Direct Current Plasma Spraying: Diagnostics and Process Simulation

Vardelle, Armelle; Fauchais, Pierre; Vardelle, Michel; Mariaux, Gilles

doi:10.1002/adem.200600045

Cited by 6 publications

(2 citation statements)

References 40 publications

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“…On the other hand the turbulence is also the cause of the increase of the "externally entrained air and consequently a rapidly decrease of the plasma velocity" (Pfender et al, 1991). It was shown by Bisson et al (2003a) and Vardelle et al (2006), that the plasma turbulence in such PGs is the cause of a high dispersion of particle velocity (of the order of 200 m/s), as well as of particle temperature (of about 600 • C). Bisson et al (2003b) showed experimentally (with Al 2 O 3 powder) that an increase of plasma jet turbulence drastically lowered microstructure quality coating (60% higher porosity, five times higher number of unmelted particles) followed by the considerably lowered deposition efficiency, from 73% to 48%.…”

Section: Plasma Installationmentioning

confidence: 99%

Hydroxyapatite coatings prepared by a high power laminar plasma jet

Vilotijević¹,

Marković²,

Zec³

et al. 2011

Journal of Materials Processing Technology

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Section: Plasma Installationmentioning

confidence: 99%

Hydroxyapatite coatings prepared by a high power laminar plasma jet

Vilotijević¹,

Marković²,

Zec³

et al. 2011

Journal of Materials Processing Technology

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“…The corresponding transient voltage can exhibit a restrike, take-over or mixed mode that leads to voltage fluctuations of ¡35%. 84 The frequency of voltage fluctuations, ranging between 3 and 8 kHz, depends strongly on the condition of the torch anode and its operating parameters. 83 A peak frequency at around 4 kHz is usually observed 85,86 for stick type plasma torches.…”

Section: Fuel Gas Processesmentioning

confidence: 99%

A review of testing methods for thermal spray coatings

Ang

Berndt

2014

International Materials Reviews

165

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The primary focus of this review concerns the test methods used to evaluate thermal spray coatings. Techniques to measure coating intrinsic properties such as (i) porosity and (ii) residual stress state; as well as extrinsic mechanical properties that include (iii) hardness, (iv) adhesion, (v) elastic modulus, (vi) fracture toughness, and (vi) the Poisson's ratio of thermal spray coatings are presented. This review also encompasses the feedstock and thermal spray method since process variants create a specific microstructure. An important aspect of this work is to highlight the extrinsic nature of mechanical property measurements with regard to thermal spray coatings. Thermal spray coatings exhibit anisotropic behaviour and microstructural artefacts such as porosity and the splat structure of coatings influence the mechanical characterisation methods. The analysis of coating data variability evolving from the different measurement techniques is of particular relevance to interpret the character of thermal spray deposits. Many materials can be thermal sprayed but this review focuses on alumina and partially stabilised zirconia since (i) these materials have many proven applications, and (ii) there is a wealth of information that has been reported on these ceramics.

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Effect of Process Parameters on Yttria‐Stabilized Zirconia Particles In‐Flight Behavior and Melting State in Atmospheric Plasma Spraying

Jia,

Wang,

et al. 2024

Adv Eng Mater

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The preparation of coatings by atmospheric plasma spraying gives rise to complex physical processes, which present challenges to the study of plasma jet characteristics and particle in‐flight behavior. Herein, a 3D numerical model that integrates multiple physical phenomena, including electromagnetism and thermal and gas dynamics, to simulate the heating, acceleration, and melting of particles under the thermal–mechanical effect, is developed. Meanwhile, yttria‐stabilized zirconia (YSZ) coatings are prepared under varying process parameters. The DPV‐2000 system is employed for the diagnosis of particle velocity, surface temperature, and diameter. Following comparison, the simulation exhibits errors of 4.5% and 14.8% for the maximum temperature and velocity, respectively. An increase in current intensity from 500 to 600 A results in a rise in the proportion of particles exhibiting temperatures above the melting point (2963 K), from 75.1 to 93.4%, accompanied by an increase in average velocity of ≈16.6%. As the spraying distance increases from 60 to 100 mm, the proportion of particles melting decreases from 93.5 to 66.3%, and the average velocity decreases by ≈9.2%. This work will provide a theoretical foundation for the optimization of process parameters to adjust particle behavior and melting state, thus achieving an optimal spraying effect.

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Direct Current Plasma Spraying: Diagnostics and Process Simulation

Cited by 6 publications

References 40 publications

Hydroxyapatite coatings prepared by a high power laminar plasma jet

Hydroxyapatite coatings prepared by a high power laminar plasma jet

A review of testing methods for thermal spray coatings

Effect of Process Parameters on Yttria‐Stabilized Zirconia Particles In‐Flight Behavior and Melting State in Atmospheric Plasma Spraying

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