Manufacturing and Characterization of a Carbon-Based Amorphous (a-CNX) Coating Material

Rashid, Md. Masud-Ur; Archenti, Andreas

doi:10.1007/s41871-018-0014-y

Cited by 5 publications

(7 citation statements)

References 70 publications

(111 reference statements)

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“…In temperature measurement terms, the temperature difference of the coolant is likely to decrease because the EM fields are theoretically better coupled with the core of the plasma. For this research, the focus is to present an alternative method for in-process monitoring of the torch efficiency, typically for the plasma surface applications, e.g., plasma torch etching [ 24 ], surface treatment [ 25 ] and coating [ 26 , 27 ].…”

Section: Discussionmentioning

confidence: 99%

Power Dissipation of an Inductively Coupled Plasma Torch under E Mode Dominated Regime

Jourdain

Gourma

et al. 2021

Micromachines

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This paper focuses on the power dissipation of a plasma torch used for an optical surface fabrication process. The process utilizes an inductively coupled plasma (ICP) torch that is equipped with a De-Laval nozzle for the delivery of a highly collimated plasma jet. The plasma torch makes use of a self-igniting coil and an intermediate co-axial tube made of alumina. The torch has a distinctive thermal and electrical response compared to regular ICP torches. In this study, the results of the power dissipation investigation reveal the true efficiency of the torch and discern its electrical response. By systematically measuring the coolant parameters (temperature change and flow rate), the power dissipation is extrapolated. The radio frequency power supply is set to 800 W, E mode, throughout the research presented in this study. The analytical results of power dissipation, derived from the experiments, show that 15.4% and 33.3% are dissipated by the nozzle and coil coolant channels, respectively. The experiments also enable the determination of the thermal time constant of the plasma torch for the entire range of RF power.

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Section: Discussionmentioning

confidence: 99%

Power Dissipation of an Inductively Coupled Plasma Torch under E Mode Dominated Regime

Jourdain

Gourma

et al. 2021

Micromachines

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“…7a and b. The detail characteristics of peak discharge current-voltage waveform of reactive-HiPIMS deposition of a-CNx coating material is described in [22] Form Fig. 8 it can be observed that at the beginning of the pulse in 'ignition phase' though the cathode voltage reaches to its peak value instantly (-750 V), the plasma ignition is delayed by 10 to 12 µs.…”

Section: Machining Test Setupmentioning

confidence: 96%

“…The substrate samples (shims and steel discs for material characterization) were mechanically and chemically cleaned. Details of this procedure is described in [22] Before starting the multilayer coating synthesis process, in-situ high pressure Ar gas plasma cleaning as well as low pressure HiPIMS metal ion plasma cleaning of the substrate were done. The multilayer coating was deposited at ambient temperature and no external heat was applied to the substrate.…”

Section: Coating Thickness Calculationmentioning

confidence: 99%

Advanced multi-functional coatings for vibration control of machining

Rashid¹,

Guo²,

Adane³

et al. 2020

Journal of Machine Engineering

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The paper present theoretical and experimental studies of the energy dissipation performance of a composite structure composed in a multilayer nano-composite damping coating applied on a tungsten carbide shim and placed beneath the cutting insert. The coated shim placed closed to the cutting zone is subjected to high compressive and shear stresses as well as high temperature. Therefore, apart from high damping capacity it requires high stiffness and high thermal resistance. The coated shim dissipates the high frequency oscillations produced at the tool-chip and tool-workpiece interfaces during the chip forming process. The use of coated shims demonstrates that the tool life is considerably extended, while the machined surface integrity is improved. The Reuss model of the composite structure composed of a phase with a stiff, low loss factor and a phase with high loss factor is used to calculate the optimal coating thickness that gives high loss factor combined with high stiffness. The synthesis process of the coating material using HiPIMS process is discussed. The physical characteristics of the coating and the machining performance are presented in the experimental section.

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“…Due to high current-density (0.61 A/cm 2 ) and reduced plateau discharge (pulse frequency 170 Hz and pulse length 70 µs), the high ion flux density at the substrate position facilitates growth of the densely packed microstructure [34,35]. The structure can be characterized as amorphous since no structure such as particles, agglomerates, or porous clusters are observed from SEM micrographs [2]. No periodic nanostructure can be observed, which was clearly visible in [4,5].…”

Section: Cu:cucn X Coating Morphologymentioning

confidence: 99%

“…For high-precision machining, a vibration-dampening mechanism close to the source of the vibration, i.e., at the cutting zone, not only increases cutting tool life but can also improve productivity and increase quality [1]. Magnetron-sputtered carbon-nitride coating (CN x ) exhibiting high elasticity and adequate hardness can potentially be used for improving cutting tool dynamic stiffness [2] and for reducing the friction coefficient of higher load-capacity bearings [3]. Metal and metal-matrix carbon-nitride multilayered nanocomposite coating can improve milling tools' cutting stability limit [4] and suppress chatter in the turning process [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Pre-Treatment on the Adhesion between HiPIMS Thick Cu:CuCNx Coating and WC-Co Shim

2022

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High-power impulse magnetron-sputtering thick metal/carbon–nitride-doped metal-matrix multilayer nano-composite coating can be applied to cutting-tool holder components to improve cutting insert’s life. One of the challenges of such an add-on solution is the poor adhesion between the thick coating and the hard alloy substrate, such as WC-Co shim. This work presents a study on WC-Co substrate surface preparation methods for HiPIMS coating and its adhesion improvement. Three mechanical surface pretreatment methods were investigated: machining (grinding), diamond polishing, and grit blasting. White-light interferometry was used for substrate surface texture measurement before and after pretreatment. It was demonstrated that, compared to machining and diamond polishing, grit blasting can significantly improve the interface adhesion between the ~200 µm-thick Cu:CuCNx coating and WC-Co shim. Grit blasting was also found to be beneficial for improving the cutting insert’s life in the external turning process. In turning tests, the coating lifetime for grit-blasted shim was more than 90 minutes, whereas the coating lifetimes for machined shim (conventional shim) and diamond-polished shim were ~85 minutes and ~70 minutes, respectively. Further, by comparing the HiPIMS gradient chromium pre-layer between the coating and substrate for the different shims, the study also explained that the quasi-isotropic surface texture of grit-blasted shim is more advantageous for coating–substrate interface adhesion.

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Manufacturing and Characterization of a Carbon-Based Amorphous (a-CNX) Coating Material

Cited by 5 publications

References 70 publications

Power Dissipation of an Inductively Coupled Plasma Torch under E Mode Dominated Regime

Power Dissipation of an Inductively Coupled Plasma Torch under E Mode Dominated Regime

Advanced multi-functional coatings for vibration control of machining

Effect of Surface Pre-Treatment on the Adhesion between HiPIMS Thick Cu:CuCNx Coating and WC-Co Shim

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