Electro-mechanical properties of composite materials for high-current contact applications

Jaćimović, Jaćim; Felberbaum, Laurent; Giannini, E.; Teyssier, J.

doi:10.1088/0022-3727/47/12/125501

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…These liquids have known surface tension polarity and polar and dispersion components. Subsequently, the Owens–Wendt equation was utilized to elucidate the relationship between liquid surface tension, solid surface energy, and the contact angle between the liquid and solid. − γ l false( 1 + cos false( θ false) false) = 2 false[ false( γ s p γ l p ) 1 / 2 + false( γ s d γ l d ) 1 / 2 false] where γ l is the liquid surface energy and θ represents the contact angle between the liquid and solid. The contact angles of water on the gold and AlO x surfaces decreased sharply with an increasing oxygen plasma treatment time, indicating a significant rise in hydrophilicity for both interfaces.…”

Section: Resultsmentioning

confidence: 99%

Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect Transistors

Huang,

Li,

Geng

et al. 2024

ACS Appl. Mater. Interfaces

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A bottom-contact organic field-effect transistor (OFET) is easily adaptable to the standard lithography process because the contact electrodes are deposited before the organic semiconductor (OSC). However, the low surface energy of bare electrodes limits utilizing solution-processed single-crystal OSCs. Additionally, the bare electrode usually leads to a significant charge injection barrier, owing to its relatively low work function (WF). Here, we simultaneously improved the surface energy and WF of gold electrodes by conducting oxygen plasma treatment to achieve high-performance OFET based on solution-processed organic single crystals. We cultivated a thin layer of gold oxide on Au electrodes to increase the WF by ∼0.7 eV. The surface energy of Au electrodes was enhanced to the same as AlO x dielectric surface, enabling the seamless growth of large-area C 8 −BTBT (2,7dioctyl[1]benzothieno [3,2-b][1]benzothiophene) organic single-crystal thin films via solution shearing. This technique facilitates the production of high-performance OFETs with the highest carrier mobility of 6.7 cm 2 V −1 s −1 and sharp switching characterized by a subthreshold swing of 63.6 mV dec −1 . The bottom-contact OFETs exhibited a lower contact resistance of 1.19 kΩ cm than its F 4 -TCNQ-doped top-contact control device. This method offers a straightforward and effective strategy for producing high-quality single-crystal OFETs, which are potentially suitable for commercial applications.

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Section: Resultsmentioning

confidence: 99%

Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect Transistors

Huang,

Li,

Geng

et al. 2024

ACS Appl. Mater. Interfaces

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“…Jaćimović [18] provided a comparison of different silver-based contact materials, tested under direct current (DC) which involves a directional material transfer between the electrodes. In this work, we only focus on contacts for AC circuit breakers, where the electrodes switch polarity after each cycle and material loss from each electrode would be similar.…”

Section: ð1:4þmentioning

confidence: 99%

Effect of WC particle size and Ag volume fraction on electrical contact resistance and thermal conductivity of Ag–WC contact materials

et al. 2015

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In this work, theoretically dense (N 99%) composites of Ag and WC have been prepared by press-sintering-infiltration for making electrical contacts used as an arc-resistant material in a model switching device. Composites with varying silver content and WC particle size were investigated to get an insight on their electrical contact resistance (R c ) and their ability to withstand enormous thermal stresses during switching. A break-only model switching sequence was used, where the evolution of R c was measured over 50 cycles and the post-switching microstructures were investigated for thermal stress induced crack formation. A well-established 2D computational microstructure based model, object-oriented finite element analysis version 2 (OOF2), was used to determine the composite thermal conductivity (k) for various grades as a function of temperature. R c was observed to be consistently low for the coarser WC containing composite and higher silver content composites. This response was attributed to the ductility of the surface layers formed during switching. Crack formation after switching was found to be a direct consequence of large thermal gradients during 50 cycles, which was minimal for coarser WC grained and higher silver content composites which have a higher thermal shock resistance.

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“…However, the poor hardness of copper and its tendency to oxidize at high temperatures limit its use as an electrical contact material [9]. It has been reported that the high-temperature strength of copper alloys can be improved by adding a low volume fraction of well-dispersed ceramic particles, which can effectively improve the arc erosion properties without severely damaging the electrical conductivity of the material [10,11]. Wang et al [12] found that the fine Al 2 O 3 particles resulted in relatively shallow erosion pits in the Cu-Al 2 O 3 composites.…”

Section: Introductionmentioning

confidence: 99%

Erosion behavior and mechanism of Cu-B₄C composites under arc discharge in different atmospheres

Feng

Wang

et al. 2022

Mater. Res. Express

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Ceramic particle-reinforced materials are an important part of high-performance contact materials because of the excellent performance in resistance to arc erosion. In particular, B4C is the ideal choice for the preparation of high-performance electrical contact materials because of its excellent physicochemical properties. In this paper, Cu-B4C composites were prepared by hot-press sintering technology to illustrate the arc erosion behavior of Cu-B4C composites in different atmospheres at high voltages. The erosion morphology and composition of Cu-B4C composites after erosion in air, carbon dioxide and sulfur hexafluoride atmosphere at 8kV were studied. The different erosion mechanisms of Cu-B4C composites in air, carbon dioxide and sulfur hexafluoride atmospheres were systematically discussed. The results showed that the Cu-B4C composites exhibited inhomogeneous erosion in all three atmospheres, and the erosion was mainly concentrated in the region around the B4C particles. In air, the Cu-B4C composites were most severely eroded, but showed better erosion resistance in carbon dioxide and sulfur hexafluoride. The experimental atmosphere decomposed and reacted with copper on the cathode surface at high temperatures, while B4C maintained a good structure after erosion.

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Electro-mechanical properties of composite materials for high-current contact applications

Cited by 10 publications

References 15 publications

Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect Transistors

Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect Transistors

Effect of WC particle size and Ag volume fraction on electrical contact resistance and thermal conductivity of Ag–WC contact materials

Erosion behavior and mechanism of Cu-B₄C composites under arc discharge in different atmospheres

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Electro-mechanical properties of composite materials for high-current contact applications

Cited by 10 publications

References 15 publications

Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect Transistors

Tuning Electrode Work Function and Surface Energy for Solution Shearing High-Performance Organic Field-Effect Transistors

Effect of WC particle size and Ag volume fraction on electrical contact resistance and thermal conductivity of Ag–WC contact materials

Erosion behavior and mechanism of Cu-B4C composites under arc discharge in different atmospheres

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Product

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Erosion behavior and mechanism of Cu-B₄C composites under arc discharge in different atmospheres