Spreading Resistance Probe‐Spacing Experiment Simulations: Effects of Probe‐Current Density and Layer Thickness

1982 ◽  
Vol 129 (12) ◽  
pp. 2788-2795
Author(s):  
John Albers
Keyword(s):  
Layer Thickness ◽  
Current Density ◽  
Spreading Resistance ◽  
Probe Current ◽  
Probe Spacing

Optimization of the Anode Current Collector Layer Thickness for the Cathode-Supported Solid Oxide Fuel Cell

2013 ◽  
Vol 712-715 ◽  
pp. 1325-1329 ◽  
Author(s):  
Wei Kong ◽  
Shi Chuan Su ◽  
Xiang Gao ◽  
Dong Hui Zhang ◽  
Zi Dong Yu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Layer Thickness ◽  
Current Density ◽  
High Performance ◽  
Current Collector ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Anode Current ◽  
Output Current

The influence of anode current collector layer (ACCL) thickness is studied for different ACCL porosity and different pitch width. The results shows conclusively that the output current density depends strongly on the ACCL thickness and a suitable choice of the ACCL thickness is very important for the high performance of a SOFC stack. Furthermore, the optimal ACCL thickness is found to be dependent linearly on the pitch width and the parameters for the linearity are given.

scholarly journals Impact of microarc carburizing and boriding of steel on diffusion layer structure

2021 ◽  
Vol 63 (11-12) ◽  
pp. 929-934
Author(s):  
Yu. M. Dombrovskii ◽  
M. S. Stepanov
Keyword(s):  
Layer Thickness ◽  
Diffusion Layer ◽  
Current Density ◽  
Steel Surface ◽  
Layer Structure ◽  
Heating Temperature ◽  
High Current Density ◽  
Original Structure ◽  
Heterogeneous Structure ◽  
Coal Particles

Intensification of carburizing and boriding of steel parts is achieved by microarc surface alloying. For carburizing, the parts are immersed in coal powder followed by electric current passing. For boriding, a coating with diffusant is used. Acceleration of diffusion is achieved by action of microarc discharges on the steel surface. The aim of this work was to study the effect of diffusion parameters on thickness, structure, and phase composition of coatings. The samples were made of 20 steel. Surface current density was 0.45 – 0.53 A/cm2. Duration of the process was 2 – 8 min. At the beginning of heating, temperature of the samples increases, and then stabilizes at 930 – 1250 °C due to cessation of micro-formation during combustion of coal particles. After carburizing, a eutectoid mixture is formed on the surface, then, the zone with ferrite-perlite structure is located, which transfers into the original structure. The maximum layer thickness (60 – 390 microns) is reached after 6 – 7 min of heating and then does not increase due to a decrease in the carbon potential during combustion of coal particles. Similar relationship is obtained when boriding: the maximum layer thickness (60 – 340 microns) is reached after 6 – 7 min and then does not increase due to depletion of diffusant source in the coating. At current density of 0.45 A/cm2, the layer consists of a base (a dispersed ferrite-carbide mixture) containing fine inclusions of iron borides and boron carbide. At current densities of 0.49 and 0.53 A/cm2, the layer has heterogeneous structure, with areas of high-hard boride eutectic located at the base. At high current density, diffusion of carbon and boron along the grain boundaries forms Fe – C – B triple eutectic. At lower current density, surface temperature is lower than eutectic formation temperature, so heterogeneous coating structure is not formed. The work results make it possible to choose modes of microarc heating to obtain the required parameters of diffusion layer.

Organic Sonoelectrochemistry on Mercury Pool Electrode

2000 ◽  
Vol 65 (6) ◽  
pp. 941-953 ◽  
Author(s):  
Jiří Klíma ◽  
Jiří Ludvík
Keyword(s):  
Mass Transfer ◽  
Layer Thickness ◽  
Diffusion Layer ◽  
Current Density ◽  
Electrode Surface ◽  
Diffusion Layer Thickness ◽  
Local Mass Transfer ◽  
Electrolytic Current ◽  
Mercury Electrodes ◽  
Instantaneous Increase

