Diagnostics and Applications of an Innovative Plasma Torch Generating a Broad Plasma Jet

2000 ◽  
Author(s):  
R. Hartmann ◽  
K.D. Landes
Keyword(s):  
Plasma Torch ◽  
Large Scale ◽  
Circular Cross Section ◽  
Plasma Jet ◽  
Dc Plasma ◽  
Plastic Materials ◽  
Plasma State ◽  
Enthalpy Probe ◽  
Variable Distance ◽  
Reactive Gas

Abstract Conventional DC plasma torch designs lead to a circular cross-section of the emanating plasma jet. Consequently in surface treatment applications the plasma jet hits the substrate within a limited circular working area. Large scale workpieces therefore have to be scanned resulting in a time-consuming procedure. The innovative DC plasma torch system LARGE is characterized by the arrangement of the anode and the cathode opposite to each other on a common axis with a variable distance. The central body of the torch between the electrodes is divided into electrically insulated cascade plates. The plasma gas is injected perpendicular to the torch axis. Passing through the arc, the gas is transferred to the plasma state and leaves the torch laterally through a slit as a plasma jet with extended stripe width. The plasma torch LARGE is investigated by electrical, optical and enthalpy probe diagnostics. Shrouding the electrodes with an inert gas and feeding reactive gas mixtures as main plasma gas allow the torch to be used for plasma chemical reactions, too. Preliminary applications focus on preheating, surface modification of paper and plastic materials as well as on sterilization of nutrition packaging. The capability of plasma enhanced CVD is examined experimentally.

scholarly journals FORMATION OF NANO STRUCTURES IN RESULT OF HOMOGENOUS NUCLEATION OF CARBON OBTAINED IN THERMAL PLASMA UNDER ATMOSPHERIC PRESSURE

2018 ◽  
Vol 59 (8) ◽  
pp. 27
Author(s):  
Marina B. Shavelkina ◽  
Ravil Kh. Amirov ◽  
Tatyana I. Borodina ◽  
Viktor I. Kiselev ◽  
Tatiana B. Shatalova ◽  
...  
Keyword(s):  
Phase Composition ◽  
Thermal Plasma ◽  
Plasma Torch ◽  
Carbon Nanomaterials ◽  
Carbon Sources ◽  
Plasma Jet ◽  
Film Deposition ◽  
Metal Species ◽  
Synthesis Product ◽  
Dc Plasma

Thermal plasma processing of carbon sources using a plasma jet with high heat capacity is one of the most promising methods for the synthesis of new materials. This paper describes the low-temperature deposition of carbon nanomaterials by remote plasma-enhanced chemical vapor deposition (PECVD) in the absence of catalysts. The remote PECVD process differs from conventional and direct PECVD process in two ways: (a) only a subset of the process reactants and/or diluents are directly plasma excited; and (b) thin film deposition takes place on a substrate that is outside of the plasma glow region. In conventional CVD methods, carbon is produced from the decomposition of carbon sources such as hydrocarbons, carbon monoxide, alcohols, and so on, over a metal catalyst. The unavoidable metal species remaining in carbon nanomaterials would lead to obvious disadvantages for property characterization and application exploration. Despite sustained efforts, it is still an intractable problem to remove metal catalysts completely from carbon nanomaterials samples without introducing defects and contaminations. Good reactor design allowed to overcome problems of chemical and structural purity, and poor process robustness in terms of phase composition of product from run to run. For the synthesis of graphene materials, carbon black, carbon nanotubes, nanowires we used the thermal plasma generator which is a high current divergent anode-channel DC plasma torch. The experiment involved a simultaneous input of hydrocarbons (methane, propane, butane, acetylene) with the plasma forming gas (helium, argon, nitrogen) into the plasma torch, wherein heating and decompositions occurred in the plasma jet and in the region of the arc discharge, followed by condensation of the synthesis product on metallic surfaces. The deposition rate was varied with distance from the plasma. Consumption of carbon source, plasma forming gas and plasma torch power were changed independently from each other. For the experimental conditions the electric power of plasma torch was set up to 40 kW. Regularities of formation of carbon thread-like nanostructures and graphene in the course of hydrocarbons pyrolysis in thermal plasma without participation of catalytic particles were studied by means of electron microscopy, X-ray diffraction, IR-spectrometry and thermogravimetry. Depending on the pyrolytic synthesis parameters, different proportions of crystal carbon and soot may be obtained. It has been demonstrated that the phase composition is varied by hydrocarbons flow rate, plasma forming gas pressure and dc plasma torch power. It has been established through the experiments that carbon nucleation is volumetric and proceeds according to the model of explosive soot formation.

scholarly journals Diagnostics of Hybrid Water/Argon Thermal Plasma Jet with Water, Ethanol and Their Mixture Injection to Plasma

