Splat formation and cooling of plasma-sprayed zirconia

Bianchi, L.; Léger, A.C.; Vardelle, Michel; Vardelle, Armelle; Fauchais, Pierre

doi:10.1016/s0040-6090(97)80005-3

Cited by 126 publications

(64 citation statements)

References 15 publications

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“…Preheating Inconel substrates for 3 h at 400°C, then air-cooling to room temperature, reduced the thermal contact resistance by one order of magnitude (R c $ 10 À6 m 2 K/s). The order of magnitude of the thermal contact resistances on each surface is within the range previously determined by Bianchi et al [18].…”

Section: Resultssupporting

confidence: 82%

“…Belghazi et al [17] used a two-dimensional analytical conduction model for the heat transfer in a two-layered material to show that the thermal contact resistance between the layers significantly influenced the surface temperature changes at the interface between the two layers. For plasma-sprayed zirconia on stainless steel, Bianchi et al [18] adjusted the thermal contact resistance values in a numerical model in order to match the experimental cooling rate of zirconia with that of a numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

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Thermal contact resistance between plasma-sprayed particles and flat surfaces

McDonald

Moreau

Chandra

2007

International Journal of Heat and Mass Transfer

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Thermal contact resistance between plasma-sprayed particles and flat surfaces

McDonald

Moreau

Chandra

2007

International Journal of Heat and Mass Transfer

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“…More recently, important efforts have been dedicated to develop a better understanding of the particle impact phenomena, both theoretically and experimentally [2,[35][36][37][38][39][40]. Special efforts were dedicated to the study of the influence of the substrate temperature on particle flattening and solidification.…”

Section: Monitoring Particle Impacts On a Substratementioning

confidence: 99%

Diagnostics for advanced materials processing by plasma spraying

Moreau

Bisson

Lima

et al. 2005

Pure and Applied Chemistry

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Advanced coatings deposited by plasma spraying are used in a large variety of industrial applications. The sprayed coatings are employed typically in industry to protect parts from severe operating conditions or to produce surfaces with specific functions. Applications are found in many industrial sectors such as aerospace, automobile, energy generation, and biomedical implants.Coatings are built by the successive deposition of molten or partially molten particles that flatten and solidify upon contact on the substrate, forming lamellae. The coating properties are intimately linked to the properties of these lamellae, which in turn depend on inflight particle properties as well as substrate temperature during spraying. Consequently, the development of diagnostic tools for monitoring and controlling these spray parameters will help provide the necessary information to study the coating formation process, optimize the coating properties, and, eventually, control the spray process in production.In this paper, a review of some recent developments of optical diagnostic techniques applied to monitor plasma-sprayed particles is presented. In the first part of the paper, two different sensing techniques for in-flight particle measurement are described. First, time-resolved diagnostics on individual particles is described. This technique is used to study the instabilities of the particle characteristics associated with the plasma fluctuations. Secondly, a technique adapted for use in an industrial production environment for measuring the particle jet characteristics as an ensemble is presented. In the second part of the paper, the use of an optical system to study the influence of the substrate temperature on the flattening and solidification of sprayed particles impacting on a flat substrate is described. The last part of this paper describes the optimization of nanostructured coatings based on a tight control of the temperature and velocity of the plasma-sprayed particles.

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“…When the substrate temperature is high, melted particles on the substrate surface tend to remain in liquid phase longer time. 8) So those particles can spread out along with the surface of the previously sprayed coating before solidification. This may result in the dense stacking of flattened splats, then porosity would be lower in the coating.…”

Section: Open Porositymentioning

confidence: 99%

Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

2005

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Zircon is widely used in industrial field as a refractory material, because of its excellent mechanical and chemical properties at high temperature. Authors have been studied on the effect of the heat treatment on the structure and properties of plasma sprayed zircon coating as a candidate for an environmental barrier coating (EBC). In this study, very dense coating with excellent adhesive strength was successfully obtained by optimizing the spray process. Substrate temperature is one of the dominant factors to control porosity and crack formation in the coating. The higher substrate temperature, obtained by plasma pre-heating, resulted in lower porosity and less cracks. Open porosity of the coating was quite low, about 2%, in the coatings obtained especially above 1473 K of the substrate temperature.

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Splat formation and cooling of plasma-sprayed zirconia

Cited by 126 publications

References 15 publications

Thermal contact resistance between plasma-sprayed particles and flat surfaces

Thermal contact resistance between plasma-sprayed particles and flat surfaces

Diagnostics for advanced materials processing by plasma spraying

Structure Control of Plasma Sprayed Zircon Coating by Substrate Preheating and Post Heat Treatment

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