Making Dense Coatings with the Solution Precursor Plasma Spray Process

Jordan, Eric H.; Gell, Maurice; Bonzani, P.; Chen, D.; Cetegen, Baki M.; Wu, Fengying; Ma, Xinqing

doi:10.31399/asm.cp.itsc2007p0463

Cited by 8 publications

(4 citation statements)

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“…It can be achieved either with atomizers or by mechanical injection. Different atomizer technologies were used for example by Jordan et al [323]. Figure 34 displays droplet size distributions measured at the systems exit implementing phase Doppler anemometry (PDA) for the different considered technologies.…”

Section: Progress In Surface Treatmentmentioning

confidence: 99%

“…Fluctuating plasma jet are characteristic of Ar-H2 plasma gas mixtures for which voltage fluctuations can be as high as ∆V/V m = 2. Assuming the plasma jet to be quasi-stationary, three major zones can be identified [323,324] (Fig. 37).…”

Section: Progress In Surface Treatmentmentioning

confidence: 99%

“…Three examples will illustrate these applications. First layers obtained with a precursor aqueous solution, exhibiting typical morphologies as the ones depicted in Fig 43a [319,320,323]. They are made of micron-sized lamellae, have grain sizes smaller than 30 nm, exhibit a porous architecture at two scales (nano-and micro-scales) made of voids and through-thickness stress relieving intra-lamellar cracks.…”

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confidence: 98%

“…44. Dense and hard Zirconia coatings deposited by SPPS with an Ar-H 2 plasma using a capillary atomizer [323]. 2.…”

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confidence: 99%

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Thermal and Cold Spray: Recent Developments

Fauchais

Montavon

2008

KEM

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Thermal spraying consists in a technology aiming at producing coatings whose thicknesses range from 10 μm to a few millimeters onto mechanical components to confer them specific and unique functional properties, such as wear and corrosion resistances, friction coefficient adaptation, thermal and electrical insulation, biocompatibility, repair, etc., among the principals. Thermal spraying consists in injecting in a viscous enthalpic jet (animated by a momentum) powder with particles which average size ranges from 0.01 to 100 μm. These particles are melted and simultaneously accelerated towards the surface of the part to be covered. They form, after impact, spreading and solidification, near-circular lamellae the stacking of which form the coating. Due to the versatility of the available processes exhibiting a wide range of enthalpic and momentum contents, virtually any kind of material exhibiting congruent melting behavior can be processed, from alloys and ceramics to polymers, ever since its melting temperature differs from its vaporization or decomposition temperature by at least 300 K and that it can be processed previously under the form of powder particles or wires. Thermal spray techniques offer the unique capability to manufacture a large variety of coatings on components of a large variety and geometry. However, thermal spraying constitutes a special process for which the coating service properties derive mostly from the structure and indirectly from the selection of the operating parameters. Very significant improvements over the past years permitted to diagnose the in-flight particle characteristics, mostly in terms of velocity and temperature. Recently, these new capabilities have made possible the development of on-line process controls. This should participate to a drastic increase in coating reliability. In convetntional thermal spraying processes, a pulverulent feedstock (i.e., powder particles) is injected within the plasma jet via a carrier gas. This approach does not permit to process small diameter particles; i.e., nano-sized particles, which could permit to form finely grained coatings. Replacing gas by liquid to carry particles offer the unique possibility to process nano-sized particles. Cold gas spraying may appear as an alternative process to reach the same goal. Indeed, thermal spray processes experienced very significant developments over the past years, opening new doors to manufacture coatings with a high reliability and superior properties. This papepr indend at presenting some of those developments.

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Section: Progress In Surface Treatmentmentioning

confidence: 99%

Section: Progress In Surface Treatmentmentioning

confidence: 99%

mentioning

confidence: 98%

“…44. Dense and hard Zirconia coatings deposited by SPPS with an Ar-H 2 plasma using a capillary atomizer [323]. 2.…”

mentioning

confidence: 99%

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Thermal and Cold Spray: Recent Developments

Fauchais

Montavon

2008

KEM

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Sprays Used for Thermal Barrier Coatings

Fauchais¹,

Vardelle²,

Vardelle³

et al. 2017

Energy, Environment, and Sustainability

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Parameters Controlling Liquid Plasma Spraying: Solutions, Sols, or Suspensions

et al. 2008

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This article presents what is our present knowledge in plasma spraying of suspension, sol, and solution in order to achieve finely or nano-structured coatings. First, it describes the different plasma torches used, the way liquid jet is injected, and the different measurements techniques. Then, drops or jet fragmentation is discussed with especially the influence of arc root fluctuations for direct current plasma jets. The heat treatment of drops and droplets is described successively for suspensions, sols, and solutions both in direct current or radio-frequency plasmas, with a special emphasize on the heat treatment, during spraying, of beads and passes deposited. The resulting coating morphologies are commented and finally examples of applications presented: Solid Oxide Fuel Cells, Thermal Barrier coatings, photocatalytic titania, hydroxyapatite, WC-Co, complex oxides or metastable phases, and functional materials coatings.

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Making Dense Coatings with the Solution Precursor Plasma Spray Process

Cited by 8 publications

References 0 publications

Thermal and Cold Spray: Recent Developments

Thermal and Cold Spray: Recent Developments

Sprays Used for Thermal Barrier Coatings

Parameters Controlling Liquid Plasma Spraying: Solutions, Sols, or Suspensions

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