Arc erosion behavior and mechanism of Cu/Cr20 electrical contact material

Shunxin, Zhu; Liu, Yong; Tian, Baohong; Zhang, Yi; Song, Kexing

doi:10.1016/j.vacuum.2017.06.002

Cited by 40 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, the spots are moved from one site to next site through deflection and jumping rather than smoothly moving, thus resulting in the slightly improved arc corrosion performance. From above analysis, in order to achieve low voltage and ultra-high arc discharge cycles for the CuZr [12] or CuCr [17] alloys, the problem of arc erosion can be solved using the method which can produce uniform dispersed secondary particles in Cu-Cr-Zr alloys. Arc breakdown times/ nnmber Furthermore, Cu-Cr-Zr alloys after the different treatments have different first breakdown spots, and the number of spots in commercial alloy is reduced (see Fig.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Arc ablation behavior and microstructure evolution of plastically deformed and micro-alloyed Cu–Cr–Zr alloys

Zhou

Chen

Feng

et al. 2020

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Zr alloys are often subjected to premature failures due to arc erosion at moment of their breakdown. In this paper, a series of simulated high-voltage arc ablation experiments were conducted to systematically investigate arc ablation characteristics of Cu-Cr-Zr alloys, their microstructure evolutions and anti-ablation properties after plastic deformation and microalloying. Results showed that during their arc ablation processes, a halo pattern was firstly formed on the surface under the action of high-temperature arc. This is followed by partial melting and splashing of Cu, forming of uneven and rough surfaces, and finally significant burning of the alloy. The degree of ablation of alloy is aggravated with the increased breakdown voltage. Due to a combined effect of solid solution strengthening, fine grain strengthening and deformation strengthening, the ablation resistance of the micro-alloyed and plastically deformed alloy has been significantly improved. The breakdown field strengths of commercial Cu-Cr-Zr alloy, heat-treated and deformed one, micro-alloyed and heat-treated one are 1.46×10 6 V/m, 1.67×10 6 V/m and 1.90×10 6 V/m, respectively. However, the breakdown strength of alloys after microalloying is unstable. Results show that there are no preferred phases formed after the first breakdown of arc ablation of Cu-Cr-Zr alloys. The second-phase particles with high-hardness and high-melting temperature hinder the splashing and flow of the molten copper, and inhibit the movement of the cathode spots during the ablation process.

show abstract

Section: Experimental Methods and Materialsmentioning

confidence: 99%

“…To the best of our knowledge, there are no reports on the studies of arc ablation behavior of Cu-Cr-Zr alloys, and the current research on the anti-ablation properties are mainly focused in pseudo Cu-based alloys such as CuZr [12], WCu [13,14] and CuCr [15][16][17]. Li et al [12] investigated air anti-erosion properties.…”

mentioning

confidence: 99%

Arc ablation behavior and microstructure evolution of plastically deformed and micro-alloyed Cu–Cr–Zr alloys

Zhou

Chen

Feng

et al. 2020

Journal of Alloys and Compounds

View full text Add to dashboard Cite

show abstract

“…Therefore, the electrical contact materials (ECMs) need to have excellent combinational properties such as acceptable mechanical properties, thermal conductivity, and wear resistance to be practically reliable. 12 W/Cu alloys are extensively used in different electronic devices such as circuit breakers and switches due to their outstanding properties such as high sputtering resistance, high electrical and thermal conductivity and excellent resistance to arc erosion. 13–15 In a circuit breaker, the contact material must be able to bear ultra-high-voltages, while conventional W/Cu contacts cannot fulfill this requirement.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and experimental investigation of arc erosion behavior in W/Cu functionally graded composites

Mahdavinejad

Khajeafzali

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

In this study, a functionally graded composite (FGC) technique is proposed to produce an electrical contact material made of W/Cu alloy. The prepared composite was sintered and subjected to high-voltage vacuum arc erosion. The composite properties and microstructure are carefully studied based on SEM images before and after exposure to vacuum arc discharge. According to the necking phenomenon observed in the electron micrographs and the quantitative analysis of the particle size, it is evident that the intermediate layer of W/Cu FGC has been in the final stage of the sintering process. The present porosity of FGC samples was less than mono-layered composite (MLC) samples, and the minimum porosity was observed in the three-layered FGC that composed of W70/Cu30 in the first layer. The average hardness of FGC samples was 4% higher than that of MLC samples with an identical composition. The results of the erosion behavior assessment were used to determine the possible arc erosion mechanism. The weight loss was diminished upon erosion when the W/Cu alloys had more than one layer, especially in four-layered FGC. The result also revealed that FGC samples, especially the four-layered composite, had improved heat transfer and prevented heat concentration on the contact surfaces due to higher content of Cu particles in the successive layers and consequently reduced the surface damage.

show abstract

“…Among several studies that have been done to investigate electrical contacts erosion during switchgear operation [8][9][10][11][12][13][14], arc spectroscopy can provide detailed information of contacts erosion as a result of arc interface [15,16]. The interface of thermal arc plasma and electrical contacts surfaces causes evaporation of the contacts surfaces.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Investigation of Metal Content in Prestrike Arc During Making Operation in a Low-Current Model Switch

Dorraki

Niayesh

2020

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Energy dissipation during pre-strike arc is the critical factor for electrical contacts erosion and welding in medium voltage load break switches. Using air-filled devices as an alternative to SF6, makes the switch environmentally friendly, but leads to a more challenging process due to a higher pre-strike arcing time between contacts. Therefore, understanding the erosion process of electrical contacts is crucial to improve the switch lifetime. Determination of contacts surface evaporation by optical emission spectroscopy is one of the most precise methods to investigate the pre-strike arc interface with the contacts. In this paper, the temporal and spatial profiles of copper and tungsten emitted species during pre-strike arc are presented. For this purpose, a circuit consisting of a synthetic DC high voltage part is used to initiate the arc. The temporal evolution of CuI, CuII, and WI shows evaporation of the cathode and the anode surfaces during the pre-strike arc, and the spatial profiles show an inhomogeneous distribution of the vapors alongside the arc root.

show abstract

Arc erosion behavior and mechanism of Cu/Cr20 electrical contact material

Cited by 40 publications

References 17 publications

Arc ablation behavior and microstructure evolution of plastically deformed and micro-alloyed Cu–Cr–Zr alloys

Arc ablation behavior and microstructure evolution of plastically deformed and micro-alloyed Cu–Cr–Zr alloys

Fabrication and experimental investigation of arc erosion behavior in W/Cu functionally graded composites

Spectroscopic Investigation of Metal Content in Prestrike Arc During Making Operation in a Low-Current Model Switch

Contact Info

Product

Resources

About