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plasma jet flow

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Proceedings Papers

ITSC 2021, Thermal Spray 2021: Proceedings from the International Thermal Spray Conference, 542-547, May 24–28, 2021,
... modelling plasma jet flow surface topography suspension plasma spraying thermal barrier coatings Thermal Spray 2021: Proceedings from the International Thermal Spray Conference Copyright © 2021 ASM International® May 24 28, 2021 All rights reserved. F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B...
Proceedings Papers

ITSC1996, Thermal Spray 1996: Proceedings from the National Thermal Spray Conference, 553-561, October 7–11, 1996,
... of metal particles. The jet instabilities are in part caused by the swirl flow of the plasma gas. With two modifications to an atmospheric pressure plasma spray torch, we have investigated the influence of reduced swirl flow on jet stability, particle trajectories, and coating quality. The modifications...
Proceedings Papers

ITSC1997, Thermal Spray 1997: Proceedings from the United Thermal Spray Conference, 775-782, September 15–18, 1997,
.... This paper is devoted to the study of the metallic surface. The substrate heating and thus oxidation are obtained with a d.c. Ar-H 2 plasma jet flowing in air of which the stand off distance is maintained at 100 mm. The parameters investigated are macroscopic surface temperature and heating time...
Proceedings Papers

ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 809-814, May 25–29, 1998,
... than that of Ar/H, mixtures, limiting the turbulence in the jet fringes and pumping of the surrounding atmosphere. air plasma spraying Ar-H2 mixtures Ar-H2-He mixtures flow oxidation control plasma composition temperature distribution velocity distribution Thermal Spray: Meeting...
Proceedings Papers

ITSC1997, Thermal Spray 1997: Proceedings from the United Thermal Spray Conference, 557-565, September 15–18, 1997,
... fluid dynamics DC plasma jet gas flow rate plasma spraying Thermal Spray: A United Forum for Scientific and Technological Advances: Copyright © 1997 ASM International® Proceedings of the 1st United Thermal Spray Conference All rights reserved. C.C. Berndt, editor, p 557-565...
Proceedings Papers

ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 887-894, May 25–29, 1998,
... and computational study of the influence of injector geometry and gas mass flow rate on particle dynamics at injector exit and in the plasma jet. Two injector geometries were tested: a straight tube and a curved tube with various radii of curvature. Zirconia powders with different particle size range and morphology...
Proceedings Papers

ITSC2000, Thermal Spray 2000: Proceedings from the International Thermal Spray Conference, 9-14, May 8–11, 2000,
... bubble using interaction with the plasma can have a large effect on the resulting a separate, closely oriented gas jet. The effect of the "twin" co- particle temperature. The postulated interaction is through flowing jet was evaluated by measuring its effect on the mean and deflection of the main plasma...
Proceedings Papers

ITSC2000, Thermal Spray 2000: Proceedings from the International Thermal Spray Conference, 71-77, May 8–11, 2000,
... drastically enhanced by the arc rootfluctuationsespecially for and resulting in a piston flow. The entrained cold air bubbles A1/H2 plasma forming gases. Such fluctuations result in are progressively heated with first oxygen dissociation at plasma jets which are in fact made of flying and 3500 K followed...
Proceedings Papers

ITSC1996, Thermal Spray 1996: Proceedings from the National Thermal Spray Conference, 471-476, October 7–11, 1996,
... of the oxygen content. The measuring method is based on electrochemical determination of the oxygen potential using a solid electrolyte cell. The partial pressure of oxygen along the centreline of the plasma jet was measured with the hydrogen/argon and helium/argon ratio, the gas flow rate and the stand-off...
Proceedings Papers

ITSC2000, Thermal Spray 2000: Proceedings from the International Thermal Spray Conference, 99-104, May 8–11, 2000,
... was promoted with increasing hydrogen flow rate and thermal damages of the samples due to heat transfer from plasma jets weren't observed. Besides, according to the results of wear testing, wear mass loss of nitrided samples were much lower than that of non-nitrided samples. From these results, this process...
Proceedings Papers

ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 803-808, May 25–29, 1998,
... Abstract In dc plasma spray guns, the properties of the plasma forming gas largely control the characteristics of the plasma jet and the momentum and heat of the particles injected into the flow. This paper examines the effect of Ar-He-H2 mixtures on the dynamic and static behavior of plasma...
Proceedings Papers

ITSC1997, Thermal Spray 1997: Proceedings from the United Thermal Spray Conference, 535-542, September 15–18, 1997,
... but depended plasma jet. Therefore, a simple and easy-to-use system was no more on the particle temperature. However, the developed to control in real time the spray jet. In this paper, distribution of light intensity was not uniform within the laser the effect of carrier gas flow rate, arc current and powder...
Proceedings Papers

ITSC2000, Thermal Spray 2000: Proceedings from the International Thermal Spray Conference, 1-7, May 8–11, 2000,
... Abstract The control over coating quality in plasma spraying is partly dependent on the arc and jet instabilities of the plasma torch. Different forms of instabilities have been observed with different effects on the coating quality. We report on an investigation of these instabilities based...
Proceedings Papers

ITSC2000, Thermal Spray 2000: Proceedings from the International Thermal Spray Conference, 1265-1271, May 8–11, 2000,
... and the carrier gas flow for the type of burner used. The change of the grain fraction in the plasma jet was examined for two different powders. Finally, thermal cycling tests were carried out and evaluated for pre-optimized thermal barrier coating samples. plasma spraying porosity reproducibility spray...
Proceedings Papers

ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 461-465, May 25–29, 1998,
... Abstract Production of ceramic coatings by plasma spraying on thermally sensitive substrates requires a hard cooling onto the substrate immediately after the plasma and particles jet getting-through. That implies a cryogenic cooling spray. In order to have a better understanding of thermal...
Proceedings Papers

ITSC2000, Thermal Spray 2000: Proceedings from the International Thermal Spray Conference, 37-43, May 8–11, 2000,
... lengthening occurs first by the gliding of the Power spectra anodic arc root in the direction of the gas flow and then by the bending of the arc termination close to the anode surface [10]. Figure 4 shows power spectra of the voltage, jet light emission and current for the same plasma conditions as in Type 2...
Proceedings Papers

ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 439-444, May 25–29, 1998,
... fields was found to be important only in the near substrate region, indicating that the flow fields calculated from free jet modeling are accurate over the major part of the domain. mathematical modeling plasma jet Thermal Spray: Meeting the Challenges of the 21st Century: Copyright © 1998 ASM...
Proceedings Papers

ITSC1996, Thermal Spray 1996: Proceedings from the National Thermal Spray Conference, 595-602, October 7–11, 1996,
... in the jet above the substrate surface. LTE implies that the species have had Maximizing dissociated species transport in plasma sufficient time to equilibrate amongst themselves. In assisted chemical vapor deposition (CVD), is important actuality, as the plasma flow is expanded into a low in many low...
Proceedings Papers

ITSC1998, Thermal Spray 1998: Proceedings from the International Thermal Spray Conference, 1469-1473, May 25–29, 1998,
... Abstract Polymeric substrates must be effectively cooled during plasma spraying to limit detrimental effects due to heat flow from the plasma jet. Even with the use of auxiliary cooling systems, however, some polymer substrates can undergo superficial modifications caused by particle heating...
Proceedings Papers

ITSC1997, Thermal Spray 1997: Proceedings from the United Thermal Spray Conference, 671-680, September 15–18, 1997,
... Abstract The temperature within plasma-sprayed oxide coatings depends strongly on the cooling devices used during spraying as well as on coating pass thickness and powder flow rate. Two oxides, alumina and zirconia, were deposited using dc Ar-H 2 plasma jets and the shape, size...