Neck Formation and Growth in High-Voltage Discharge Forming of Metal Powders

The response of metal powders contained in columnar form to high voltage electrical discharge between its ends is described in terms of the electrical, physical, morphological, and compositional characteristics of the powder. The process is viewed as one involving oxide film breakdown, interparticle neck formation, and consolidation. The mechanics, structures, and industrial applications of the process are discussed.

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A note on the formation of fulgurites

Geological Magazine ◽

10.1017/s001675680003051x ◽

1980 ◽

Vol 117 (3) ◽

pp. 293-296 ◽

Cited By ~ 1

Author(s):

D. J. Williams ◽

W. Johnson

Keyword(s):

High Voltage ◽

Experimental Work ◽

Large Volume ◽

Copper Powder ◽

Lightning Discharge ◽

Metal Powders ◽

Fused Quartz ◽

Good Conductor ◽

Sand Particles ◽

High Voltage Discharge

SummaryA phenomenon similar to the sand tube fulgurite has been observed in experimental work carried out to compact and sinter metal powders using high voltage discharges. The sand tube fulgurite is a fused quartz tube formed by the passage of a lightning discharge. Further experiments, in which a high voltage discharge was passed from a pointed electrode held above a large volume of copper powder, through to an earthed plate, give a copper product with the characteristic fulgurite morphology. This result suggests that the quartz sand can behave as a good conductor in the lightning discharge, perhaps due to conducting coatings on the surface of the sand particles.

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Parameters of the Plasma of a Large-Scale High-Voltage Discharge in Air at Reduced Pressures

Plasma Physics Reports ◽

10.1134/s1063780x19060102 ◽

2019 ◽

Vol 45 (6) ◽

pp. 527-536 ◽

Cited By ~ 1

Author(s):

A. V. Strikovskiy ◽

S. V. Korobkov ◽

M. E. Gushchin ◽

A. A. Evtushenko ◽

I. Yu. Zudin

Keyword(s):

High Voltage ◽

Large Scale ◽

High Voltage Discharge ◽

Reduced Pressures

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Experimental Study on Pressure Wave Characteristics of High-Voltage Discharge in Water with Hemispherical Electrodes

IEEE Access ◽

10.1109/access.2021.3075488 ◽

2021 ◽

pp. 1-1

Author(s):

Bin Li ◽

Sheng Xue ◽

Liang Yuan

Keyword(s):

Experimental Study ◽

High Voltage ◽

Pressure Wave ◽

Wave Characteristics ◽

High Voltage Discharge

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Formation of chemical species and their effects on microorganisms using a pulsed high-voltage discharge in water

IEEE Transactions on Industry Applications ◽

10.1109/28.485820 ◽

1996 ◽

Vol 32 (1) ◽

pp. 106-112 ◽

Cited By ~ 277

Author(s):

M. Sato ◽

T. Ohgiyama ◽

J.S. Clements

Keyword(s):

High Voltage ◽

Chemical Species ◽

High Voltage Discharge

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Observation of hard radiations in a laboratory atmospheric high-voltage discharge

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/aa5dba ◽

2017 ◽

Vol 50 (16) ◽

pp. 165202 ◽

Cited By ~ 4

Author(s):

A V Agafonov ◽

V A Bogachenkov ◽

A P Chubenko ◽

A V Oginov ◽

A A Rodionov ◽

...

Keyword(s):

High Voltage ◽

High Voltage Discharge

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Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

Plasma ◽

10.3390/plasma4020021 ◽

2021 ◽

Vol 4 (2) ◽

pp. 309-331

Author(s):

Wahyu Diono ◽

Siti Machmudah ◽

Hideki Kanda ◽

Yaping Zhao ◽

Motonobu Goto

Keyword(s):

High Pressure ◽

High Voltage ◽

Electrode Materials ◽

Discharge Plasma ◽

Type System ◽

Nanoparticle Synthesis ◽

Plasma Source ◽

Synthesis Of Nanoparticles ◽

Water Pollutant ◽

High Voltage Discharge

The application of high-voltage discharge plasma for water pollutant decomposition and the synthesis of nanoparticles under a high-pressure argon gas environment (~4 MPa) was demonstrated. The experiments were carried out in a batch-type system at room temperature with a pulsed DC power supply (15.4 to 18.6 kV) as a discharge plasma source. The results showed that the electrode materials, the pulsed repetition rates, the applied number of pulses, and the applied voltages had a significant effect on the degradation reactions of organic compounds. Furthermore, carbon solid materials from glycine decomposition were generated during the high-voltage discharge plasma treatment under high-pressure conditions, while Raman spectra and the HRTEM images indicated that titanium dioxide with a brookite structure and titanium carbide nanoparticles were also formed under these conditions. It was concluded that this process is applicable in practice and may lead to advanced organic compound decomposition and metal-based nanoparticle synthesis technologies.

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