2016 ◽  
Vol 3 (2) ◽  
pp. 62-65 ◽  
Author(s):  
M. Hlina ◽  
A. Maslani ◽  
J. Medricky ◽  
J. Kotlan ◽  
R. Musalek ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flow Rate ◽  
Emission Spectroscopy ◽  
Plasma Torch ◽  
Plasma Jet ◽  
Low Flow ◽  
Suspension Spraying ◽  
Arc Power ◽  
Enthalpy Probe ◽  
Temperature Heat

A plasma torch with the water/argon stabilization of an arc is characterized by extremely hot and high velocity plasma together with the relatively low flow rate of plasma, therefore, the torch might be properly used for plasma suspension spraying. Enthalpy probe and emission spectroscopy measurements were carried out at constant arc power with the combination of the injection of water, ethanol or their mixture to the plasma jet to diagnose the changes in temperature, heat flux and other characteristics.

Plasma Jet-Assisted Synthesis of Graphene Using a DC Plasma Torch

2019 ◽  
Vol 45 (11) ◽  
pp. 1080-1086
Author(s):  
M. B. Shavelkina ◽  
R. Kh. Amirov ◽  
D. I. Kavyrshin ◽  
D. I. Yusupov
Keyword(s):  
Plasma Torch ◽  
Plasma Jet ◽  
Dc Plasma

MOTION OF ANODE ATTACHMENT AND FLUCTUATIONS OF PLASMA JET IN DC ARC PLASMA TORCH

1997 ◽  
Vol 1 (2) ◽  
pp. 167-178 ◽  
Author(s):  
Milan Hrabovsky ◽  
M. Konrad ◽  
Vladimir Kopecky ◽  
J. Hlina ◽  
J. Benes ◽  
...  
Keyword(s):  
Plasma Torch ◽  
Plasma Jet ◽  
Arc Plasma ◽  
Arc Plasma Torch ◽  
Dc Arc ◽  
Dc Arc Plasma Torch

The Production Efficiency of Reactive Oxygen and Nitrogen Species (RONS) of AC and Pulse-DC Plasma Jet

2020 ◽  
Vol 48 (12) ◽  
pp. 4204-4214
Author(s):  
Jiayin Li ◽  
Fan Wu ◽  
Lanlan Nie ◽  
Xinpei Lu ◽  
Kostya Ostrikov
Keyword(s):  
Production Efficiency ◽  
Reactive Oxygen ◽  
Plasma Jet ◽  
Nitrogen Species ◽  
Dc Plasma

Energy balance for a DC plasma torch

1980 ◽  
Vol 58 (2) ◽  
pp. 171-176 ◽  
Author(s):  
Azhar Bokari ◽  
Maher Boulos
Keyword(s):  
Energy Balance ◽  
Plasma Torch ◽  
Dc Plasma

scholarly journals Optical and structural study for DLC thin films prepared by plasma jet

2019 ◽  
Vol 17 (40) ◽  
pp. 50-58
Author(s):  
S. J. Kadhem
Keyword(s):  
Thin Films ◽  
High Voltage ◽  
Plasma Torch ◽  
Energy Gap ◽  
Plasma Jet ◽  
Optical Energy Gap ◽  
X Ray ◽  
Xrd Diffraction ◽  
Fourier Transformation Infrared Spectroscopy ◽  
Uv Visible

Diamond-like carbon (DLC) homogeneous thin films were deposited from cyclohexane (Ccyclohexane (Ccyclohexane (Ccyclohexane (C cyclohexane (Ccyclohexane (Ccyclohexane (C cyclohexane (Ccyclohexane (C 6H12 ) liquid by using a plasma jet system which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5 which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5which operates with alternating high voltage 7.5 kv and kv and kv and kv and frequency 28 frequency 28frequency 28 frequency 28frequency 28frequency 28frequency 28frequency 28 kHz. kHz. The optical and structural properties and chemical bonding of these films were investigated. In this work, the effect of changing the distance between the substrate and the plasma torch (2, 2.5 and 3 cm) was studied. The flow rate of argon gas which used to generate the plasma was fixed (0.5 L/min). These films were characterized by UV–Visible spectrophotometer, X-ray diffractometer (XRD) and scanning electron microscopy (SEM) and Fourier transformation infrared spectroscopy (FTIR). The maximum absorption (λmax) appears around 312, 298.3 and 293.2 nm at the three distance between plasma torch and the substrate 2.5, 2 and 3 cm, respectively. The values of the optical energy gap are 3.47, 3.65 and 3.76 eV at a different distance (2, 2.5 and 3cm), respectively. In XRD diffraction pattern, The occurrence of diamond peaks and graphite peaks in the x-ray spectrum for these films Indicates that there is an occurrence of local ordered sp3 and sp2 for carbon domains and graphite respectively.

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