New Plasma Gun Technology

Bernecki, Thomas F.

doi:10.4271/870743

Cited by 2 publications

(2 citation statements)

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“…In the last few decades a couple of new plasma torch designs have emerged, each aiming to extend the length of the arc and hence to generate a plasma jet with a higher temperature homogeneity and a better voltage-current working regime. Metco Co achieved it with the so-called APG construction by mechanically separating the cathode from the anode upon ignition of the plasma [4], and Osram Sylvania Inc. did so by inserting an 'inter-electrode' between the cathode and the anode [5]. In the latter construction, the diameter of the cylindrical anode nozzle was larger than the diameter of the cylindrical 'inter-electrode' opening, and additional gas was injected at the zone of contact of the two nozzles for fixation of the anodic arc root.…”

Section: Introductionmentioning

confidence: 99%

Velocity and texture of a plasma jet created in a plasma torch with fixed minimal arc length

Vilotijević¹,

Dacic²,

Božić³

2009

Plasma Sources Sci. Technol.

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A new plasma jet (PJ-100) plasma spraying torch with a fixed minimal arc length was tested and the basic working parameters were measured and evaluated. The velocity of the plasma exiting both the cylindrical and the conical anode nozzles was assessed by measuring the thrust generated by the plasma jet and by photographing the translation of plasma clouds (parts with different brightnesses) in the last third of the length of the plasma plume. The basic characteristics of the argon/hydrogen plasma jets (enthalpy, mean temperature, mean plasma velocity and effective exhaust thrust velocity) were determined for different working regimes, for both the cylindrical and the conical nozzles. The thermal efficiency of the new plasma torch is between 70% and 74% for the plasma generation power up to 90 kW. The plasma plume generated in the cylindrical nozzle has a homogeneous radial temperature (and velocity) distribution with a full laminar flow.

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Section: Introductionmentioning

confidence: 99%

Velocity and texture of a plasma jet created in a plasma torch with fixed minimal arc length

Vilotijević¹,

Dacic²,

Božić³

2009

Plasma Sources Sci. Technol.

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“…The use of powders manufactured to be near monosized proved the validity of the concept. [7] SPPS can inherently handle powders with a wider size distribution through particle segregation associated with the aerodynamics of the injector. Generally, coating quality is reduced due to the presence of particles with off-design diameters in the mantle of the plasma.…”

Section: Introductionmentioning

confidence: 99%

In Situ Characterization of Small-Particle Plasma Sprayed Powders

Su¹,

Bernecki

Faber³

2002

Journal of Thermal Spray Technology

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The effect of various small-particle plasma spray powder injection parameters on the in situ particle position, velocity, and temperature is measured for yttria-stabilized zirconia and yttrium-aluminum-garnet powder. Using full-factorial experiments and multiple regression analysis, carrier gas flow, injector angle, and powder feeder disc speed were found to significantly affect the particle properties. Temperature and velocity were inversely related; on average, the cooler particles traveled faster. These properties also correlated to the particle position in the flame, where particles above the centerline of the flame traveled faster. The trends are discussed on the basis of residence time in the flame, as well as in terms of particle size segregation effects. Coating density and splat geometry reflect the temperature and velocity differences between the runs. Slower, hotter particles possessed more intrasplat and intersplat porosity and less splat-substrate contact area, leading to lower overall coating density.

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New Plasma Gun Technology

Cited by 2 publications

References 0 publications

Velocity and texture of a plasma jet created in a plasma torch with fixed minimal arc length

Velocity and texture of a plasma jet created in a plasma torch with fixed minimal arc length

In Situ Characterization of Small-Particle Plasma Sprayed Powders

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