Diagnostics of hydrogen-oxygen plasma jet for application in gas thermal spraying

2020 ◽  
Vol 2020 (11) ◽  
pp. 41-45
Author(s):  
Yu.S. Popil ◽  
◽  
V.M. Korzh ◽  
V.Ya. Chernyak ◽  
Ye.A. Zakharov ◽  
...  
Keyword(s):  
Oxygen Plasma ◽  
Thermal Spraying ◽  
Plasma Jet

Diagnostics of hydrogen-oxygen plasma jet for application in thermal spraying

2020 ◽  
Vol 2020 (11) ◽  
pp. 36-40
Author(s):  
Yu.S. Popil ◽  
◽  
V.M. Korzh ◽  
V.Ya. Chernyak ◽  
Ye.A. Zakharov ◽  
...  
Keyword(s):  
Oxygen Plasma ◽  
Thermal Spraying ◽  
Plasma Jet

Atmospheric Pressure Cold Argon/Oxygen Plasma Jet Assisted by Preionization of Syringe Needle Electrode

2010 ◽  
Vol 12 (5) ◽  
pp. 561-565 ◽  
Author(s):  
Qian Muyang ◽  
Ren Chunsheng ◽  
Wang Dezhen ◽  
Feng Yan ◽  
Zhang Jialiang
Keyword(s):  
Atmospheric Pressure ◽  
Oxygen Plasma ◽  
Plasma Jet ◽  
Needle Electrode ◽  
Syringe Needle

Structural and Mechanical Characterization of Hard Layers Obtained by Plasma Jet Thermal Spraying

2013 ◽  
Vol 814 ◽  
pp. 41-48
Author(s):  
Doru Romulus Pascu ◽  
Dragos Buzdugan ◽  
Sorin Dragoi
Keyword(s):  
Solid Solutions ◽  
Fine Particles ◽  
Mechanical Characterization ◽  
Thermal Spraying ◽  
Plasma Jet ◽  
Industrial Practice ◽  
Viable Solution ◽  
Active Zones ◽  
Measured Hardness

In many countries, in the industrial practice, the hard layers deposition is used to increase the hardness of the components active zones. A viable solution to increase the imposed properties consists in the deposition of amorphous layers by thermal spraying. Ferroalloy powders were deposited by plasma jet thermal spraying on aluminium substrates in order to increase the hardness. By plasma jet thermal spraying of Fe-B, Fe-Ni-B and Fe-Cr-Mn-Mo-W-B-P-Si powders on aluminum supports, have been obtained hard layers having the thickness between 72 μm and 86 μm, and granular structures made from α solid solutions, fine particles of specific oxides and complex particles of Fe-B, Fe-B-Si, Fe-Cr, Fe-W-Mo and Fe-P. The measured hardness had the values between 383 and 391 HV1 for the deposited layers made from powders type Fe-B, the values between 410 and 420 HV1 for the deposited layers made from powders type Fe-Ni-B, and the values between 448 and 475 HV1 for the deposited layers made from powders type Fe-Cr-Mn-Mo-W-B-P-Si. No defects, such as cracks or microcracks, have been observed on the hard layers surfaces deposited by plasma jet thermal spraying.

Etching of DLC films using a low intensity oxygen plasma jet

2000 ◽  
Vol 9 (3-6) ◽  
pp. 685-688 ◽  
Author(s):  
W.I. Urruchi ◽  
M. Massi ◽  
H.S. Maciel ◽  
C. Otani ◽  
L.N. Nishioka
Keyword(s):  
Oxygen Plasma ◽  
Plasma Jet ◽  
Low Intensity

scholarly journals A Unified Numerical Model of Oxygen Plasma Jet at Atmospheric Pressure

2007 ◽  
Vol 32 (2) ◽  
pp. 535-538
Author(s):  
Manabu Tanaka ◽  
Shinichi Tashiro ◽  
Masakazu Shibahara ◽  
Kazushi Tanaka
Keyword(s):  
Numerical Model ◽  
Atmospheric Pressure ◽  
Oxygen Plasma ◽  
Plasma Jet

Effects of Pressure Deposition on Plasma Jet and Coatings Microstructure

1996 ◽  
Author(s):  
T. Valente ◽  
L. Bertamini ◽  
M. Tului
Keyword(s):  
Particle Velocity ◽  
Thermal Spraying ◽  
Plasma Jet ◽  
Low Pressure ◽  
Pressure Effects ◽  
Average Particle ◽  
Preliminary Evaluation ◽  
Jet Length ◽  
Visible Part ◽  
Steel Substrates

Abstract Pressure inside the spray chamber plays a key role during coatings manufacturing by thermal spraying and coating properties can be strongly affected by the selected pressure value. Spraying at low pressure results in a longer plasma jet length, higher particle velocity, lower coating porosity and higher purity and phase stability. For what concerns plasma-particle interactions, a reduction of pressure value drastically decreases heat transfer towards particles, therefore high power plasma equipment must be used to achieve a suitable melting degree of sprayed powders. Effects of low pressure values are well known, but few investigation have been carried out on effects of pressure for values higher than 1,000 mbar. In this paper a preliminary evaluation of pressure effects on plasma jet modifications, particle velocity and coatings microstructure is presented. By using the very innovative CAPS (Controlled Atmosphere Plasma Spraying) system, Ni-20%Al powders were sprayed at different pressure values, up to 3,600 mbar. The length and width of the visible part of the plasma jet was measured and controlled. Average particle velocity was also evaluated as a function of pressure. Coatings, manufactured on stainless steel substrates, were characterized by means of scanning electron microscopy and energy dispersive spectroscopy, x-ray diffraction and Vickers microhardness measurements. Results indicate that the higher the spraying pressure the lower the plasma jet length and particle velocity; but also a lower selective evaporation of aluminum and higher microhardness values were observed.

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