface layer.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Al‐Si Slurry Coatings on Austenitic High‐Temperature Creep Resisting Cast Steel

Kochmańska

2018

Advances in Materials Science and Engineering

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is paper presents the results of microstructural examinations on slurry aluminide coatings using scanning electron microscopy, X-ray microanalysis, and X-ray diffraction. Aluminide coatings were produced in air atmosphere on austenitic high-temperature creep resisting cast steel. e function of aluminide coatings is the protection of the equipment components against the high-temperature corrosion in a carburising atmosphere under thermal shock conditions. e obtained coatings had a multilayered structure composed of intermetallic compounds. e composition of newly developed slurry was powders of aluminium and silicon; NaCl, KCl, and NaF halide salts; and a water solution of a soluble glass as an inorganic binder. e application of the inorganic binder in the slurry allowed to produce the coatings in one single step without additional annealing at an intermediate temperature as it is when applied organic binder. e coatings were formed on both: the ground surface and on the raw cast surface. e main technological parameters were temperature (732-1068°C) and time of annealing (3.3-11.7 h) and the Al/Si ratio (4-14) in the slurry. e rotatable design was used to evaluate the effect of the production parameters on the coatings thickness. e correlation between the technological parameters and the coating structure was determined.

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“…The agglomeration of the CNTs on the surface of the BFs generates voids and micro-cracks which weakens the binding between the BFs and epoxy resin. The corrosive medium can first enter the weak (micro-crack) zone and attack the coating [23]. On the other hand, the agglomeration of the CNTs on the surface of the BFs re-increased the water absorption which is due to the increase of extra paths for water from the voids and micro-cracks.…”

Section: Discussionmentioning

confidence: 99%

A Novel Basalt Flake Epoxy Resin Coating Modified by Carbon Nanotubes

Luo

Wang²,

Qian

et al. 2019

Coatings

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As a new type of anticorrosive material, basalt flakes (BFs) have been widely used in the marine industry due to their good acid and alkali corrosion resistance and dispersion stability. In this work, the effect of carbon nanotubes (CNTs) addition on properties improvement of basalt flake epoxy resin (CNT-BF/EP) coating was studied. Firstly, 0–0.7 wt.% acidified CNTs was used to modify the surface of the BFs and the CNT-BF/EP coating was successfully prepared. Experimental results showed that the performance of the interfacial compatibility, the tensile strength, and acid and alkali resistance of the CNT-BF/EP coating were significantly improved with the addition of the CNTs. Particularly, the CNT-BF/EP coating achieved the best comprehensive properties (tensile strength increased to 30.3 MPa, surface weight loss rate of only 1.0 wt.% in the acid environment for 480 h, and water absorption of only 1.1 wt.% after 480 h) when the CNTs addition reached 0.5 wt.%. This work suggests a feasible way to enhance the mechanical properties and chemical durability of the basalt flakes coating.

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Isothermal oxidation and hot corrosion behaviors of diffusion aluminide coatings deposited by chemical vapor deposition

Cited by 28 publications

References 21 publications

Thermal Barrier Stability and Wear Behavior of CVD Deposited Aluminide Coatings for MAR 247 Nickel Superalloy

Thermal Barrier Stability and Wear Behavior of CVD Deposited Aluminide Coatings for MAR 247 Nickel Superalloy

Microstructure of Al‐Si Slurry Coatings on Austenitic High‐Temperature Creep Resisting Cast Steel

A Novel Basalt Flake Epoxy Resin Coating Modified by Carbon Nanotubes

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