HVOF Combustion spraying of inconel powder

Varacalle, D.J.; Ortiz, M. G.; Miller, Craig S.; Steeper, T. J.; Rotolico, A.; Nerz, J. E.; Rlggs, W. L.

doi:10.1007/bf02652023

Cited by 9 publications

(9 citation statements)

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“…The results show that for particles between 10 and 60 m, typically used in thermal spraying applications, particle velocities are in the range between 310 and 860 m/s at a typical spraying distance of 0.254 m. This range of velocities is much higher than the typical velocity of 200 m/s, which can be obtained by plasma spraying. [10,42,43] At this spraying distance, there is a large difference (510 m/s) between the particle velocity for a 10-m particle and that for a 60-m particle. This difference in velocities is equivalent to a kinetic energy per unit mass of the impinging particle, which is one order of magnitude different.…”

Section: B the Effect Of Particle Sizementioning

confidence: 98%

“…All of the solid walls of the nozzle Eq. [10], is implemented. WC-18Co, which consists of 82 wt pct tungsten carbide are assumed at a uniform temperature of 1000 K. This value was selected, by trial and error, in order to satisfy the experiand 18 wt pct cobalt, is chosen as a model particle material.…”

Section: A Gas Dynamicsmentioning

confidence: 99%

“…INTRODUCTION 15,000 K), [9] the particles are made highly plastic by convective heat transfer, and superheating or vaporization of indi-HIGH-VELOCITY oxyfuel (HVOF) thermal spraying vidual particles is prevented. [10] Furthermore, low particle is one of the most significant developments in the thermaltemperatures experienced during the deposition of carbide spray industry since the development of the original plasma coatings lead to less carbide depletion than plasma-sprayed spray technique. It is being used in an increasing variety coatings.…”

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confidence: 99%

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The effect of particle size and morphology on the in-flight behavior of particles during high-velocity oxyfuel thermal spraying

Cheng

Lavernia

et al. 2001

Metall Mater Trans B

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A one-way coupled mathematical model is formulated to simulate the effects of particle size and morphology on the momentum and thermal energy transfer of particles during high-velocity oxyfuel (HVOF) thermal spraying. First, computational fluid dynamic techniques are implemented to solve the Favre-averaged mass, momentum, and energy conservation equations in the gas phase. The gas dynamic data are then used to model the behavior of particles in the gas field. The concept of sphericity is used to incorporate the effect of particle morphology into the model. The calculated results show that the particle velocity and temperature, before impinging onto the substrate, are strongly affected by particle size, morphology, and spray distance. Smaller particles are accelerated to a higher velocity but slowed down rapidly due to their smaller momentum inertia, while the larger particles are accelerated with some difficulty. The same tendency is observed regarding the effect of particle size on its thermal history.

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Section: B the Effect Of Particle Sizementioning

confidence: 98%

Section: A Gas Dynamicsmentioning

confidence: 99%

mentioning

confidence: 99%

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The effect of particle size and morphology on the in-flight behavior of particles during high-velocity oxyfuel thermal spraying

Cheng

Lavernia

et al. 2001

Metall Mater Trans B

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“…They indicated that a longer spraying time was regained to accomplish repair work on the intended component compared to other due to hardened initiated surface. HVOF combustion spraying of nickel‐titanium powder was studied by Varacalle et al (1992). They indicated that oxide content in the coating was lowered by changing spray distance and the lower air flow.…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of HVOF sprayed Inconel 625 coatings subjected aqueous corrosion

Boudi

Hashmi

Yilbaş

2006

Industrial Lubrication and Tribology

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PurposeTo examine the tensile properties of high velocity oxy‐fuel (HVOF) sprayed Inconel 625 coating of steel substrate before and after the aqueous corrosion.Design/methodology/approachWorkpieces were cut from steel sheets. After chemical and ultrasonic cleaning, workpiece surfaces were sand blasted and HVOF sprayed Inconel 625 coated. The coated and un‐coated surfaces were subjected to the aqueous corrosion tests for one and three weeks. After the completion of the corrosion tests, tensile properties of the workpieces were examined.FindingsThe workpieces subjected to a three weeks static corrosion environment fail at a lower load than the untreated workpiece due to high stiffness. The defect sites in the coating and at the interface act as stress risers and contribute substantially crack initiation and propagation in the coating. Under increasing tensile load in the plastic region, the substrate material can no longer support the coating. This results in extended cracking and gradually spalling of the coat. When the local critical stress for crack propagation is reached, elongated cracks occur, which in turn initiates splitting separation between the adjacent zones in the coating. The shear deformation of the adjusted zones results in the total failures of the coating.Research limitations/implicationsThe tests can be extended to include the duplex treated workpieces such as the laser treatment of surface after HVOF sprayed coating. This enhances the bonding of the coating through thermal integration of the coating and the base substrate material.Practical implicationsThe results can be used to assess the HVOF sprayed coatings.Originality/valueThis paper provides information on mechanical behavior of HVOF sprayed coating when subjected to the tensile force and offers practical help for the researchers and scientists working in the coating area.

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“…When burned in conjunction with pure oxygen, these fuels can produce a nominal gas temperature greater than 3029 K. The powder particles are injected axially into the jet gas, heated, and propelled toward the substrate. With the relatively low temperatures of the flame gas associated with the HVOF systems, superheating or vaporization of individual particles are often prevented [8]. Furthermore, the lower particle temperatures present lead to carbide coatings that exhibit less carbide loss than that of the plasma sprayed coatings.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nanocomposite Coatings

Ice

Lavernia

2000

Nanostructured Films and Coatings

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The synthesis of nanocomposite coatings is described in this paper. The nanocomposite feedstock powders are synthesized using mechanical milling, and the characteristics of the milled powders, i.e., morphology, agglomeration behavior, powder size, grain size and structural evolution during milling, are analyzed using X-ray diffraction, SEM and TEM. Using high velocity oxygen fuel (HVOF) spraying, the nanocomposite coatings are sprayed, and the microstructures and properties of the resulting coatings are characterized.

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HVOF Combustion spraying of inconel powder

Cited by 9 publications

References 0 publications

The effect of particle size and morphology on the in-flight behavior of particles during high-velocity oxyfuel thermal spraying

The effect of particle size and morphology on the in-flight behavior of particles during high-velocity oxyfuel thermal spraying

Tensile properties of HVOF sprayed Inconel 625 coatings subjected aqueous corrosion

Synthesis and Characterization of Nanocomposite Coatings

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