Effect of Plasma Fluctuations on In-Flight Particle Parameters

Bisson, Jean‐François; Gauthier, Bruno; Moreau, Christian

doi:10.1361/105996303770348483

Cited by 83 publications

(38 citation statements)

References 13 publications

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“…a few tens of micrometers in diameter), cannot follow the arc root fluctuations that are in the few kilohertz range. Therefore, the average particle trajectory fluctuates accordingly and, the temperature and velocity of the particles fluctuate at the same frequency as that of the arc root Bisson et al (2003). The effect on the micrometer-sized coating morphologies can be rather important: i.e, less dense and more porous coatings are obtained with highly fluctuating plasma jets than those obtained with more stable plasma jets with the same enthalpy.…”

Section: Conventional Direct Current Plasma Torchesmentioning

confidence: 99%

Solution and Suspension Plasma Spraying of Nanostructure Coatings

Fauchais¹,

Vardelle²

2012

Advanced Plasma Spray Applications

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Section: Conventional Direct Current Plasma Torchesmentioning

confidence: 99%

Solution and Suspension Plasma Spraying of Nanostructure Coatings

Fauchais¹,

Vardelle²

2012

Advanced Plasma Spray Applications

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“…Recently, the system was used to investigate the influence of the plasma fluctuations on the characteristics of the in-flight particles [22,23]. Plasma fluctuations result from the movement of the arc root on the anode surface driven by the hydrodynamic and electromagnetic forces acting on the arc itself.…”

Section: Monitoring Of Individual In-flight Particlesmentioning

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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“…In an elegant experiment, Bisson et al [99] showed the effect of voltage fluctuations on particle temperatures and velocities. A comparator was used to generate a signal when the voltage reached a certain threshold value in a restrike-like mode of operation.…”

Section: Effect Of Arc Voltage Fluctuations On Plasma Jet and Particlmentioning

confidence: 99%