Mechanism of Building-Up Deposited Layer during Electro-Spark Deposition

Thamer, Amin D.; Hafiz, Mohammed Hliyil; Mahdi, Baha S.

doi:10.4236/jsemat.2012.24039

Cited by 14 publications

(21 citation statements)

References 2 publications

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“…This is mainly due to a plasma pressure effect and irregular gap space between the electrode and substrate. The plasma pressure splashes the liquid pool generating peaks and valleys of solidified material [1,20]. Once generated, those irregularities led to irregular space [1,20] of electrode with substrate.…”

Section: Surface Morphologymentioning

confidence: 99%

“…The plasma pressure splashes the liquid pool generating peaks and valleys of solidified material [1,20]. Once generated, those irregularities led to irregular space [1,20] of electrode with substrate. The variation of gap space promotes a higher amount of material mainly on the peaks of the deposit where the electrostatic forces prevail.…”

Section: Surface Morphologymentioning

confidence: 99%

“…A wide variety of metals and ceramic/metal deposits are produced by ESD [1,20]. Among them, there are Fe-based alloys [21], superalloys [22][23][24], and magnesium alloys [25].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

2017

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ElectroSpark Deposition (ESD) is a pulsed micro-welding process that is capable of depositing wear and corrosion resistance deposit to repair, improve, and to extend the service life of the components and tools. Major new applications have taken place in gas turbine blades and steam turbine blade protection and repair, and in military, medical, metal-working, and recreational equipment applications. In this study, the ESD technique was exploited to fabricate 2024 aluminum alloy deposit on a similar substrate. The deposits were deposited using different process parameters. Heat input was varied on three levels. The outcoming microstructure was analyzed by optical and scanning electron microscopies. The deposit was characterized by the overlapping of layers with a mixed microstructure. The average hardness was independent from the process parameters. Both porosity inside the deposits and cracks at the deposit/substrate interface were detected. The porosity lowered with the heat input and increased the average length of cracks.

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Section: Surface Morphologymentioning

confidence: 99%

Section: Surface Morphologymentioning

confidence: 99%

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Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

2017

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“…The causes of defects in the electro-spark coating, such as cracks and delamination between the coating material and the substrate, are a research challenge which explains why it is not currently possible to create a coating using the ESD process that is free from the mentioned defects [28][29][30][31][32]. Good mechanical and tribological properties of the coatings can be achieved using hybrid technology which combines vacuum electro-spark alloying, cathodic arc evaporation, and magnetron sputtering [33,34].…”

Section: Introductionmentioning

confidence: 99%

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

et al. 2020

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Electro-spark deposition (ESD) and laser beam machining (LBM) are the technologies using the concentrated energy flux. This paper deals with the issue of the impact of laser modification on the morphology and mechanical properties of carbide/copper coatings produced by electro-spark treatment. The coatings were applied to C45 carbon steel samples using the EIL-8A device. The following three types of electrodes made using the powder metallurgy (PM) hot pressing technique, from copper and tungsten carbide powders of different percentage compositions, were used for the coatings: 25% WC and 75% Cu; 50% WC and 50% Cu; and 75% WC and 25% Cu. Laser modification of the surface layers was performed with an Nd:YAG laser. The research focused on the analysis of the morphology of coatings applied by electro-spark technology before and after laser processing. The analysis of the morphology of electro-spark coatings revealed that the coatings had microcracks and pores. The laser beam machining of ESD coatings led to the homogenization of chemical composition, fragmentation of the structure, and elimination of microcracks. In addition, measurements of porosity, microhardness, adhesion, and analysis of XRD phase composition of the electro-spark coatings were performed. Laser processing proved to have a positive effect on improving the adhesion of coatings and reducing their porosity. This paper also presents a simulation model of heat transfer processes for the case of laser radiation impact on a WC-Cu coating. The developed numerical model, describing the influence of laser treatment on the distribution of temperature fields in the heated material (at a given depth) is of significant importance in the development of treatment technologies. Laser-modified ESD coatings perform anti-wear and protective functions, which enable their potential application in means of transport such as rolling stock.

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“…During the process, energy stored from high voltage capacitors is discharged through an electrode of the material to be deposited. Thus, a small molten part of the material is removed from the electrode and coated to the substrate in the form of a sudden spark [1,2].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of laser-modified electro-sparking coatings

Pliszka¹,

Radek²,

Gądek-Moszczak³

et al. 2018

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The article summarizes research on a method used to improve tribological properties. The paper presents possibilities of using laser surface modification by means of EDM. The performed research confirmed that the concentrated laser beam stream can effectively modify the state of the ESD coating layer, WC-Cu and improve their usability. The work aims to assess the properties of coatings after laser treatment, based on the observation of the newly created structure of the material, the measurement of adhesion and microhardness measurement.

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Mechanism of Building-Up Deposited Layer during Electro-Spark Deposition

Cited by 14 publications

References 2 publications

Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

Study of the Direct Metal Deposition of AA2024 by ElectroSpark for Coating and Reparation Scopes

The Morphology and Mechanical Properties of ESD Coatings before and after Laser Beam Machining

Microstructure of laser-modified electro-sparking coatings

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