Surface Engineering of Tungsten Carbide Tool Material by Nano and Microcrystalline Diamond Coatings

Najar, Kaleem Ahmad; Islam, Shah Aarif Ul; Sheikh, Neyaz Ahmad

doi:10.1007/978-3-030-43232-4_7

Cited by 2 publications

(4 citation statements)

References 24 publications

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“…Figure 2 a illustrates the XRD pattern of NCD coating for each coating thickness. NCD coating was characterized by the occurrence of full width at half-maximum properties at a diffraction angle of 44°, which corresponded to the (111) plane of the cubic diamond, as shown in Figure 2 b [ 14 , 15 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of Coating Thickness on Abrasion and Cutting Performance of NCD-Coated Ball Endmills on Graphite Machining

Lee

Park

et al. 2023

Micromachines

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Nano-crystalline diamond (NCD) coating to improve the performance of cutting tools, as the coating thickness varies, the cutting performance and lifespan of the tool varies because the radius of its cutting edge and coating surface roughness are altered. Therefore, an in-depth analysis on the impact of the variations in coating thickness on the cutting tool abrasion and quality of machined surface is necessary. In this study, two NCD ball endmills were coated with 8 and 12 μm thicknesses, and the tool abrasion and roughness of the machined plane were observed after milling. Furthermore, the morphology of the coated surface and abrased cutting edge were observed using a 3D confocal microscope. Consequently, we observed that individual nodules were formed on the continuous aggregates as the coating thickness increased, which increased the coated surface roughness. The two damage modes of the aggregation determined the dominant abrasion that occurred on the cutting edges of both types of coating thicknesses. Delamination and crater wear caused a sharp increase in the roughness of the machined surface. In summary, the increase in coating thickness delayed the delamination of the coating but increased the roughness of the cutting edge, which reduced the machined surface roughness.

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Section: Methodsmentioning

confidence: 99%

Effect of Coating Thickness on Abrasion and Cutting Performance of NCD-Coated Ball Endmills on Graphite Machining

Lee

Park

et al. 2023

Micromachines

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“…The X-ray diffraction (XRD) patterns of the substrate and MCD and NCD coatings are shown in Figure 1 a. Only a peak corresponding to tungsten carbide was observed for the substrate, while peaks at diffraction angles of 44° and 75.5°, which correspond to crystalline planes (111) and (222) of a cube diamond, respectively, were observed on the MCD and NCD coating surfaces [ 13 ]. At the diffraction angle corresponding to crystalline plane (111), for the MCD coating, the peak of the XRD pattern had a higher intensity than that of the NCD coating but a narrower width.…”

Section: Methodsmentioning

confidence: 99%

“…The measured surface roughness (Ra) was 0.618 μm for the MCD coating and 0.622 μm for the NCD coating, as shown in Figure 4 a. The roughness of the NCD coating was slightly larger because the thickness and surface roughness of the nanocoating film changed in proportion [ 13 , 15 ]. Najar et al [ 13 ] claimed that the thickness of a nanocoating film is typically 3 μm, and when the process variable is adjusted to increase the thickness, the surface roughness also increases.…”

Section: Methodsmentioning

confidence: 99%

“…The roughness of the NCD coating was slightly larger because the thickness and surface roughness of the nanocoating film changed in proportion [ 13 , 15 ]. Najar et al [ 13 ] claimed that the thickness of a nanocoating film is typically 3 μm, and when the process variable is adjusted to increase the thickness, the surface roughness also increases. In this study, we deposited the NCD coating to obtain a thickness of 8–10 μm for comparison with the MCD coating.…”

Section: Methodsmentioning

confidence: 99%

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Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills

2022

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The high-purity G5 graphite material is widely used for glass moulding and provides high hardness and brittleness because it is sintered to fine particles unlike other graphite materials. Hence, tool cutting of a G5 workpiece is performed by local fracture instead of plastic deformation of the machined surface. Although a diamond-coated tool with outstanding hardness is used to machine very hard graphite, the tool shows variability regarding the service life and machining performance depending on the grain size, even in the same machining environment. We investigated the wear and change trend of machined surface roughness considering microcrystalline diamond (MCD) and nanocrystalline diamond (NCD)-coated tools, which are generally used to machine graphite materials, and analysed their relation with coating. For rough machining, the MCD-coated tool, for which the delamination of coating occurred later, showed less wear and improved machined surface roughness. For precision machining, the NCD tool showed less tool wear rate relative to the cutting length, leading to a small difference in the machined surface roughness between the two tools. We conclude that if rough and precision machining processes are performed using the same cutting tool, the MCD-coated tool is advantageous in terms of service life, while the difference in roughness of the final machined surface between the tools is negligible.

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Surface Engineering of Tungsten Carbide Tool Material by Nano and Microcrystalline Diamond Coatings

Cited by 2 publications

References 24 publications

Effect of Coating Thickness on Abrasion and Cutting Performance of NCD-Coated Ball Endmills on Graphite Machining

Effect of Coating Thickness on Abrasion and Cutting Performance of NCD-Coated Ball Endmills on Graphite Machining

Analysis of Tool Wear and Roughness of Graphite Surfaces Machined Using MCD and NCD-Coated Ball Endmills

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