Modeling of non-Newtonian suspension plasma spraying in an inductively coupled plasma torch

2011 ◽  
Vol 50 (8) ◽  
pp. 1417-1427 ◽  
Author(s):  
Lijuan Qian ◽  
Jianzhong Lin ◽  
Hongbing Xiong
Keyword(s):  
Plasma Spraying ◽  
Inductively Coupled Plasma ◽  
Plasma Torch ◽  
Suspension Plasma Spraying ◽  
Inductively Coupled

Suspension Plasma Spraying for the Preparation of Perovskite Powders and Coatings

1997 ◽  
Author(s):  
G. Schiller ◽  
M. Müller ◽  
F. Gitzhofer
Keyword(s):  
Liquid Phase ◽  
Plasma Spraying ◽  
Inductively Coupled Plasma ◽  
Oxygen Plasma ◽  
Ethanol Solution ◽  
Suspension Plasma Spraying ◽  
Plasma Sheath ◽  
Molar Ratio ◽  
Inductively Coupled ◽  
Reactor Pressure

Abstract LaMnO3 powders and coatings have been prepared by reactive suspension plasma spraying (SPS) of MnO2 powders and LaCl3 solutions. A 40 kW inductively coupled plasma with an oxygen plasma sheath gas has been used. Water and ethanol have been tested as the liquid phase in the SPS process. High perovskite content (70-90%) has been achieved for both powders and coatings when spraying a suspension of fine MnO2 powder in a saturated ethanol solution of LaCl3 with a 1:1 molar ratio of La and Mn. Materials obtained by a 1100 °C oven treatment have been used as reference during the study. The reactor pressure was varied from 30 to 80 kPa. Low pressure was found to be necessary to suppress the formation of undesired phases in the powders and coatings obtained. A plasma post treatment of the coatings results in an increase of the perovskite content.

Preparation of Perovskite Powders and Coatings by RF-Suspension Plasma Spraying

1998 ◽  
Author(s):  
G. Schiller ◽  
M. Muller ◽  
F. Gitzhofer
Keyword(s):  
Plasma Spraying ◽  
Inductively Coupled Plasma ◽  
Oxygen Plasma ◽  
Ethanol Solution ◽  
Suspension Plasma Spraying ◽  
Plasma Sheath ◽  
Solid State Reactions ◽  
Molar Ratio ◽  
Inductively Coupled ◽  
Spray Process

Abstract Perovskite-type LaMnO3 powders and coatings have been prepared by a novel technique, the reactive suspension plasma spraying (SPS) using an inductively coupled plasma of about 40 kW plate power and an oxygen plasma sheath gas. Suitable precursor mixtures were found on the basis of solid state reactions, solubility and the phases obtained during the spray process. Best results were achieved by spraying a suspension of fine MnO2 powder in a saturated ethanol solution of LaCl3 with a 1:1 molar ratio of La and Mn. Low reactor pressure was helpful in order to diminish the amount of corrosive chlorine compounds in the reactor. As-sprayed coatings and collected powders showed perovskite contents of 70-90%. After a post-treatment with an 80% oxygen plasma an almost pure LaMnO3 deposit was achieved in the center of the incident plasma jet.

scholarly journals Power Dissipation of an Inductively Coupled Plasma Torch under E Mode Dominated Regime

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 834
Author(s):  
Nan Yu ◽  
Renaud Jourdain ◽  
Mustapha Gourma ◽  
Fangda Xu ◽  
Adam Bennett ◽  
...  
Keyword(s):  
Power Dissipation ◽  
Inductively Coupled Plasma ◽  
Plasma Torch ◽  
Electrical Response ◽  
Inductively Coupled ◽  
De Laval Nozzle ◽  
Surface Fabrication ◽  
Icp Torch ◽  
Frequency Power

This paper focuses on the power dissipation of a plasma torch used for an optical surface fabrication process. The process utilizes an inductively coupled plasma (ICP) torch that is equipped with a De-Laval nozzle for the delivery of a highly collimated plasma jet. The plasma torch makes use of a self-igniting coil and an intermediate co-axial tube made of alumina. The torch has a distinctive thermal and electrical response compared to regular ICP torches. In this study, the results of the power dissipation investigation reveal the true efficiency of the torch and discern its electrical response. By systematically measuring the coolant parameters (temperature change and flow rate), the power dissipation is extrapolated. The radio frequency power supply is set to 800 W, E mode, throughout the research presented in this study. The analytical results of power dissipation, derived from the experiments, show that 15.4% and 33.3% are dissipated by the nozzle and coil coolant channels, respectively. The experiments also enable the determination of the thermal time constant of the plasma torch for the entire range of RF power.

Suspension Plasma Spraying (SPS) of Cobalt Spinel

1997 ◽  
Author(s):  
G. Schiller ◽  
M. Müller ◽  
F. Gitzhofer ◽  
M.I. Boulos ◽  
R.B. Heimann
Keyword(s):  
Plasma Spraying ◽  
Inductively Coupled Plasma ◽  
Solid Phase ◽  
Spinel Phase ◽  
Rf Plasma ◽  
Dry Powders ◽  
Inductively Coupled ◽  
Cobalt Spinel ◽  
Chemical Conditions ◽  
Physical And Chemical

Abstract Fine (median size 6 μm and 0.3 μm) cobalt spinel (Co3O4) powders were processed suspended in a suitable liquid phase. Suspensions exceeding 50 wt.% solid phase content were successfully injected into an inductively coupled plasma. Spheroidized powders with large particle size (up to 80 μm) were prepared, and cobalt oxide coatings were produced by this novel RF-SPS method. The microstructural features of the coatings can be controlled by parameter optimization similarly to plasma spraying of dry powders. Numerous variations of the physical and chemical conditions of the process were performed in an attempt to overcome the main disadvantage of the process, i.e. the decomposition of the spinel phase to CoO. So far, the spinel phase could be reestablished only by a post-treatment of the deposited coatings with atomic oxygen in the RF plasma.

scholarly journals Solid Carbon Produced in an Inductively Coupled Plasma Torch with a Titan Like Atmosphere

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
D. Vacher ◽  
S. Menecier ◽  
M. Dudeck ◽  
M. Dubois ◽  
B. Devouard ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Plasma Torch ◽  
Planetary Atmosphere ◽  
Radiative Properties ◽  
Carbon Powder ◽  
Solid Carbon ◽  
Inductively Coupled ◽  
Nanostructured Particles ◽  
Initial Research

Solid carbon is deposited on the surfaces of an inductively coupled plasma torch operating with a Titan like atmosphere plasma gas. The frame of the initial research is the study of the radiative properties of plasma encountered around a spacecraft during its hypersonic entry in upper layers of planetary atmosphere. Deposition of carbon is observed not only on the quartz tube outside the inductor but also on the ceramic protection of the torch injector. Carbon exhibits two types of morphology more or less dense and it is analyzed by various analytic devices as MEB, SEM, TEM, EDS and Raman spectroscopy. The gathered carbon powder shows the presence of nanostructured particles.

Sign in / Sign up

Export Citation Format

Share Document