Experimental and Numerical Analysis of a Reverse-polarity Plasma Torch for Plasma Atomization

Yin, Zhengxin; Yu, Deping; Zhang, Qingbo; Yang, Shengyuan; Yang, Tong

doi:10.1007/s11090-021-10181-8

Cited by 19 publications

(12 citation statements)

References 36 publications

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“…The main parameters for temperature field and effective plastic strain field analysis are presented in Table 1 . The temperature in the central of the plasma arc could reach more than 1273 K, and the Cu particle heated by plasma can reach above 800 K. [ 22 ] The geometry and mesh of the model are presented in Figure .…”

Section: Methodsmentioning

confidence: 99%

Improvement of Microstructure and Properties of Cu Coatings Prepared with Cold Spraying by Plasma Heating

Wang

Chang

et al. 2022

Adv Eng Mater

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To improve the microstructure and properties of Cu coating prepared by cold spraying, the plasma heating is used during the cold spraying process. The models of Cu particles deposited on a Cu substrate during cold spraying process without/with plasma heating are established and calculated, and the results are compared. The calculated results show that the plasma heating causes copper particles and substrates to produce greater plastic deformation during deposition. The microstructure of Cu coating prepared by cold spraying with plasma heating is experimentally investigated. Plasma heating can effectively reduce the porosity of the copper coating, improve the binding between the coating and the substrate, and reduce the grain size of the coating, which is due to the greater deformation of the copper particles under plasma heating. The experimental results are consistent with the calculation results. The results of the coating immersion experiments show that the corrosion rate of the Cu coating prepared by plasma‐assisted low‐pressure cold spraying is reduced from 1.5 to 0.094 mg cm−2 h compared with the samples prepared without plasma heating under the same conditions, which is due to the reduced porosity of the coating.

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Section: Methodsmentioning

confidence: 99%

Improvement of Microstructure and Properties of Cu Coatings Prepared with Cold Spraying by Plasma Heating

Wang

Chang

et al. 2022

Adv Eng Mater

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“…Furthermore, the location of anode erosion mainly depends on the heat flux brought by the arc and the region where the arc attachment happens on the anode wall [29]. Apart from a long working lifetime, a proper plasma torch should also have high thermal efficiency for less energy depletion [28,30]. However, the numerical expressions of thermal efficiency are quite different in research, due to different concerns about their models and torch functions [16,31].…”

Section: Introductionmentioning

confidence: 99%

“…Yu et al [26,27] provide an optimal design with a convergent-divergent nozzle inside the plasma torch and achieve higher efficiency in processing than before. Comparing different structures of plasma torch in the same operating condition, less erosion of electrodes is found at high arc voltage and low arc current [28]. Furthermore, the location of anode erosion mainly depends on the heat flux brought by the arc and the region where the arc attachment happens on the anode wall [29].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of direct-current (DC) plasma processing for high efficient steel surface modification

Wei¹,

Xu²,

Bennett³

et al. 2022

Preprint

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Nowadays, direct-current (dc) non-transferred arc plasma torch has drawn significant interest from both academia and industry due to the capability to process products in an efficient and convenient way. The core of this technology is to clarify and manipulate the arc behavior at the interior of the torch and produces ideal plasma jets for processing. To solve this problem, a quasi-steady axisymmetric model is built to simulate and compare the arc characteristics in different operating conditions and different nozzle structures. The results uncover distinct aspects of the study on arc characteristics, including the detection of the region of primary arc attachment, the effect of changing operating conditions, and the choking effect caused by torch structure. The thermal efficiency focused on processing substrate is also calculated in this paper. The results show that increasing mass flow rate brings better thermal efficiency, whereas improving the arc current value causes the opposite result. Meanwhile, two types of nozzle are discussed by thermal efficiency, and the wide nozzle is chosen for torch optimization due to its high power efficiency. The secondary arc attachment on the metal substrate is discovered, but its effect on the processing could be ignored for the extremely low electric current value.

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“…Yu et al [25,26] provide an optimal design with a convergent-divergent nozzle inside the plasma torch and achieve higher efficiency in processing than before. Comparing different structures of plasma torch in the same operating condition, less erosion of electrodes is found at high arc voltage and low arc current [27]. Furthermore, the location of anode erosion mainly depends on the heat flux brought by the arc and the region where the arc attachment happens on the anode wall [28].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the location of anode erosion mainly depends on the heat flux brought by the arc and the region where the arc attachment happens on the anode wall [28]. Apart from a long working lifetime, a proper plasma torch should also have high thermal efficiency for less energy depletion [27,29]. However, the numerical expressions of thermal efficiency are quite different in research, due to different concerns about their models and torch functions [16,30].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of direct-current (DC) plasma processing for high-efficient steel surface modification

Wei

Bennett

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Nowadays, direct-current (dc) non-transferred arc plasma torch has drawn significant interest from both academia and industry due to the capability to process products in an efficient and convenient way. The core of this technology is to clarify and manipulate the arc behavior at the interior of the dc plasma torch to produce ideal plasma jets for processing. To solve this problem, a quasi-steady axisymmetric model is built to simulate and compare the arc characteristics in different operating conditions and different nozzle structures of the plasma torch. The results uncover distinct aspects of the study on arc characteristics, including the detection of the primary arc attachment region and its spatial features caused by the choking effect of torch structure. The thermal efficiency focused on processing substrate is also calculated in this paper for estimating the performance of plasma processing. The calculated results show that increasing the mass flow rate brings better thermal efficiency and the greatest promotion is at least 6% in the same current value, whereas improving the arc current value causes the opposite result. Meanwhile, two types of nozzle are compared to the original design in thermal efficiency, where the wide nozzle is chosen for torch optimization due to its best power efficiency. The secondary arc attachment on the metal substrate is discovered though its impact scope is only within a radius of 10 mm from the torch axis, its effect on the processing could be ignored for the extremely low electric current value.

show abstract

Experimental and Numerical Analysis of a Reverse-polarity Plasma Torch for Plasma Atomization

Cited by 19 publications

References 36 publications

Improvement of Microstructure and Properties of Cu Coatings Prepared with Cold Spraying by Plasma Heating

Improvement of Microstructure and Properties of Cu Coatings Prepared with Cold Spraying by Plasma Heating

Numerical analysis of direct-current (DC) plasma processing for high efficient steel surface modification

Numerical analysis of direct-current (DC) plasma processing for high-efficient steel surface modification

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