Electrical-Discharge Machining of Tungsten Carbide (WC) and its composites (WC-Co) – A Review

Bhadauria, Gaurav; Jha, Shivesh; Roy, B. N.; Dhakry, Nonihal Singh

doi:10.1016/j.matpr.2018.10.274

Cited by 13 publications

(13 citation statements)

References 31 publications

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“…Wire EDM is used for machining simple geometries whilst die-sinking EDM is widely used for processing complex-shaped geometries. Other variants of EDM have also been developed for specific applications and include micro-EDM, powder EDM and dry EDM [124]. [122].…”

Section: Edm Operating Principlesmentioning

confidence: 99%

“…The differences in the melting and evaporation temperatures allow the cobalt to become eroded first, leaving tungsten carbide grains on the surface [125]. This results in the formation of a rough surface with the presence of pin holes, micro voids, and cracks [124], [128]. Separation of WC grains from cobalt also causes a change in the gap between the electrodes, resulting in abnormal discharge rates [129].…”

Section: Edm Of Wcmentioning

confidence: 99%

“…The suitability of EDM as a finishing technique can be reviewed depending on the most desired outcomes which include the coating's surface and sub-surface integrity, surface finish, machining speed and costs associated with electrode wear. [124,128]. Reprinted with permission from [124,128]; 2018, 2003 Elsevier.…”

Section: Edm Of Wcmentioning

confidence: 99%

“…[124,128]. Reprinted with permission from [124,128]; 2018, 2003 Elsevier. Janmanee et al found through experimental analysis that an optimal MRR of 2.731 mm 3 /min, EWR of 37.2%, and microcrack density of 183.87 µm/mm 2 were achieved by using graphite electrodes on 90WC-10Co coating at a discharge current of 75 A.…”

Section: Edm Of Wcmentioning

confidence: 99%

“…Despite the elimination of mechanical stresses on the workpiece, EDM still poses a problem resulting from the thermal stress involved in the process where the melted material is rapidly [124,128]. Reprinted with permission from [124,128]; 2018, 2003 Elsevier.…”

Section: Heat Affected Zone and Oxidationmentioning

confidence: 99%

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Recent Progress in Precision Machining and Surface Finishing of Tungsten Carbide Hard Composite Coatings

Micallef

Zhuk²,

Aria

2020

Coatings

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Owing to their high hardness, fracture toughness and oxidation resistance, tungsten carbide (WC) coatings are extensively deposited on parts that operate in demanding applications, necessitating wear, erosion, and corrosion resistance. The application of thick and hard WC coatings has an inevitable effect on the original dimensions of the parts, affecting the geometrical tolerances and surface roughness. The capability of achieving a sub-micron surface finish and adhere to tight geometrical tolerances accurately and repeatably is an important requirement, particularly with components that operate in high-precision sliding motion. Meeting such requirements through conventional surface finishing methods, however, can be challenging due to the superior mechanical and tribological properties of WC coatings. A brief review into the synthesis techniques of cemented and binderless WC coatings is presented together with a comprehensive review into the available techniques which are used to surface finish WC-based coatings with reference to their fundamental mechanisms and capabilities to process parts with intricate and internal features. The binderless WC/W coating considered in this work is deposited through chemical vapour deposition (CVD) and unlike traditional cemented carbide coatings, it has a homogenous coating structure. This distinctive characteristic has the potential of eliminating key issues commonly encountered with machining and finishing of WC-based coatings. Here, six contact and non-contact surface finishing techniques, include diamond turning, precision grinding, superfinishing, vibratory polishing, electrical discharge machining, and electropolishing are discussed along with their current use in industry and limitations. Key challenges in the field are highlighted and potential directions for future investigation, particularly on binderless WC coatings, are proposed herein.

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Section: Edm Operating Principlesmentioning

confidence: 99%

Section: Edm Of Wcmentioning

confidence: 99%

Section: Edm Of Wcmentioning

confidence: 99%

Section: Edm Of Wcmentioning

confidence: 99%

Section: Heat Affected Zone and Oxidationmentioning

confidence: 99%

See 3 more Smart Citations

Recent Progress in Precision Machining and Surface Finishing of Tungsten Carbide Hard Composite Coatings

Micallef

Zhuk²,

Aria

2020

Coatings

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The Comparative Third‐Order Nonlinearities of Titanium Carbide and Tungsten Carbide in the Visible Regain

Nadafan,

Majidi,

Khashehchi

et al. 2023

Cryst. Res. Technol.

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This study investigates the structure and properties of Titanium carbide (TiC) and Tungsten carbide (WC) nanoparticles. The X‐ray diffraction patterns confirm the presence of a hexagonal structure in WC nanoparticles and cubic structure in TiC nanoparticles. Transmission electron microscopy analysis reveals the particle sizes to be within the range of 30–50 nm. The bandgap of TiC and WC nanoparticles are 3.5 and 3.6 eV, respectively based on diffuse reflectance spectroscopy (DRS) along with Kubelka–Munk. Furthermore, the optical phonons and dielectric function of WC and TiC nanoparticles are investigated using the reflectance spectra along with the Kramers–Kronig (KK) method. Furthermore, the Z‐scan technique, employing a Nd:YAG laser operating at a wavelength of 532 nm, is utilized to assess the nonlinear optical (NLO) characteristics of WC and TiC nanoparticles. The open aperture Z‐scan measurements of WC nanoparticles indicate reverse saturable absorption (RSA) behavior and a positive nonlinear refraction (NLR) coefficient. On the other hand, TiC nanoparticles show RSA behavior with a negative NLR effect. The order of NLR, nonlinear absorption coefficient, and the susceptibility of TiC and WC are 10−8 cm2 W−1, 10−4 cm W−1, and 10−6 esu, respectively.

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Influence of cutting parameters on PCD tool wear during milling tungsten carbide

Li,

Zhao,

Gao

et al. 2023

Int J Adv Manuf Technol

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Electrical-Discharge Machining of Tungsten Carbide (WC) and its composites (WC-Co) – A Review

Cited by 13 publications

References 31 publications

Recent Progress in Precision Machining and Surface Finishing of Tungsten Carbide Hard Composite Coatings

Recent Progress in Precision Machining and Surface Finishing of Tungsten Carbide Hard Composite Coatings

The Comparative Third‐Order Nonlinearities of Titanium Carbide and Tungsten Carbide in the Visible Regain

Influence of cutting parameters on PCD tool wear during milling tungsten carbide

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