Structural and Thermal Behavior of Fe-Cr-Mo-P-B-C-Si Amorphous and Nanocrystalline HVOF Coatings

Movahedi, B.; Enayati, M.H.; Wong, Chee Cheong

doi:10.1007/s11666-010-9507-y

Cited by 41 publications

(11 citation statements)

References 32 publications

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“…Figure 2 depicts a SEM micrograph of precursor powder particles which present an irregular morphology type blocky as well as a nonsmooth surface. The size of powder particles is less than 100 m. This morphology was previously observed on the amorphous powder consolidated by mechanical alloying as shown by Movahedi et al [16]. Figure 3 shows the XRD pattern of the 140 MXC precursor powder.…”

Section: Wear Test Friction and Wear Test Was Performed Onsupporting

confidence: 63%

“…These coatings have been deposited by high-velocity oxygen fuel (HVOF) and gas tunnel type plasma spraying techniques [13][14][15]. Movahedi et al [16] produced an amorphous feedstock powder Fe-based by mechanical alloying with high glass forming ability (GFA) and they developed amorphous-nanocrystalline coatings by adjusting spraying of HVOF parameters. However, this process presents the disadvantages of high complexity caused by the large number of processing variables during the operation, high cost of the added powders, and the formation of large agglomerates/precipitates of the dispersive phase in the coating.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization and Wear Properties of Fe-Based Amorphous-Crystalline Coating Deposited by Twin Wire Arc Spraying

Morquecho

Campa-Castilla

Leyva‐Porras

et al. 2014

Advances in Materials Science and Engineering

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Twin wire arc spraying (TWAS) was used to produce an amorphous crystalline Fe-based coating on AISI 1018 steel substrate using a commercial powder (140MXC) in order to improve microhardness and wear properties. The microstructures of coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) as well as the powder precursor. Analysis in the coating showed the formation of an amorphous matrix with boron and tungsten carbides randomly dispersed. At high amplifications were identified boron carbides at interface boron carbide/amorphous matrix by TEM. This kind of carbides growth can be attributed to partial crystallization by heterogeneous nucleation. These interfaces have not been reported in the literature by thermal spraying process. The measurements of average microhardness on amorphous matrix and boron carbides were 9.1 and 23.85 GPa, respectively. By contrast, the microhardness values of unmelted boron carbide in the amorphous phase were higher than in the substrate, approaching 2.14 GPa. The relative wear resistance of coating was 5.6 times that of substrate. These results indicate that the twin wire arc spraying is a promising technique to prepare amorphous crystalline coatings.

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Section: Wear Test Friction and Wear Test Was Performed Onsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization and Wear Properties of Fe-Based Amorphous-Crystalline Coating Deposited by Twin Wire Arc Spraying

Morquecho

Campa-Castilla

Leyva‐Porras

et al. 2014

Advances in Materials Science and Engineering

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“…Furthermore, a few pores are visible in the coating. Some large pores mainly result from the local detached packed structure or gas entanglement circumstance, while pores with a smaller size are caused by volume shrinkage between flattened particles [23]. A small number of heterogeneities are also detected occasionally.…”

Section: Microstructural Observations Of Fecrmocby Amorphous Coatingmentioning

confidence: 99%

Time-Dependent Passivation Performance of Plasma Sprayed FeCrMoCBY Amorphous Coating

Wang

Zhou

et al. 2023

Coatings

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The relationship between passive film growth behavior and passivation time for plasma-sprayed Fe48Cr15Mo14C15B6Y2 amorphous coating in borate buffer solution has been thoroughly studied. The morphological characteristic and structural feature of as-spayed amorphous coating were estimated by scanning electron spectroscopy (SEM), X-ray diffraction (XRD) and transmission electron spectroscopy (TEM). The influence of passivation time on the film evolution properties was measured by electrochemical impedance spectra (EIS), Mott–Schottky curves, atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS). The results revealed that both corrosion resistance and self-repairing capacity of passive film greatly increased with time based on high electric field assumption. Reductions in donor density and flat band potential were accountable for a lower conductivity of passive film. An increment in Cr2O3 oxide as the inner barrier layer derived from the dehydration reaction of Cr(OH)3 contributed to the gradually densified structure of passive film. The extracted passive film thickness d increment with passivation time t conformed to the logarithm law on the basis of effective capacitance hypothesis: d=0.43lnt+52.06−2.18 (nm). Passivation mechanism within 600 s was ascribed to the adsorption of mechanical mixtures between metal ions and electrolytes, possibly leading to mechanical stress and rupture of passive film in the later growth procedure. The cation vacancy condensation process at the interface of coating/film was propitious in stabilizing the growth rate of passive film.

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“…10,11 For Fe-Cr-Mo-P-B-C-Si amorphous coatings, oxygen flow rate of HVOF coating process has direct correlation with mechanical properties. 12 Rajasekaran et al. 13 developed thick coating layer using HVOF process and studied about the process parameter affecting the performance of coating materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of HVOF spraying parameters on fracture, erosion and thermal properties of Fe alloy-based coating materials

Sharma

Das

Kumar

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Fe-based coating (Fe50Mo5C15Si10Cr10Ti10) was deposited on 316L stainless steel substrate by high-velocity oxy-fuel spraying coating process. High-velocity oxy-fuel spraying process parameters such as oxygen flow rate and spray distance were varied to investigate their effect on mechanical, wear and thermal properties. The prepared coatings were characterized in terms of mechanical properties such as micro-hardness and fracture toughness, thermal properties and erosion wear properties. X-ray diffraction analysis showed presence of hardened phase Fe2Ti and Fe-Cr. Results of this study indicated that increase in oxygen flow rate from 200 to 250 slpm improved the fracture toughness and micro-hardness by 33% and 6.7%, respectively. On the other hand, increase in spray distance decreased the fracture toughness and micro-hardness by 27.2% and 6.7%, respectively. The wear rate was increased with the increase in oxygen flow rate and decreased with the increase in spray distance. The erosion wear rate was more dependent on fracture toughness as compared to micro-hardness.

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Structural and Thermal Behavior of Fe-Cr-Mo-P-B-C-Si Amorphous and Nanocrystalline HVOF Coatings

Cited by 41 publications

References 32 publications

Microstructural Characterization and Wear Properties of Fe-Based Amorphous-Crystalline Coating Deposited by Twin Wire Arc Spraying

Microstructural Characterization and Wear Properties of Fe-Based Amorphous-Crystalline Coating Deposited by Twin Wire Arc Spraying

Time-Dependent Passivation Performance of Plasma Sprayed FeCrMoCBY Amorphous Coating

Effect of HVOF spraying parameters on fracture, erosion and thermal properties of Fe alloy-based coating materials

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