Development, optimization, and characterization of NiCrBSi-TiB2 flame-sprayed vacuum fused coatings

Kazamer, Norbert; Vălean, P. C.; Pascal, D. T.; Muntean, Roxana; Mărginean, Gabriela; Şerban, Viorel Aurel

doi:10.1016/j.surfcoat.2020.126747

Cited by 22 publications

(8 citation statements)

References 31 publications

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“…Lately, vacuum furnaces have been considered for heat treatments, as they can offer service stability due to the nature of the processing environment, possibility of handling parts with complex geometries, and relatively low costs, with a short recoupment period [11]. A controlled atmosphere helps to significantly improve the quality of the surface coating by realizing gas extraction, eliminating pores, and offering reproducible results [12,13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Ni-Based Self-Fluxing Remelted Coatings for Wear and Corrosion Applications

Kazamer¹,

Muntean

Vălean

et al. 2021

Materials

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The present study investigates the possibility to apply a vacuum furnace thermal post-treatment as an alternative solution for flame sprayed NiCrBSi wear and corrosion-resistant coatings, deposited on a low alloyed structural steel. The controlled atmosphere offers advantages regarding the fusion of the coating, porosity reduction, and degassing. An improvement of the applied heating-cooling cycle was performed through the variation of time and temperature. The best performing samples were selected by comparing their porosity and roughness values. The chosen samples were subsequently characterized regarding their microstructure, microhardness, sliding wear, and corrosion behavior. The experimental work confirms that the use of a vacuum remelting post-process reduces the porosity below 1% and leads to the formation of a larger quantity of hard boron-containing phases, promoting a significant decrease of the wear rate, while maintaining a good corrosion behavior.

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Section: Introductionmentioning

confidence: 99%

Comparison of Ni-Based Self-Fluxing Remelted Coatings for Wear and Corrosion Applications

Kazamer¹,

Muntean

Vălean

et al. 2021

Materials

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“…Borides being one of the most essential and commonly used refractory materials in the industry can also be reinforced with nickel chrome boron silicium to be used as the feedstock for the improvement in the wear resistance of nickel chrome boron silicium-based coatings [23]. Numerous advantages like enhanced tribological and mechanical properties of such coatings can be obtained over the nickel chrome boron silicium coatings and uncoated ones.…”

Section: Introductionmentioning

confidence: 99%

Deposition and characterization of high velocity oxy‐fuel sprayed nickel chrome boron silicium based coatings on stainless steel substrates

Pandey,

Nayak,

Satapathy

et al. 2024

Materialwissenschaft Werkst

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After plasma spraying, high‐velocity‐oxy‐fuel (HVOF) spraying is fast emerging as the most versatile deposition technique for thermal sprayed protective coatings. In this context, the present work aims at the deposition of a class of inter‐metallic/cermet coatings of nickel chrome boron silicium (NiCrBSi) and nickel chrome boron silicium+titanium diboride (TiB2) on 304 stainless steel substrates using high‐velocity oxy‐fuel spraying route. The cermet powder is prepared as the feedstock by mechanical mixing of the powders prior to spraying. Different coating samples are obtained by varying the flame‐to‐substrate spray distance (40 mm, 80 mm, 120 mm, 160 mm and 200 mm). These coatings are characterized in terms of their adhesion strength, deposition efficiency, thickness, and micro‐hardness by conducting tests as per the ASTM standards. The surface and interface morphologies of the deposited coatings are studied using scanning electron microscopy. The possible phases present in the coatings, and the transformation of phases during deposition have been explored by x‐ray diffraction analysis. It is found that the coatings exhibit fairly good interfacial adhesion, micro‐hardness, and thickness values that varied significantly with the spray‐distance. Further, the premixing of titanium diboride in nickel chrome boron silicium improved the mechanical and microstructural/compositional properties of the coatings.

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“…The relationship between the dry sliding wear of the coatings and the wear distance, wear rate, and the hardness of the coating surface was investigated. Recently, a new coating preparation method that uses vacuum brazing cladding and flexible coating cloth technology has been employed [9][10][11][12][13]. Flexible coating cloth technology involves the use of a metal powder including hard metal, bonded metal, and organic binder after mixing, which is then rolled into a dense metal cloth via a machine.…”

Section: Introductionmentioning

confidence: 99%

Effects of different carbides content and brazing process on the electrochemical behaviour of vacuum brazed WC-10Ni+NiCrBSi coatings

Zhu,

Liu,

Yuan

et al. 2023

Phys. Scr.

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This study prepared a WC-10Ni/NiCrBSi composite coating on Q235 steel employing flexible coating cloth and vacuum brazing technologies. The surface hardness and corrosion resistance of the coating were characterised by the Vickers hardness, electrochemical, and micro-electrochemical tests. The results show that the corrosion resistance of the coating improved with the increase in cladding temperature. Moreover, with the increase in WC-10Ni content, the corrosion resistance of the coating decreased. Through transmission electron microscopy, scanning electron microscopy, and energy dispersive spectroscopy analysis, it is shown that there is galvanic corrosion in the micro-zone corrosion, where the WC particles are protected as cathodes, and the hardness of the coating is not affected by electrochemical behaviour. Thus, the hardness of the coating is not affected when it is applied in a corrosive environment.

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Development, optimization, and characterization of NiCrBSi-TiB2 flame-sprayed vacuum fused coatings

Cited by 22 publications

References 31 publications

Comparison of Ni-Based Self-Fluxing Remelted Coatings for Wear and Corrosion Applications

Comparison of Ni-Based Self-Fluxing Remelted Coatings for Wear and Corrosion Applications

Deposition and characterization of high velocity oxy‐fuel sprayed nickel chrome boron silicium based coatings on stainless steel substrates

Effects of different carbides content and brazing process on the electrochemical behaviour of vacuum brazed WC-10Ni+NiCrBSi coatings

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