Arc erosion behavior of the Al2O3-Cu/(W, Cr) electrical contacts

Zhang, Xiaohui; Zhang, Yi; Tian, Baohong; An, Jingkun; Zhao, Zhuan; Volinsky, Alex A.; Liu, Yong; Song, Kexing

doi:10.1016/j.compositesb.2018.10.040

Cited by 77 publications

(11 citation statements)

References 16 publications

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“…A previous study reported that the annealed Ag-Zr film deposited on polyimide (PI) can produce a new type of particle/film structure [27], which is significantly different from the traditional granular film [28][29][30][31]. Considering that the Ag nanoparticles spontaneously formed on the surface of the annealed Ag-Zr alloy films and the nanophase effects in copper alloys [27,[32][33][34][35][36][37], we attempt to selfgrown Ag nanoparticles with different morphologies on the surface of the deposited Mo-Ag alloy films by adjusting the Ag content at room temperature. If this purpose can be achieved, a new type of SERS substrate with excellent performance can be obtained by combining the Ag nanoparticles with high SERS sensitivity and the Mo-Ag alloy films with good repeatability at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

Lian

Sun

et al. 2020

Nanotechnology Reviews

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Ag nanoparticles/Mo–Ag alloy films with different Ag contents were prepared on polyimide by magnetron sputtering. The effects of Ag contents on the microstructure of self-grown Ag nanoparticles/Mo–Ag alloy films were investigated using XRD, FESEM, EDS and TEM. The Ag content plays an important role in the size and number of uniformly distributed Ag nanoparticles spontaneously formed on the Mo–Ag alloy film surface, and the morphology of the self-grown Ag nanoparticles has changed significantly. Additionally, it is worth noting that the Ag nanoparticles/Mo–Ag alloy films covered by a thin Ag film exhibits highly sensitive surface-enhanced Raman scattering (SERS) performance. The electric field distributions were calculated using finite-difference time-domain analysis to further prove that the SERS enhancement of the films is mainly determined by “hot spots” in the interparticle gap between Ag nanoparticles. The detection limit of the Ag film/Ag nanoparticles/Mo–Ag alloy film for Rhodamine 6G probe molecules was 5 × 10−14 mol/L. Therefore, the novel type of the Ag film/Ag nanoparticles/Mo–Ag alloy film can be used as an ideal SERS-active substrate for low-cost and large-scale production.

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Section: Introductionmentioning

confidence: 99%

Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

Lian

Sun

et al. 2020

Nanotechnology Reviews

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“…Considering that SiC does not change greatly under the action of the arc in this test, only the added phases of SnO 2 and ZnO 2 are considered. The second phase of the electrical contact materials has two main functions: on the one hand, the second phase consumes energy in its own decomposition form to quickly extinguish the arc to reduce the arc energy of the contact materials, thereby reducing the evaporation of the matrix material 24 . For instance, the addition of CdO can effectively accelerate the extinguishing of the electrical arc; on the other hand, the second phase increases the viscosity of the molten metal and reduces the amount of sputtering.…”

Section: Electrical Contact Propertiesmentioning

confidence: 99%

Contrastive Research on Electrical Contact Performance for Contact Materials of Cu-SnO2 and Cu-ZnO2 Alloys

et al. 2019

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Herein, SnO 2 -and ZnO 2 -doped (1.5 wt.%) composite Cu powder was prepared by mechanical alloying (MA) respectively, and both the contact materials of oxide-doped Cu alloys were subsequently obtained by canned hot-pressing powder sintering with hot extrusion combined. Scanning electron microscopy (SEM), laser scanning confocal microscopy (LSCM) and self-designed electrical breakdown device were used for investigating the microstructure and properties including electric conductivity and hardness, especially for electrical contact performance of the Cu-SnO 2 alloy and in compared with the Cu-ZnO 2 alloy. The experimental results show that the hardness of Cu-SnO 2 and Cu-ZnO 2 contact materials are 103.5±1 HV and 192.7±1 HV, respectively, which meet the hardness standard of national standard electrical contact materials. Meanwhile, the relative conductivity %IACS are 7.24% and 6.20%, respectively, which are higher than the traditional Cu-based contact materials. This electrical life simulation test system was designed independently, and the results indicate that the switching times of Cu-SnO 2 contact materials are much more than that of Cu-ZnO 2 . The addition of SnO 2 can effectively improve the arc extinguishing characteristics and the anti-welding performance of the contact materials is enhanced. In summary, SnO 2 -doped Cu-based contact materials possess excellent comprehensive properties, which can provide reference for potential applications in contact materials.

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“…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. Therefore, extensive studies have been undertaken to improve and develop the mechanical and electrical properties of W/Cu contact materials.…”

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:

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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.

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Arc erosion behavior of the Al2O3-Cu/(W, Cr) electrical contacts

Cited by 77 publications

References 16 publications

Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

Contrastive Research on Electrical Contact Performance for Contact Materials of Cu-SnO2 and Cu-ZnO2 Alloys

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

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