Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Zhang, Pimin; Peng, Ru Lin; Li, Xinhai; Johansson, Sten

doi:10.3390/coatings8040129

Cited by 10 publications

(4 citation statements)

References 40 publications

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“…Oxygen has been identified on the surface of the coatings, which is consistent with the literature data [1] presented for Cr3C2-NiCr coatings produced by HVOF, moreover, oxidation of the coating material can lead to decarburization of Cr3C2 carbide and formation of Cr7C3 carbides [11]. In the case of coatings of the MCrAlY type, the forming aluminum oxides have a positive effect, because they provide thermal and chemical resistance of the coating [7].…”

Section: Characteristics Of the Tested Coatingssupporting

confidence: 85%

Cavitation erosion and sliding wear resistance of HVOF coatings

Szala

Walczak

2018

Weld. Tech. Rev.

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The aim of the work was to investigate the resistance to cavitation erosion and sliding wear of sprayed HVOF coatings. M(Ni,Co)CrAlY and Cr3C2-NiCr based coatings were deposited using HVOF method onto stainless steel substrate grade AISI 304. As-sprayed coatings’ surface morphology was examined by SEM-EDS and profilometer methods. Cavitationerosion tests were conducted in distilled water with the use of vibratory rig and stationary specimen method. Cavitation erosion curves were plotted as well as cavitational wear mechanism was observed with the use of SEM microscope. Sliding wear tests were performed using the ball-on-disc tribotester with counter-specimen (ball) made of steel 100Cr6. Wearrates and coefficient of friction were computed. Normalized wear resistance with referenceto stainless steel reference sample AISI 304 was calculated. In addition, comparable analysis of wear resistance results was conducted. M(Ni,Co)CrAlY coating presented the highest cavitation erosion resistance, therefore Cr3C2-NiCr coating represented the highest sliding wear resistance of all tested materials.

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Section: Characteristics Of the Tested Coatingssupporting

confidence: 85%

Cavitation erosion and sliding wear resistance of HVOF coatings

Szala

Walczak

2018

Weld. Tech. Rev.

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“…Special attention has been paid to the deposition of composite ceramic, metal-ceramic, and bio-ceramic coatings [10][11][12]. MCrAl coatings (where M = Ni, Co or both) are of particular interest from the point of view of wear and corrosion resistance, but the strength and plasticity of such coatings must be assured as a function of the substrate material [13][14][15][16]. MCrAlbased coatings are widely used as heat-protective coatings that form a protective oxide layer during high-temperature exploitation.…”

Section: Introductionmentioning

confidence: 99%

Structure and Tribological Properties of Ni–Cr–Al-Based Gradient Coating Prepared by Detonation Spraying

et al. 2021

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In this paper, Ni–Cr–Al coatings were deposited using the detonation spraying method. The aim was to investigate how technological parameters influence coating structure formation, phase composition and tribological performances. We observed that the degree to which the barrel is filled with an O2/C2H2 gas mixture strongly influences the chemical composition of manufactured coatings. High degrees of barrel filling led to a decrease in aluminum content in the coating. Filling degrees of 40% and 50% produced sprayed coatings in which only Ni–Cr phases could be found. When the filling degree was reduced up to 25%, Ni–Al phases began to form in the sprayed coatings. Gradient Ni–Cr–Al coatings were produced by gradually reducing the filling degree from 50% to 25%. These coatings are characterized by Ni–Cr near the substrate level with Ni–Cr and Ni–Al phases at higher levels. The results obtained confirm that gradient Ni–Cr–Al coatings exhibit high hardness as well as good wear resistance.

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“…However, despite the HVOF technique being costly, it has high adherence and corrosion resistance with a continuous growth of the Al 2 O 3 layer [24]. Thus, HVOF coating is dense, adherent and contains less oxide with fewer voids and considerably reduces the penetration of oxygen into the TBC from the existing micro-cracks at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation and Effect of Mixed Oxides on TGO Growth in Thick La–Gd–YSZ Thermal Barrier Coating

et al. 2019

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Thick thermal barrier coatings (TBCs) are the main choice in the aviation industry due to their ability to handle elevated temperature exposure in turbines. However, the efficacy of thick TBCs has not been adequate. This study presents a highly durable, thick top-coat (TC) of Lanthanum–gadolinium–yttria stabilized zirconia (La–Gd–YSZ) on high-velocity oxygen fuel (HVOF)-bond coat (HVOF-BC). Crack propagation was quantitatively assessed using a three-dimensional (3D) measuring laser microscope due to higher reliability in calculating the actual crack length of TBC. The findings revealed the HVOF-BC is highly durable with intact structural composition, while the conventional TBC of atmospheric plasma spraying (APS) bond coat (APS-BC) of the same composition and thickness with identical TC was detached at a crack-susceptible zone. The significant enhancement in HVOF-BC is due to the low mixed-oxides growth rate in thermally grown oxide (TGO) with a uniform and dense protective layer of stable Al2O3 which reduces crack propagation. Meanwhile, the failure in APS-BC can be attributed to the high TGO growth rate and thickness with segmented and unstable Al2O3. Furthermore, detrimental mixed oxides such as spinel Ni(Cr,Al)2O4 and NiO lead to disastrous horizontal and compressive cracks. To that end, we study the effect of TGO growth and crack propagation on HVOF-BC TBCs using APS-BC TBCs as a reference.

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Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Cited by 10 publications

References 40 publications

Cavitation erosion and sliding wear resistance of HVOF coatings

Cavitation erosion and sliding wear resistance of HVOF coatings

Structure and Tribological Properties of Ni–Cr–Al-Based Gradient Coating Prepared by Detonation Spraying

Crack Propagation and Effect of Mixed Oxides on TGO Growth in Thick La–Gd–YSZ Thermal Barrier Coating

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