Plasma Spraying Using Ar-He-H&lt;SUB&gt;2&lt;/SUB&gt; Gas Mixtures

Janisson, S.; Meillot, E.; Vardelle, Armelle; Coudert, Jean-François; Pateyron, Bernard; Fauchais, Pierre

doi:10.1361/105996399770350232

Cited by 48 publications

(21 citation statements)

References 7 publications

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“…Paik et al (6) employed Steenbeck's Minimum Principle to simulate the plasma flow in the arc channel region and found that the anode arc root position will transfer further downstream with the increase of gas flow rate or the decrease of arc current. S. Janisson et al (7) studied the relation between the arc voltage and the spraying parameters and found the same tendency.…”

Section: Introductionmentioning

confidence: 70%

Effect of Anode Arc Root Position on the Behavior of the DC Non-transferred Plasma Jet at Field Free Region

Gao

Sun

et al. 2005

Plasma Chem Plasma Process

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A special bi-anode plasma torch that can change the anode arc root position without changing working gas flow rate has been developed to investigate the effect of anode arc root position on the behavior of the plasma jet. It has two nozzle-shaped anodes at different axial distances from the cathode tip. The arc root can be formed at anodes either close to the cathode tip (anode I) or far away from it (anode II) to obtain different attachment positions and arc voltages. The characteristics of pure argon plasma jets operated in different anode modes were measured in the field free region by using an emalpy probe, and the thermal efficiency of the torch was determined by measuring the temperature differences between cooling water flowing in and out of the torch. The results show that compared with the normal arc operated in anode I mode, the elongated arc operated in anode II mode significantly reduced the plasma energy loss inside the torch, resulting in a higher temperature and a higher velocity of the plasma jet in the field free region.

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Section: Introductionmentioning

confidence: 70%

Effect of Anode Arc Root Position on the Behavior of the DC Non-transferred Plasma Jet at Field Free Region

Gao

Sun

et al. 2005

Plasma Chem Plasma Process

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“…The arc behavior in the plasma jet has been the subject of numerous experimental studies ( Ref 1,2,[9][10][11][12][13][14]. The fast Fourier transform (FFT) method has been widely used for the analysis of electrical, optical, and acoustical signals to reflect local or global manifestations of arc fluctuations.…”

Section: Methodsmentioning

confidence: 99%

A Novel Single Cathode Plasma Column Design for Process Stability and Long Component Life

Mohanty

George

Pollard³

et al. 2009

J Therm Spray Tech

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This paper investigates a novel single cathode plasma column design consisting of a patented arc constrictor and its impact on process stability, versatility, and component life. The design aims to minimize the re-strike of arc, increase the arc length enabling high voltage and low amp operation as well as the use of ternary gas combination to increase the enthalpy. The arc unsteadiness and dynamic behavior are investigated through the fluctuations of electrical signals. Further, the particle velocity and temperature have been characterized by commercial diagnostics systems. The takeover/steady mode appears to be the typical operational mode of the plasma jet in this design. Low amplitude and high frequency fluctuations resulted in steady particle characteristics. Further, the design allowed the gun to operate at very high plasma velocities reaching the characteristics of an HVOF jet. The significance of the design is demonstrated through operational flexibility and stability.

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“…For example, a flow rate of 30 slm of argon (0.89 g/s) will result in good operating conditions, while a flow rate of 30 slm of hydrogen (0.045 g/s) for the same torch will result in rapid or very rapid erosion of the anode. Increasingly, ternary gas mixtures are being used as plasma gases, such as Ar-H 2 -N 2 or Ar-H 2 -He, to tailor the plasma properties for optimal heat and momentum transfer to the particles while keeping electrode erosion at acceptable levels [1,3].…”

Section: Equipment and Operating Parametersmentioning

confidence: 99%