So far, the influence of sonication on the electrolytic current was studied only at solid or rather miniaturized mercury electrodes. The presented paper reports on sonoelectrochemical experiments at a liquid mercury pool electrode. Two sonoelectrochemical cells have been developed and tested. It was shown that during sonication, the electrolytic current increases in a number of individual peaks representing short local enhancements of current density due to vigorous local mass transfer and instantaneous increase of fresh electrode surface. Both these effects are caused by microjets of solution formed during violent unsymmetric collapses of cavitation bubbles in the close vicinity of the electrode surface. The newly formed electrode surface and the decrease in the diffusion layer thickness were estimated and discussed. An example is presented where the sonication is used for destruction of a film of products formed during electrolysis of cysteine, that otherwise rapidly inhibits continuation of the electrode process.

High-detectivity organic photodetectors based on a thick-film photoactive layer using a conjugated polymer containing a naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole unit

2019 ◽  
Vol 7 (20) ◽  
pp. 6070-6076 ◽  
Author(s):  
Zhaomiyi Zeng ◽  
Zhiming Zhong ◽  
Wenkai Zhong ◽  
Jiaxin Zhang ◽  
Lei Ying ◽  
...  
Keyword(s):  
Thick Film ◽  
Layer Thickness ◽  
Current Density ◽  
Dark Current ◽  
Conjugated Polymer ◽  
Dark Current Density ◽  
Photoactive Layer ◽  
Organic Photodetectors

The detectivity of organic photodetectors obviously enhanced with a photoactive layer thickness as a result of the reduced dark current density.

Texture Evolution along the Layer Thickness in a Fe-3%Si Steel under Electropulsing Treatment

2011 ◽  
Vol 702-703 ◽  
pp. 943-946 ◽  
Author(s):  
Xin Li Wang ◽  
Hong Ming Zhao ◽  
Wen Bin Dai ◽  
Xiang Zhao
Keyword(s):  
Layer Thickness ◽  
Current Density ◽  
High Current Density ◽  
Texture Evolution ◽  
Specimen Thickness ◽  
Evolution Analysis ◽  
Orientation Density ◽  
Current Densities ◽  
The Difference ◽  
Electropulsing Treatment

Effects of electric current densities on recrystallization texture evolution in cold-rolled Fe-3%Si steel were investigated by using a high current density electropulsing treatment. Results showed that the orientation density of α fiber and  fiber varied with the specimen thickness during current passing. However, with the current density increasing, the difference from layer thickness almost vanished. In addition, Goss component texture was the final sharper one but no relation with the specimen thickness at 9.96kAmm-2. By the texture evolution analysis, it was found that the preferred nucleation always occurred in the surface layer due to the high storied energy coursed by previous cold rolling. Combined with the corresponding microstructures, it could be found that though there was an apparent texture evolution along specimen thickness, the microstructure had no change with thickness. In addition, due to the application of electropulsing, the recrystallization nucleation was greatly increased.

Electric properties of barium–strontium titanate thin films deposited by two-step radio-frequency sputtering

2001 ◽  
Vol 16 (9) ◽  
pp. 2680-2686 ◽  
Author(s):  
J. S. Fang ◽  
C. T. Chang ◽  
T. S. Chin
Keyword(s):  
Thin Films ◽  
Radio Frequency ◽  
Layer Thickness ◽  
Leakage Current ◽  
Leakage Current Density ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Current Density ◽  
Dielectric Breakdown ◽  
Barium Strontium

Barium-strontium titanate (BST) thin films were prepared by a two-step deposition using radio-frequency magnetron sputtering on Pt/Ti/SiO2-buffered Si(100) substrate. The initial BST layer thickness and intermediate annealing strongly affect the resultant electric properties of the two-step BST thin films. The optimal two-step BST films, with a first-layer thickness of 30 nm intermediate annealed at 610 °C under 1 torr oxygen. The dielectric breakdown and leakage current density of the two-step film are above 625 kV/cm and 9.5 nA/cm2 at 100 kV/cm, respectively, compared with 400 kV/cm and 17 nA/cm2 for the one-step films. We conclude that the two-step deposition dramatically improves dielectric breakdown and enhances leakage current density while keeping the dielectric constant uninfluenced.

Sign in / Sign up

Export Citation Format

Share Document