Effects of Fuel Types and Process Parameters on the Performance of an Activated Combustion High Velocity Air-Fuel (AC-HVAF) Thermal Spray System

Gao, Xing; Chang, Li; Xu, Yan; Chen, Xinxue; Han, Xing

doi:10.1007/s11666-021-01250-7

Cited by 22 publications

(8 citation statements)

References 31 publications

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“…The dimensions and other necessary assumptions were based on the investigation of Gao et al, , in which a CFD study was carried out using a spray gun supplied by Kermetico, Inc., which was identical with the current study. A schematic of the HVAF method is shown in Figure c.…”

Section: Methodsmentioning

confidence: 99%

“…For modeling turbulence, the RNG k– ε turbulence model with standard wall functions was used in this work. Equations to are the steady-state equations in the Cartesian tensor form . The RNG k – ε turbulence model produces nonphysical turbulent viscosities in rotating and stationary fluid zones, which does not agree with the Reynold stresses…”

Section: Methodsmentioning

confidence: 99%

“…Equations 5 to 11 are the steadystate equations in the Cartesian tensor form. 41 The RNG k−ε turbulence model produces nonphysical turbulent viscosities in rotating and stationary fluid zones, which does not agree with the Reynold stresses. 44 Mass conservation:…”

mentioning

confidence: 98%

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An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

Jagadeeshanayaka,

Kele,

Jambagi

2023

Langmuir

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

Jagadeeshanayaka,

Kele,

Jambagi

2023

Langmuir

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“…Secondly, the reaction in the combustion chamber produces high-temperature and high-pressure gas, heating and accelerating the powder injected into the process via N2 gas. Lastly, the gas flow is further accelerated to supersonic speeds through a divergent nozzle [2], depositing molten and semi-molten powder particles onto the substrate and providing a protective coating [3]. [2].…”

Section: Brief Introduction To Hvaf Coatingsmentioning

confidence: 99%

High-velocity air fuel coatings for steel for erosion-resistant applications

Avcu

Güney

Avcu

2022

J. Electrochem. Sci. Eng.

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High-velocity air fuel (HVAF) coating processes have advantages over conventional high-velocity oxygen fuel (HVOF) processes, resulting in coatings with superior properties. The present review first provides a concise overview of HVAF coatings, highlighting their advantages over HVOF coatings. Then, the fundamentals of solid particle, slurry, and cavitation erosion are briefly introduced. Finally, the performance of HVAF coatings for erosion-resistant applications is discussed in detail. The emerging research consistently reports HVAF-coatings having higher erosion resistance than HVOF-coatings, which is attributed to their elevated hardness and density and improved microstructural features that inhibit the surface damages caused by erosion. The dominant wear mechanisms are mainly functions of particle impact angle. For instance, the removal of the binder phase at high impact angles causes the accumulation of plastic strain on hard particles (e.g., WC particles) in the matrix, forming micro-cracks between the hard particles and the matrix, eventually decreasing the erosion resistance of HVAF coatings. The binder phase of HVAF-coatings significantly affects erosion resistance, primarily due to their inherent mechanical properties and bearing capacity of hard particles. Optimizing spraying parameters to tailor the microstructural characteristics of these coatings appears to be the key to enhancing their erosion resistance. The relationship between microstructural features and erosion mechanisms needs to be clarified to process coatings with tailored microstructural features for erosion-resistant applications.

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“…Another disadvantage of this method is the porosity of the formed coating, although it is significantly lower compared to other thermal spraying methods (e.g., TWAS-Twin Wire Arc Spraying, APS-Atmospheric Plasma Spraying) [17][18][19]. Good properties of chrome coatings have been achieved using the HVAF (High Velocity Air-Fuel) method [20][21][22][23][24], which can also be used as an alternative to hard chrome plating. Currently, CS (Cold Spray) technology is coming to the fore, which can be used to replace hard chrome with alternative surface processes or to produce a hard chrome layer without the use of Cr6 [25][26][27].…”

mentioning

confidence: 99%

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

et al. 2022

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The article deals with the replacement of hard chrome plating by applying the duplex system plasma nitriding + CrN coating (hereinafter referred to as PN + CrN). The goal of the research was to find a suitable alternative for steel surface treatment that would replace hard chrome plating and ensure similar mechanical and tribological properties. An exposed part of a small-bore weapon was selected for evaluation, namely the gas piston of the 42CrMo4 steel breech mechanism drive. The PN + CrN duplex system was compared with a hard chrome coating as well as a self-deposited CrN coating. The mentioned surface treatments were evaluated in terms of metallography, mechanical and tribological properties and surface texture. From the mechanical properties, the hardness of the surface was analyzed, an indentation test was performed (Mercedes test) and adhesive-cohesive behavior was evaluated (Scratch test). Furthermore, an instrumented penetration test was performed (an evaluation of plastic and elastic deformation work and indentation hardness). As part of the assessment of tribological properties, the Ball-on-Flat test, the measurement of the coefficient of friction and the measurement of traces of wear were performed. The surface texture was evaluated in terms of morphology and surface roughness measurement by selected 2D and 3D parameters. The PN + CrN duplex system showed higher hardness than hard chrome, better tribological properties (lower friction coefficient), but worse surface texture. The PN + CrN duplex system has proven to be a suitable alternative to the hard chrome coating for exposed parts of small-caliber weapons, which can be applied in arms production.

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Effects of Fuel Types and Process Parameters on the Performance of an Activated Combustion High Velocity Air-Fuel (AC-HVAF) Thermal Spray System

Cited by 22 publications

References 31 publications

An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

High-velocity air fuel coatings for steel for erosion-resistant applications

Possibilities of Using the Duplex System Plasma Nitriding + CrN Coating for Special Components

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