Influence of Helmholtz oscillations on arc voltage fluctuations in a dc plasma spraying torch

2007 ◽  
Vol 40 (23) ◽  
pp. 7357-7366 ◽  
Author(s):  
J F Coudert ◽  
V Rat ◽  
D Rigot
Keyword(s):  
Plasma Spraying ◽  
Voltage Fluctuations ◽  
Dc Plasma ◽  
Arc Voltage

scholarly journals The Influence of Anode Inner Contour on Atmospheric DC Plasma Spraying Process

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Kui Wen ◽  
Min Liu ◽  
Kesong Zhou ◽  
Xuezhang Liu ◽  
Renzhong Huang ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Thermal Efficiency ◽  
Plasma Jet ◽  
Measured Temperature ◽  
Arc Voltage ◽  
Cylindrical Nozzle ◽  
Jet Characteristics ◽  
Plasma Spraying Process ◽  
Spraying Process ◽  
Plasma Jet Characteristics

In thermal plasma spraying process, anode nozzle is one of the most important components of plasma torch. Its inner contour controls the characteristics of plasma arc/jet, determining the motion and heating behaviors of the in-flight particles and hence influencing the coating quality. In this study, the effects of anode inner contour, standard cylindrical nozzle, and cone-shaped Laval nozzle with conical shape diverging exit (CSL nozzle) on the arc voltage, net power, thermal efficiency, plasma jet characteristics, in-flight particle behaviors, and coating properties have been systematically investigated under atmospheric plasma spraying conditions. The results show that the cylindrical nozzle has a higher arc voltage, net power, and thermal efficiency, as well as the higher plasma temperature and velocity at the torch exit, while the CSL nozzle has a higher measured temperature of plasma jet. The variation trends of the plasma jet characteristics for the two nozzles are comparable under various spraying parameters. The in-flight particle with smaller velocity of CSL nozzle has a higher measured temperature and melting fraction. As a result, the coating density and adhesive strength of CSL nozzle are lower than those of cylindrical nozzle, but the deposition efficiency is greatly improved.

Chromium-nitride in situ composites with a compositional gradient formed by reactive DC plasma spraying

1996 ◽  
Vol 5 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Y. Tsunekawa ◽  
M. Okumiya ◽  
T. Kobayashi ◽  
M. Okuda ◽  
M. Fukumoto
Keyword(s):  
Plasma Spraying ◽  
Chromium Nitride ◽  
Compositional Gradient ◽  
Dc Plasma ◽  
In Situ Composites

Understanding of suspension DC plasma spraying of finely structured coatings for SOFC

2005 ◽  
Vol 33 (2) ◽  
pp. 920-930 ◽  
Author(s):  
P. Fauchais ◽  
V. Rat ◽  
C. Delbos ◽  
J.F. Coudert ◽  
T. Chartier ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Dc Plasma

ChemInform Abstract: Nanomaterial Deposits Formed by DC Plasma Spraying of Liquid Feedstocks.

ChemInform ◽  
2010 ◽  
Vol 29 (21) ◽  
pp. no-no
Author(s):  
J. KARTHIKEYAN ◽  
C. C. BERNDT ◽  
S. REDDY ◽  
J.-Y. WANG ◽  
A. H. KING ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Dc Plasma
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