The coating of TiC layer on the surface of nickel by electric discharge coating (EDC) with a multi-layer electrode

Hwang, Yu-Lung; Kuo, Chung-Ming; Hwang, Shun‐Fa

doi:10.1016/j.jmatprotec.2009.11.013

Cited by 61 publications

(32 citation statements)

References 15 publications

(13 reference statements)

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“…Therefore, the current paper proposes the surface modification of sintered NdFeB magnets through electrical discharge with an ordinary copper electrode. The modification mechanism is different from those described in previously published reports (Ref 19,20), and is based on the thermal nature of EDM and on the special property of the NdFeB material. During EDM, each spark melts a small portion of the workpiece.…”

Section: Introductioncontrasting

confidence: 81%

Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method

Wei

et al. 2014

J. of Materi Eng and Perform

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Sintered neodymium-iron-boron (NdFeB) permanent magnets are widely used in many fields because of their excellent magnetic property. However, their poor corrosion resistance has been cited as a potential problem that limits their extensive application. This paper presents an experimental investigation into the improvement of surface corrosion resistance with the ultrasonic-aided electrical discharge machining (U-EDM) method. A scanning electron microscope was used to analyze the surface morphology of recast layers formed through the EDM and U-EDM processes. The chemical structure and elements of these recast layers were characterized using x-ray diffraction and energy dispersive spectroscopy. Corrosion resistance was also studied by means of potentiodynamic polarization, electrochemical impedance spectroscopy, and immersion tests in 0.5 mol/L H 2 SO 4 solution. Experimental results show that an amorphous structure was formed in the recast layer during the EDM and U-EDM processes and that this structure could improve the corrosion resistance of sintered NdFeB magnets. Moreover, the corrosion resistance of U-EDM-treated surface was better than that of the EDM-treated surface.

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Section: Introductioncontrasting

confidence: 81%

Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method

Wei

et al. 2014

J. of Materi Eng and Perform

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“…with porosity and cracking [3]. Similarly, coatings of TiC produced from Ti particles suspended in oil were characterised by cracking and porosity [4].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Defect-free TiC/Si multi-layer electrical discharge coatings

Murray

Cook²,

Senin

et al. 2018

Materials & Design

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The process of electrical discharge coating (EDC) may be used to deposit hard materials on conformal substrate surfaces. Next generation EDM'd components may exploit attachment phenomena to enhance recast layer properties, to avoid the need for recast layer removal. Here, a ceramic based composite layer was developed without cracking and porosity for the first time, using sequential coating using sacrificial TiC and Si electrodes. Attenuation of the discharge process by gap widening using Si debris in the gap explained improved layer properties. Composite coatings combining WC and TiC were also demonstrated, with good elemental intermixing. Attachment level was correlated strongly with melting point, with high melting point materials resisting ejection due to more rapid solidification. Nanoindentation showed the TiC and WC/TiC layers possessed the highest mean hardness

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“…Electrodes fabricated by powder metallurgy have high tendency of surface alloying as compared to conventional metallic electrodes. 7 Hwang et al, 2010 [15] Ni Ti-Gr (Graphite ) Multi layered electrode s Enhancement in the Surface was observed with better surface finish, the cracks were also fund to be reduced. 8 Stambek ova et al, 2012 [16] 5083 Al Si-Fe alloy Micro hardness of 5083 Al enhanced and same happended to corrosion resistance also.…”

Section: Many Typesmentioning

confidence: 98%

Major Developments in EDM Surface Alloying using Composite Material Tool Electrode

Goyal*¹

2019

IJITEE

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Electric Discharge alloying/Coating (EDC) is an emerging field for the surface modification of advanced engineering materials like tool steel, high heat resistance alloy, titanium alloy etc. The advanced engineering materials have good mechanical properties and are used for the engineering applications like dies, aerospace, and automotives. To treat these difficult-to-machine advanced engineering materials with new challenges, numerous advancements in electrical discharge machining (EDM) processes have been carried out. Electrode materials for EDM are usually made up of copper, and its alloys. Proper selection with composition of electrode materials are required to avoid cracks, residual stresses etc during or after Electrical Discharge Machining and at the same time to have better surface finish and material removal rate and lower tool wear rate of the electrode. Further electrodes can be prepared by different methods like powder metallurgy, stir casting technique etc. This paper presents the brief details of effect of different electrodes on the surface and machining characteristics.

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The coating of TiC layer on the surface of nickel by electric discharge coating (EDC) with a multi-layer electrode

Cited by 61 publications

References 15 publications

Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method

Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method

Defect-free TiC/Si multi-layer electrical discharge coatings

Major Developments in EDM Surface Alloying using Composite Material Tool Electrode

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