Determination of the cathode erosion and temperature for the phases of high voltage discharges using FEM simulations

Soldera, F.; Lasagni, Andrés Fabían; Mücklich, Frank; Kaiser, Thomas; Hrastnik, K.

doi:10.1016/j.commatsci.2004.06.004

Cited by 23 publications

(19 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon has been attributed to melting of the electrode material and subsequent bubble formation at the discharge tip. Plasma pressure and shockwaves cause bursting of these bubbles and the release of electrode material into the surrounding media [14,16]. To our knowledge, very few studies on electrode erosion in an aqueous high voltage discharge reactor have been reported in the literature [7][8][9][10].…”

Section: H 2 O 2 Formation Studies With Different Needle Electrode Mamentioning

confidence: 99%

Influence of High Voltage Needle Electrode Material on Hydrogen Peroxide Formation and Electrode Erosion in a Hybrid Gas–Liquid Series Electrical Discharge Reactor

Holzer

Locke

2007

Plasma Chem Plasma Process

View full text Add to dashboard Cite

Formation rates of hydrogen peroxide and electrode erosion rates for a range of different electrode materials were determined in a gas-liquid pulsed electrical discharge reactor with a high voltage electrode needle in the liquid and a ground electrode suspended in the gas over the liquid. It was found that the H 2 O 2 formation rates and efficiencies did not depend on the electrode material. Electrode erosion from lowest to highest followed the series: nickel chromium, thoriated tungsten, diamond-coated tungsten, stainless steel, tungsten carbide and tungsten copper alloy. Smooth crater-like morphology was found for nickel chromium, titanium and tungsten carbide and a much finer surface structure with small protrusions for the tungsten, tungsten copper and the copper. Doubling the electrode diameter lead to an increase in the H 2 O 2 formation per eroded length by a factor of three but it also decreased the energy efficiency yield of H 2 O 2 by more than 20%.

show abstract

Section: H 2 O 2 Formation Studies With Different Needle Electrode Mamentioning

confidence: 99%

Influence of High Voltage Needle Electrode Material on Hydrogen Peroxide Formation and Electrode Erosion in a Hybrid Gas–Liquid Series Electrical Discharge Reactor

Holzer

Locke

2007

Plasma Chem Plasma Process

View full text Add to dashboard Cite

show abstract

“…The temperature distribution is determined according to the model of Soldera et al [33] This model calculates the heat conduction in a material with moving boundaries (interfaces of vapour-liquid and liquid-solid phase transitions). This simulation is based on heat diffusion:…”

mentioning

confidence: 99%

“…The initial diameter (in platinum) is assumed to be 14 lm. [33] The power input was calculated from the current and voltage curves of a spark discharge, registered with the oscilloscope. The radial temperature distribution in the cathode spot at the time of maximum temperature is shown in Figure 6.…”

mentioning

confidence: 99%

Oxidation Damage of Spark Plug Electrodes

et al. 2005

Self Cite

View full text Add to dashboard Cite

Knowledge about the erosion mechanisms of spark plug materials is of fundamental interest for the development of materials with a high resistance against electrode erosion. Endurance tests were performed to study the wear behaviour of platinum, iridium, silver and nickel as electrode materials for spark plugs between 200 and 900 °C. Oxidation must be the dominating mechanism, irrespective of the material. Additional calculations resulted in the suggestion of a plasma‐assisted oxidation process.

show abstract

“…In this case, no arc is formed and the breakdown is immediately followed by a glow discharge. Since the power input density in the cathode of a glow discharge is not sufficient to melt the surface, [7,20] these craters can only be attributed to the initial breakdown phase. At high external pressures, however, both intense heating and high pressure are acting simultaneously on the surface, resulting in turbulent mixing in the molten layers and formation of crater depressions and rims.…”

Section: Influence Of the Pressure On The Crater Formationmentioning

confidence: 99%

Microstructure Characterisation of Electrical Discharge Craters using FIB/SEM Dual Beam Techniques

et al. 2008

Self Cite

View full text Add to dashboard Cite

This paper presents the characterisation of erosion craters caused by high voltage ignition discharges on the surface of electrodes. By means of FIB/SEM dual beam techniques such as FIB‐cross sectioning, FIB‐nanotomography and FIB‐EBSD, the microstructure modification below the crater surface is investigated, providing new insights into erosion crater phenomena. It demonstrates also that the use of FIB/SEM is ideally suited for assessing the microstructural nature of sub‐micron surface degradation features.

show abstract

Determination of the cathode erosion and temperature for the phases of high voltage discharges using FEM simulations

Cited by 23 publications

References 12 publications

Influence of High Voltage Needle Electrode Material on Hydrogen Peroxide Formation and Electrode Erosion in a Hybrid Gas–Liquid Series Electrical Discharge Reactor

Influence of High Voltage Needle Electrode Material on Hydrogen Peroxide Formation and Electrode Erosion in a Hybrid Gas–Liquid Series Electrical Discharge Reactor

Oxidation Damage of Spark Plug Electrodes

Microstructure Characterisation of Electrical Discharge Craters using FIB/SEM Dual Beam Techniques

Contact Info

Product

Resources

About