Characteristics of Plasma Flame in Metal-Cutting Apparatus of the Transferred-Type Plasma-Jet System

ABSTRACTA unique and efficient plasma jet reactor has been developed and used to study the high temperature production of carbon monoxide from a reaction between powdered carbon and a pure carbon dioxide plasma. The plasma jet reactor was designed to allow the injection of powdered carbon above the arc discharge region rather than into the plasma flame below the arc discharge region. High yields of carbon monoxide, produced at relatively high efficiencies, were a direct result of this technique. The plasma jet was also designed to enable rapid changing and testing of various anode insertsAverage yields of carbon monoxide in the product gases were as high as 80–87% in selected experimental trials. Carbon monoxide was produced at rates exceeding 15,000 1/hr (at STP) with a power expenditure of 52 Kw.

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Emission Spectrographic Analysis of Metal Solid Samples with Plasma Jet Flame. I. Application of Nitrogen Plasma Flame

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.42.693 ◽

1969 ◽

Vol 42 (3) ◽

pp. 693-695 ◽

Cited By ~ 7

Author(s):

Kichinosuke Hirokawa ◽

Hidehiro Gotô

Keyword(s):

Plasma Jet ◽

Nitrogen Plasma ◽

Spectrographic Analysis ◽

Solid Samples ◽

Plasma Flame ◽

Jet Flame

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Novel Zro2-Mullite Composites Produced by Plasma Spraying

Thermal Spray 1998: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc1998p1233 ◽

1998 ◽

Author(s):

K.A. Khor ◽

Y. Li

Keyword(s):

Plasma Spraying ◽

Structural Integrity ◽

Plasma Jet ◽

Distilled Water ◽

Composite Powders ◽

Plasma Flame ◽

Amorphous Phases ◽

Plasma Sprayed Coatings ◽

Plasma Sprayed ◽

Sprayed Coatings

Abstract Zirconia can induce enhanced fracture toughness to a number of ceramics when introduced as a reinforcement either in the form of particulates, dispersed phase or whiskers because of its unique tetragonal-monoclinic (t-*m) transformation. This paper presents the preparation of Zr0 2 reinforced mullite by plasma spraying a mixtures of zircon and alumina. The dissociation of zircon into zirconia and silica in a plasma flame is well-known. Pre-mixed powders of zircon and alumina are injected into a dc plasma jet. The plasma sprayed particles are collected in distilled water and analyzed. The results indicate that the plasma sprayed powders consist of zirconia, zircon and alumina. It was found that fine, mostly amorphous and chemically homogeneous composite powders can be obtained by ball milling and plasma spraying. Recrystallization of amorphous phases and formation of mullite occurred at about 1000 °C in plasma sprayed powders. This value is more than 500 °C lower than the formation of mullite in as-milled powders. Uniform coatings with good structural integrity were obtained by plasma spraying. The amount of amorphous phases was much higher in plasma sprayed coatings than in spheroidized powders, and the relative quantity of mullite in coatings after heat treatment is about 4 times as much as that obtained in the spheroidized powders.

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Effect of the Gas-Vortex Stabilization Method on the Plasma Cutting Quality

Materials Science Forum ◽

10.4028/www.scientific.net/msf.989.781 ◽

2020 ◽

Vol 989 ◽

pp. 781-786

Author(s):

I.Y. Matushkina ◽

S.V. Anakhov ◽

Yu.A. Pyckin

Keyword(s):

Metal Cutting ◽

Thin Sheet ◽

Gas Injection ◽

Plasma Jet ◽

Radial Component ◽

Kinetic Properties ◽

Stabilization Method ◽

Plasma Torches ◽

Zone Of Influence ◽

Jet Plasma

Various methods of gas-vortex stabilization in plasma torches for metal cutting are investigated. The influence of an angle of plasma-forming gas injection into the nozzle on kinematic characteristics of the plasma jet is shown. The increase in the radial component of the velocity at the output from the swirler makes it possible to increase the uniformity of velocity distribution and the kinetic properties of jet in the zone of influence on the cut metal. For the cutting of the thin sheet metals, it is advisable to use the technology of "narrow-jet plasma".

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Production, Characterization, and Wear Behaviour of Plasma Jet CVD Diamond Films on Hard Metal Cutting Tools

phys stat sol (a) ◽

10.1002/pssa.2211540129 ◽

1996 ◽

Vol 154 (1) ◽

pp. 403-422 ◽

Cited By ~ 12

Author(s):

F. Deuerler ◽

M. Pies ◽

H. van den Berg ◽

R. Tabersky ◽

V. Buck

Keyword(s):

Metal Cutting ◽

Cutting Tools ◽

Diamond Films ◽

Plasma Jet ◽

Cvd Diamond ◽

Hard Metal ◽

Wear Behaviour

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Modelling of Kerf Width in Plasma Jet Metal Cutting Process using ANN Approach

Tehnicki vjesnik - Technical Gazette ◽

10.17559/tv-20161024093323 ◽

2018 ◽

Vol 25 (2) ◽

Cited By ~ 3

Keyword(s):

Metal Cutting ◽

Plasma Jet ◽

Kerf Width ◽

Cutting Process

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Model and Powder Particle Heating, Melting, Resolidification, and Evaporation in Plasma Spraying Processes

Journal of Heat Transfer ◽

10.1115/1.2826034 ◽

1999 ◽

Vol 121 (3) ◽

pp. 691-699 ◽

Cited By ~ 89

Author(s):

Y. P. Wan ◽

V. Prasad ◽

G.-X. Wang ◽

S. Sampath ◽

J. R. Fincke

Keyword(s):

Plasma Jet ◽

Industrial Applications ◽

Solid Particles ◽

Particle Model ◽

Comprehensive Model ◽

Gas Field ◽

Plasma Flame ◽

One Dimensional ◽

Powder Particles ◽

Strong Evaporation

A comprehensive model is developed to study the heating, melting, evaporation, and resolidification of powder particles in plasma flames. The well-established LAVA code for plasma flame simulation is used to predict the plasma gas field under given power conditions, and provide inputs to the particle model. The particle is assumed to be a spherical and one-dimensional heat conduction equation with phase change within the particle is solved numerically using an appropriate coordinate transformation and finite difference method. Melting, vaporization, and resolidification interfaces are tracked and the particle vaporization is accounted for by the mass diffusion of vapor through the boundary layer around the particle. The effect of mass transfer on convective heat transfer is also included. Calculations have been carried out for a single particle injected into an Ar–H2 plasma jet. Zirconia and nickel are selected as solid particles because of their widespread industrial applications as well as significant differences in their thermal properties. Numerical results show strong nonisothermal effect of heating, especially for materials with low thermal conductivity, such as zirconia. The model also predicts strong evaporation of the material at high temperatures.

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