Influence Regularity of Aluminum, Copper and Stainless-steel on SF<sub>6</sub> PD Decomposition Characteristics Components

Zeng, Fuping; Luo, Jing; Tang, Ju; Zhou, Qian; Yao, Qiang

doi:10.5370/jeet.2017.12.1.295

Cited by 8 publications

(3 citation statements)

References 14 publications

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“…There have been several experimental studies focusing on the connections between SF 6 decomposition products and PD defect modes when trace moisture and oxygen are present [15][16][17], but the effects of Cu vapor are seldom reported. Zeng [18] carried out experiments to study the influence of free metal particles like Cu, Al and stainless steel on the concentration, formation rate and saturation time of SO 2 F 2 and SOF 2 . Xiao [14] studied the influence of free metal particles of Cu, Al and Fe on the reaction barrier of SF 6 to explain the results of breakdown experiments and found out that the effects of metal particles are obviously larger than those of iron particles.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Fu¹,

Wang²,

Yang³

et al. 2018

J. Phys. D: Appl. Phys.

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The compositions of SF 6 arc plasma are contaminated by Cu vapor through electrode erosion and thus affect the performance of the high-voltage SF 6 circuit breaker. But the essential data for chemical kinetic models to study the non-equilibrium compositions of SF 6 /Cu mixtures, namely the decomposition mechanism of SF 6 /Cu mixtures, is still not clear. Besides, SF 6 decomposition products can be used to diagnose insulation faults of GIS and to evaluate the electric life of the SF 6 circuit breaker, but the uncertainty of the decomposition mechanism of SF 6 /Cu mixtures hinders the application of the analysis method of SF 6 decomposition products. Therefore, this work is devoted to investigating the decomposition mechanism of SF 6 /Cu mixtures by means of density functional theory in conjunction with 6-311G(d,p) basis set (for S and F atoms) and Lanl2DZ basis set (for the Cu atom). The optimized molecular structures, harmonic vibrational frequencies and energetic information of reactants, intermediate products (IM), transition states (TS) and products are thoroughly studied. And the complete decomposition pathways of SF 6 /Cu mixtures involving 15 reactions are derived. Detailed potential energy surfaces of SF 6 + Cu decomposition reactions are also depicted as a result. Among all the decomposition pathways, the favorable decomposition reactions of SF 6 + Cu mixtures are found: reaction R1 contributes more than reaction R2 in the decomposition of SF 6 + Cu mixtures due to its lower energy released; reaction R3 is dominant in the decomposition of SF 5 + Cu other than multi-step reactions; the chemical processes of SF 4 + Cu → IM x → TS y (where x stands for 9, 10 and 13, and y denotes 7, 8 and 9) may play the same role in SF 4 + Cu decomposition, but the reaction rate of R6 is higher than other reactions; reaction R9 and R11 are relative favorable among SF 3 + Cu decomposition reactions; reaction R13 is dominant in the decomposition of SF 2 + Cu because of its high potential well. This work hopes to outline a theoretical basis to investigate the non-equilibrium compositions of SF 6 /Cu arc plasma and the SF 6 decomposition products analysis method.

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Section: Introductionmentioning

confidence: 99%

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Fu¹,

Wang²,

Yang³

et al. 2018

J. Phys. D: Appl. Phys.

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“…It follows from the results of composition calculations and from experimental results (e.g. [30][31][32][33][34]) that in the pressure and temperature ranges examined several pro cesses can be roughly distinguished. Process 1.…”

Section: Reality and Modelmentioning

confidence: 97%

Condensed species in products of the reaction of SF₆with Cu up to 4000 K

Coufal¹,

Toman²

2017

J. Phys. D: Appl. Phys.

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This paper is concerned with condensed species in the equilibrium composition of a system of products of the reaction of sulphur hexafluoride with copper. It is assumed that SF6 is an insulation medium in the circuit breaker and reacts with the Cu contained in the circuit breaker contacts or in other parts of the circuit breaker. The system of products of the reaction of SF6 with Cu is assumed to be in local thermodynamic equilibrium for temperatures ranging from ambient temperature to 4000 K, with the pressure in the system being within an interval from 0.1 MPa to 2 MPa. The occurrence of condensed species and their phase transformations significantly affect the composition and thus also the system properties in a range of temperatures at which arc ignition or arc extinction take place. Data on the condensed species considered are analysed and the effects of the phase rule and the selected theoretical model on the occurrence of condensed species in the equilibrium composition are examined.

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“…One cause for the rapid degradation of ZK60 alloy in physiological environment is that the degradation product layer on ZK60 alloy is a porous and soluble magnesium hydroxide layer, which cannot play a role in preventing further degradation of the Mg matrix [ 17 , 18 ]. As we all know, for metals such as aluminum, titanium, chromium and stainless steel, the high corrosion resistance is put down to the formation of a dense and insoluble corrosion product layer on the alloy surface, thereby preventing the ongoing reaction of an aggressive medium with the alloy matrix [ 19 , 20 ]. Inspired by this idea, two strategies have been put forward to enhance the degradation resistance of ZK60 alloy.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Degradation Resistance of Biomedical Mg-6Zn-0.5Zr Alloy by the Incorporation of Nanodiamond

Liu

Guo

et al. 2022

Materials

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The Mg-6Zn-0.5Zr (ZK60) alloy has attracted extensive attention as one of the hopeful biomedical material candidates for bone implant applications on account of its unique degradability, favorable biocompatibility as well as mechanical compatibility. Nevertheless, the rapid degradation rate in the biological environment is the major hurdle for its clinical application in the field of bone implants. In this study, nanodiamond (ND) was incorporated into ZK60 alloy via selective laser melting technology to enhance its degradation resistance. The results showed that compared with selective laser-melted ZK60 (SLMed ZK60), the selective laser-melted ZK60 with 6 wt.% ND (SLMed ZK60−6ND) possessed the better degradation resistance with the lower degradation rate of 0.5 ± 0.1 mm/year. The enhancement of the degradation resistance was attributed to the fact that ND could promote the deposition of apatite and build up a dense and insoluble protective layer through the dissociation of the carboxyl groups on the ND surface, which could effectively hinder the further degradation of the Mg matrix. Meanwhile, the compressive strength and hardness were improved mainly due to grain refinement strengthening and ND dispersion strengthening. In addition, the SLMed ZK60−6ND possessed good cytocompatibility. These results suggested that the SLMed ZK60−6ND, with enhanced degradation resistance, improved mechanical properties, and good cytocompatibility, was an excellent biomedical material candidate for bone implant applications.

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Influence Regularity of Aluminum, Copper and Stainless-steel on SF₆ PD Decomposition Characteristics Components

Cited by 8 publications

References 14 publications

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Condensed species in products of the reaction of SF₆with Cu up to 4000 K

Enhancing Degradation Resistance of Biomedical Mg-6Zn-0.5Zr Alloy by the Incorporation of Nanodiamond

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Influence Regularity of Aluminum, Copper and Stainless-steel on SF6 PD Decomposition Characteristics Components

Cited by 8 publications

References 14 publications

Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures

Theoretical study of the decomposition mechanism of SF6/Cu gas mixtures

Condensed species in products of the reaction of SF6with Cu up to 4000 K

Enhancing Degradation Resistance of Biomedical Mg-6Zn-0.5Zr Alloy by the Incorporation of Nanodiamond

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Product

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Influence Regularity of Aluminum, Copper and Stainless-steel on SF₆ PD Decomposition Characteristics Components

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Theoretical study of the decomposition mechanism of SF₆/Cu gas mixtures

Condensed species in products of the reaction of SF₆with Cu up to 4000 K