Laser cladding of layered Zr/Cu composite cathode with excellent arc discharge homogeneity

Guan, Weimian; Gao, Mingyu; Lv, Hao; Yuan, Jie; Chen, Dejiang; Zhu, Tao; Fang, Youtong; Liu, Jiabin; Wang, Hongtao; Tang, Zhigong; Yang, Wei

doi:10.1016/j.surfcoat.2021.127454

Cited by 14 publications

(4 citation statements)

References 40 publications

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“…Y 2 O 3 has a lower work function when compared with Ag [ 45 ]. Guan et al [ 43 , 46 ] noted that the arc movement depends on the distance between the particles of lower work function. Therefore, the Y 2 O 3 particles on the cathode could act as the arc moving sites based on the rule of arc motion.…”

Section: Resultsmentioning

confidence: 99%

Quasi-Continuous Network Structure Greatly Improved the Anti-Arc-Erosion Capability of Ag/Y2O3 Electrical Contacts

et al. 2022

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Ag/Y2O3 has excellent potential to replace Ag/CdO as the environmentally friendly electrical contact material. Using spherical Y2O3 as the starting material, Ag/Y2O3 contacts with a quasi-continuous network structure were successfully fabricated by a low-energy ball milling treatment. The mean size of Y2O3 used ranged from 243 to 980 nm. Due to the differences in the size of Y2O3, Ag/Y2O3 contacts had different primitive microstructures, thereby exhibiting distinctive anti-arc-erosion capabilities. Ag/Y2O3 contact prepared using 243 nm Y2O3 showed the best anti-arc-erosion capability and the most outstanding electrical performance measures, such as low contact resistance, less mass transfer, and no failure up to 105 cycle times. The quasi-continuous network structure formed in the fine-scare was responsible for the excellent electrical performance. The short distance between Y2O3 particles in the network promoted the cathode arc motion, and thus alleviated the localized erosion. The results obtained herein may inspire further attempts to design electrical contacts rationally.

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Section: Resultsmentioning

confidence: 99%

Quasi-Continuous Network Structure Greatly Improved the Anti-Arc-Erosion Capability of Ag/Y2O3 Electrical Contacts

et al. 2022

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“…In recent decades, laser cladding has been widely used to fabricate coatings due to its advantages of high efficiency and low cost [8][9][10][11][12]. As a coating material, a single metal powder or alloy powder plays an indispensable role in laser cladding technology [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Substrate’s Preheating Temperature on the Microstructure and Properties of Ni-Based Alloy Coatings

Liu,

Jin,

et al. 2024

Lubricants

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Laser cladding is a new technology to fabricate a coating on the surface of a metal substrate. The properties on copper substrates are usually not very good due to the high thermal conductivity and reflectivity. The appropriate preheating temperature is helpful to fabricate coatings with good quality and properties, especially for copper substrates. In order to investigate the effect of different preheating temperatures, four coatings with different preheating temperatures (100, 200, 300 and 400 °C) were fabricated via a laser on a copper substrate. The microstructures and properties of four coatings were investigated using SEM, XRD, EDS, a Vickers microhardness meter, a wear tester and an electrochemical workstation. The results show that the elements from Ni-based alloy powder were uniformly distributed among the binding region, which obtained a good metallurgical bonding. The microstructure was mainly composited of cellular, dendrite and plane crystals, and the main reinforced phases were γ (Fe, Ni), Cr0.09Fe0.7Ni0.21, WC and Ni3B. The values of average microhardness of the four coatings were 614.3, 941.6, 668.1 and 663.1 HV0.5, respectively. The wear rates of the four coatings were 9.7, 4.9, 12.5 and 13.3 × 10−5 mm3·N−1·m−1, respectively, which were less than that of the copper substrate (4.3 × 10−3 mm3·N−1·m−1). The decrease in wear rate was due to the existence of the reinforced phases, such as WC, Ni3B, M7C3 (M=Fe, Cr) and Cr0.09Fe0.7Ni0.21. The fine crystals in the coating preheated at 200 °C also improved the wear resistance. Additionally, the minimum values of corrosion current density were 3.26 × 10−5, 2.34 × 10−7, 4.02 × 10−6 and 4.21 × 10−6 mA·mm−2, respectively. It can be seen that the coating preheated at 200 °C had higher microhardness, lower wear rates and better corrosion resistance due to the existence of reinforced phases and fine and uniform crystals.

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“…The copper composites and alloys have played an important role in developing switching contacts, electrodes for electrical discharge machining, welding electrodes, sliding contacts, integrated circuits, materials for load resistance, diverter plates in fusion reactors, high-temperature erosive material [1][2][3][4][5], etc.…”

Section: Introductionmentioning

confidence: 99%

DIAGNOSTICS OF PLASMA OF ELECTRIC ARC DISCHARGE BETWEEN ASYMMETRIC SINGLE-COMPONENT Cu AND Ni ELECTRODES

Murmantsev¹,

Veklich²,

Boretskij³

et al. 2023

Problems of Atomic Science and Technology

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In this work, the radial distributions of parameters of plasma with copper and nickel vapours admixtures in positive column of electric arc discharge were investigated by optical emission spectroscopy. The plasma temperature was determined by the Boltzmann plot technique on the basis of absolute values of radiation intensity of both copper and nickel atomic spectral lines. Concentrations of both kinds of metal atoms of electrode origin were determined by the method of absolute intensities of the corresponding spectral lines of radiation of such plasma.

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Laser cladding of layered Zr/Cu composite cathode with excellent arc discharge homogeneity

Cited by 14 publications

References 40 publications

Quasi-Continuous Network Structure Greatly Improved the Anti-Arc-Erosion Capability of Ag/Y2O3 Electrical Contacts

Quasi-Continuous Network Structure Greatly Improved the Anti-Arc-Erosion Capability of Ag/Y2O3 Electrical Contacts

Effect of a Substrate’s Preheating Temperature on the Microstructure and Properties of Ni-Based Alloy Coatings

DIAGNOSTICS OF PLASMA OF ELECTRIC ARC DISCHARGE BETWEEN ASYMMETRIC SINGLE-COMPONENT Cu AND Ni ELECTRODES

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