Radiographic research of the metal-puff plasma jets formed by the vacuum arc discharge

2017 ◽  
Author(s):  
A. G. Rousskikh ◽  
A. P. Artyomov ◽  
A. S. Zhigalin ◽  
A. V. Fedunin ◽  
V. I. Oreshkin ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Plasma Jets ◽  
Vacuum Arc

Study of formation mechanism of double metal plasma jets in a low-current pulsed vacuum arc discharge

2021 ◽  
Vol 33 (3) ◽  
pp. 037103
Author(s):  
Jia Tian ◽  
Wenzheng Liu ◽  
Wenjun Zhang ◽  
Xitao Jiang
Keyword(s):  
Formation Mechanism ◽  
Arc Discharge ◽  
Plasma Jets ◽  
Vacuum Arc ◽  
Metal Plasma

Study of ion separation mechanism in the multi-component vacuum arc discharge

2021 ◽  
Author(s):  
Qiang Sun ◽  
Qianhong Zhou ◽  
Hantian Zhang ◽  
Wei Yang ◽  
Ye Dong ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Cathode Spot ◽  
Arc Discharge ◽  
Fluid Model ◽  
Composite Cathode ◽  
Plasma Jets ◽  
Vacuum Arc ◽  
Separation Mechanism ◽  
Ion Separation ◽  
Light Ions

Abstract The separation phenomenon of light and heavy ions was widely observed experimentally in the vacuum arc discharge with multi-component composite cathode. In this work, a two-dimensional axisymmetric multi-fluid model is used to study the separation mechanism in the multi-component composite cathode vacuum arc. The multi-component vacuum arcs are simulated as a whole which includes separate cathode spot jets, the mixing region, and common arc column. The results show that the plasma jets originated from the separate cathode spot mix together to form a common arc column after a certain distance from the cathode. Due to the rapid increase of ion temperature dozens of times in mixing region of cathode spot jet, the effect of pressure gradient becomes far greater than that of the collisions between light and heavy ions. This leads to a shift in the predominant ion motion mechanism from ion-ion collision (single cathode spot jet region) to pressure expansion (the mixing region). Finally, the light ions gain higher velocities under pressure expansion. In addition, the effect of thermal conductivity and viscosity leads to the wider high temperature regions for light ions, thus making a wider distribution of corresponding ion flux. The numerical results are qualitatively consistent with the experimental results. This paper provides an insight into ion separation mechanism in the multi-component vacuum arc.

Preparation and characterization of thin films of carbon nitride

1995 ◽  
Vol 53 ◽  
pp. 104-105
Author(s):  
L. Wan ◽  
R. F. Egerton
Keyword(s):  
Carbon Nitride ◽  
Arc Discharge ◽  
Ion Beam ◽  
Chemical Vapor ◽  
Reactive Sputtering ◽  
Vacuum Arc ◽  
Specimen Preparation ◽  
Bonding Structure ◽  
Electron Energy Loss

INTRODUCTION Recently, a new compound carbon nitride (CNx) has captured the attention of materials scientists, resulting from the prediction of a metastable crystal structure β-C3N4. Calculations showed that the mechanical properties of β-C3N4 are close to those of diamond. Various methods, including high pressure synthesis, ion beam deposition, chemical vapor deposition, plasma enhanced evaporation, and reactive sputtering, have been used in an attempt to make this compound. In this paper, we present the results of electron energy loss spectroscopy (EELS) analysis of composition and bonding structure of CNX films deposited by two different methods.SPECIMEN PREPARATION Specimens were prepared by arc-discharge evaporation and reactive sputtering. The apparatus for evaporation is similar to the traditional setup of vacuum arc-discharge evaporation, but working in a 0.05 torr ambient of nitrogen or ammonia. A bias was applied between the carbon source and the substrate in order to generate more ions and electrons and change their energy. During deposition, this bias causes a secondary discharge between the source and the substrate.

Plasma-assisted deposition of indium tin oxide thin films by sublimation using an anodic vacuum arc discharge

2021 ◽  
pp. 138731
Author(s):  
Bert Scheffel ◽  
Olaf Zywitzki ◽  
Thomas Preußner ◽  
Torsten Kopte
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Arc Discharge ◽  
Vacuum Arc ◽  
Oxide Thin Films

Investigation of the possibility of using a duoplasmatron with a vacuum arc discharge to produce films of powder materials with low conductivity

1994 ◽  
Vol 37 (3) ◽  
pp. 300-308
Author(s):  
I. S. Abramov ◽  
V. A. Andreev ◽  
V. T. Barchenko ◽  
A. V. Gusev ◽  
A. A. Lisenkov
Keyword(s):  
Arc Discharge ◽  
Vacuum Arc ◽  
Powder Materials

Physical investigations of a high-current vacuum arc discharge

1992 ◽  
Vol 62 (5) ◽  
pp. 525-530
Author(s):  
G. A. Dyuzhev ◽  
S. M. Shkol'nik
Keyword(s):  
Arc Discharge ◽  
Vacuum Arc ◽  
High Current

Fabrication of graphene from graphite by a thermal assisted vacuum arc discharge system

2017 ◽  
Vol 104 ◽  
pp. 258-265 ◽  
Author(s):  
Guo-Wei Cheng ◽  
Kevin Chu ◽  
Jeng Shiung Chen ◽  
Jeff T.H. Tsai
Keyword(s):  
Arc Discharge ◽  
Vacuum Arc ◽  
Discharge System

Instability phenomenon of high-frequency vacuum arc discharge associated with anode activity

2017 ◽  
Vol 121 (14) ◽  
pp. 143302 ◽  
Author(s):  
Y. Inada ◽  
T. Kamiya ◽  
S. Matsuoka ◽  
A. Kumada ◽  
H. Ikeda ◽  
...  
Keyword(s):  
High Frequency ◽  
Arc Discharge ◽  
Vacuum Arc ◽  
Instability Phenomenon

Comparative Studies on the Cutting Performance of CVD Diamond and DLC Coated Inserts in Turning GFRP Composite Materials

2010 ◽  
Vol 431-432 ◽  
pp. 466-469
Author(s):  
Dong Can Zhang ◽  
Bin Shen ◽  
Fang Hong Sun ◽  
Ming Chen ◽  
Zhi Ming Zhang
Keyword(s):  
Composite Materials ◽  
Flank Wear ◽  
Arc Discharge ◽  
Cutting Tools ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Vacuum Arc ◽  
Reinforced Plastics ◽  
Gfrp Composite

The diamond and diamond-like carbon (DLC) films were deposited on the cobalt cemented tungsten carbide (WC-Co) cutting tools respectively adopting the hot filament chemical vapor deposition (HFCVD) technique and the vacuum arc discharge with a graphite cathode. The scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD) and Raman spectroscopy were used to characterize the as-deposited diamond and DLC films. To evaluate their cutting performance, comparative turning tests were conducted using the uncoated WC-Co and as-fabricated CVD diamond and DLC coated inserts, with glass fiber reinforced plastics (GFRP) composite materials as the workpiece. The research results exhibited that diamond and DLC coated inserts had great advantages in cutting tests compared to uncoated insert. The flank wear of the CVD diamond coated insert maintained a very low value about 50μm before the cutting tool failure occurred. For the DLC coated insert, its flank wear always maintained a nearly constant value of 70~200μm during whole 45 minutes turning process. The flank wear of CVD diamond coated insert was lower than that of DLC coated insert before diamond films peeling off.

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