Effect of the crystallinity of diamond coatings on cemented carbide inserts on their cutting performance in milling

Skordaris, G.; Bouzakis, K.‐D.; Kotsanis, T.; Boumpakis, Apostolos; Stergioudi, F.; Christofilos, D.; Lemmer, O.; Kölker, W.; Woda, Michael

doi:10.1016/j.cirp.2019.04.056

Cited by 12 publications

(7 citation statements)

References 10 publications

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“…The recorded spectra are presented in figure 3. Both MLD and annealed NCD films exhibit a narrow peak at around 1340 cm -1 confirming the high diamond crystalline quality of the coatings and the existence of an sp 3 -bonded phase [12,13]. One more peak appears pronounced at roughly 1150 cm -1 in the Raman spectra of the MLD coated specimens.…”

Section: Crystallinitymentioning

confidence: 66%

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Effect of the crystallinity of NCD and MLD diamond coatings characterized by same level of residual stresses after annealing on their fatigue strength and wear behavior in milling

et al. 2020

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Nano-composite (NCD) and multi-layered (MLD) diamond coatings were deposited on cemented carbide tools using hot filament chemical vapour deposition (HFCVD) techniques. Appropriate annealings were conducted on the examined diamond coatings in order to be characterized by the same level of residual stresses. The crystalline structure of the employed diamond coatings was investigated by conducting Raman spectra. Inclined impact tests at ambient and elevated temperatures were carried out for assessing their temperature-dependent fatigue strength. Moreover, the wear behaviour of diamond coated inserts was investigating in milling aluminum foam. Raman spectra were also conducted on the treated diamond coatings for capturing potential crystalline changes developed due to the exercised thermal and dynamic mechanical loads during cutting. According to the attained results, the coexistence of sp2– and sp3-bonded phases in the cases of MLD diamond coatings results in an accelerated wear development, despite their structure capability to decelerate the crack propagation. As a result, nano-crystalline diamond coatings characterized only by sp3-bonded phase exhibit an improved wear behaviour. The cutting performance of the NCD coated inserts is further improved due to the enhanced tribological properties of the NCD coatings.

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Section: Crystallinitymentioning

confidence: 66%

“…As a consequence, a decomposition of the sp 2 -bonded trans polyacetylene phases takes place when repetitive thermal and mechanical loads both leading to elastic film deformations are simultaneously applied. This could happen during the cutting procedure [13].…”

Section: Crystallinitymentioning

confidence: 99%

Effect of the crystallinity of NCD and MLD diamond coatings characterized by same level of residual stresses after annealing on their fatigue strength and wear behavior in milling

et al. 2020

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“…Various coating morphologies such as microcrystalline, nanocrystalline, and multilayer structures can also affect the tool performance. [ 17 ] Microcrystalline coating structures are characterized by columnar crystal growth with an average crystal size of d Dia,micro = 5 μm. However, the high hardness is morphologically associated with high roughness regarding the arithmetic mean value of the profile coordinate Ra in the range of Ra micro = 1.9 μm.…”

Section: Influences Of Cvd Diamond Coating Adhesionmentioning

confidence: 99%

Ex Situ Residual Stress Analysis of Chemical Vapor Deposited Diamond Coated Cutting Tools by Synchrotron X‐Ray Diffraction in Transmission Geometry

et al. 2021

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“…Diamond coatings deposited on cemented carbide tools are widely used in machining of non-ferrous materials like aluminum alloys, composite and so forth [1][2][3][4][5]. A key issue for ensuring a sufficient diamond coated tool life, especially in milling, is the fatigue strength of diamond coating-substrate interface [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In this context, annealings were carried out using the NCD coated tools for attaining a relaxation of the residual stresses [15]. Moreover, Raman spectra were applied to study the crystallinity of the as deposited as well as annealed diamond coatings [5,16]. Nano-indentations coupled with appropriate finite element method (FEM)-simulations were applied for characterizing the substrate mechanical properties at ambient and at annealing temperature [17].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Interfacial Fatigue Strength and Milling Behavior of Diamond Coated Tools via Appropriate Annealing

et al. 2020

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This article deals with the potential to reduce the amount of the residual stresses in the diamond films on cemented carbide inserts for improving their effective interfacial fatigue strength and thus their wear resistance. In this context, nano-crystalline diamond coatings (NCD) were deposited on cemented carbide inserts. A portion of these coated tools were annealed in vacuum for decreasing the amount of residual stresses in the film structure. The annealing temperature was appropriately selected for keeping the substrate strength properties invariable after the coating annealing. Inclined impact tests at ambient temperature on the untreated and heat-treated diamond coated tools were conducted for evaluating their effective interfacial fatigue strength. Depending upon the impact load, after a certain number of impacts, damages in the film-substrate interface develop, resulting in coating detachment and lifting. Via appropriate FEM (Finite Element Method)-evaluation of the impact imprints, the residual stresses in the diamond film structure were determined. Milling experiments were conducted for evaluating the cutting performance of the coated tools using aluminum foam as workpiece material. A correlation between the interfacial fatigue strength of diamond coatings and their residual stresses affected by annealings contributed to the explanation of the attained cutting results.

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Effect of the crystallinity of diamond coatings on cemented carbide inserts on their cutting performance in milling

Cited by 12 publications

References 10 publications

Effect of the crystallinity of NCD and MLD diamond coatings characterized by same level of residual stresses after annealing on their fatigue strength and wear behavior in milling

Effect of the crystallinity of NCD and MLD diamond coatings characterized by same level of residual stresses after annealing on their fatigue strength and wear behavior in milling

Ex Situ Residual Stress Analysis of Chemical Vapor Deposited Diamond Coated Cutting Tools by Synchrotron X‐Ray Diffraction in Transmission Geometry

Improvement of the Interfacial Fatigue Strength and Milling Behavior of Diamond Coated Tools via Appropriate Annealing

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