Plasma Oxidation Printing into DLC and Graphite for Surface Functionalization

Aizawa, Tatsuhiko; Wasa, Kiyotaka; Nogami, Yoshiro

doi:10.3390/c5010011

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…As stated in [15], various defects were induced into DLC films during PVD (Physical Vapor Deposition) and CVD processes. In the present study, MF-PECVD was utilized to synthesize the thick DLC film with much less amount of defects [13][14]. To demonstrate the homogeneity of MF-PECVD DLC coating, the coating process under the pressures of 2.5 Pa and 3 Pa was stopped to prepare each growing DLC films for hardness testing.…”

Section: Resultsmentioning

confidence: 99%

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Imprinting of Micro-/Nano-Textures onto Metals and Alloys with Use of the Laser-Printed DLC-Die

Aizawa¹,

Inohara²

2022

KEM

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This paper focused a two-step procedure to imprint the tailored emblems, patterns, symbols and codes onto the metallic and polymer product surfaces. The laser printing was first used to form these tailored micro-/nano-textures onto a Diamond-Like Carbon (DLC) coating die. The DLC film with the thickness of 20 mm and the hardness of 22 GPa was utilized as a mother die. Femtosecond laser printing was used to shape the tailored micro-/nano-textures on this die. Seven emblems such as a star-patterned texture with the maximum depth of 4 mm were just cut into the DLC-die to have color-grating by micro-texturing and surface plasmonic brilliance by nanotexturing. In second, Computer Numerical Control (CNC) – stamping was used to imprint these textures onto the aluminum alloy plate with the thickness of 1 mm. Scanning Electron Microscopy (SEM) and three dimensional profilometer were used to investigate the geometric accuracy in this two-step printing procedure. The constituent micro-/nano-textures of each emblem was accurately imprinted onto the aluminum work. The optical properties were also duplicated together with this geometric imprinting.

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Section: Resultsmentioning

confidence: 99%

“…Die and work materials. A SKD11 substrate with 100 mm x 100 mm was DLC-coated by Medium Frequency (MF) -Plasma Enhanced Chemical Vapor Deposition (PECVD) method as reported in [13][14]. The DLC-coating die was cut from this mother plate and finished to a die shape.…”

Section: Methodsmentioning

confidence: 99%

Imprinting of Micro-/Nano-Textures onto Metals and Alloys with Use of the Laser-Printed DLC-Die

Aizawa¹,

Inohara²

2022

KEM

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“…As discussed in [5][6][7][8], the graphene solid with higher thermal conductivity than copper was utilized as a thermal spreader from the GaN chips to the substrate in order to preserve the integrity of semiconductor packages. In this heat transportation design, higher thermal conductivity than 1000 W/K was fully utilized for fast and homogeneous thermal spreading to prevent the GaN-chipped package from thermal damages.…”

Section: Introductionmentioning

confidence: 99%

Heat Transportation by Acicular Micro-Textured Device with Semi-Regular Alignment

Aizawa,

Nakata,

Nasu

2024

Heat Transfer - Advances in Fundamentals and Applications

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Heat transportation device was developed to improve the cooling capacity through the heat convection process and to make low-temperature radiation from the heat source to the objective body in vacuum. This device consisted of the metallic substrate and the acicular micro−/nano-textures in semi-regular alignment. The micro-cone unit cell size and pitch in these textures was controllable by tuning the total current and the current density in the electrochemical processing. Four devices with various unit cell sizes and pitches were prepared for geometric characterization by SEM (Scanning Electron Miscopy) and for spectroscopic analyses on the IR-emittance by FT-IR (Fourier Transform-InfraRed) spectroscopy. Heat radiation experiment was performed to describe the heat transportation in vacuum from the heat source at 323 K to the objective plate. The texture size effect on the low-temperature heat radiation was investigated to build up a physical model for this heat radiation device. Heat convection experiment was also performed to describe the cooling capacity of device under the forced air flow. The unit cell height effect on the cooling behavior was discussed to deduce the physical model for this heat convection device. These models were considered to be used in the computational fluid mechanics simulations.

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“…Diamond-like carbon (DLC) coatings have widespread industrial applications for their low friction coefficient [1][2][3][4], corrosion-resistance [5][6][7], biocompatibility [8], high hardness [9], chemical inertness [10][11][12][13][14][15], surface functionality [16], etc. However, the coatings suffer failures on substrates, mostly due to intrinsic stress [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Molybdenum Content on Mechanical and Tribological Properties of Diamond-Like Carbon Coatings over Titanium β-21S Alloy

Padmanaban

Mohan

Giri

et al. 2020

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Molybdenum-doped diamond-like carbon (Mo-DLC) coatings have been deposited on titanium β-21S alloy (Ti–15Mo–3Nb–3Al–0.2Si) using plasma-enhanced chemical vapor deposition (PECVD) equipped with pulsed-DC magnetron sputtering. Mo contents in the deposited coatings have been controlled with an applied sputtering pulse duty cycle. Chemical composition, structure, morphology, and topography have been studied using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM), respectively. XRD pattern of the coating with highest Mo content shows the presence of carbide phase. Smooth features with low roughness values are observed in low Mo content coating, whereas high Mo content coating shows granular characteristics with a high roughness value. Raman spectra reveal the increased graphitic content for the highest metal concentration in the coatings, wherein the nanohardness is also determined to be highest, at about ~18–19 GPa. Furthermore, the ball-on-disk tribometry test on Mo-DLC coating with highest nanohardness shows a low coefficient of friction (COF) of 0.2 with low wear loss compared to that of the substrate (0.62).

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Plasma Oxidation Printing into DLC and Graphite for Surface Functionalization

Cited by 4 publications

References 11 publications

Imprinting of Micro-/Nano-Textures onto Metals and Alloys with Use of the Laser-Printed DLC-Die

Imprinting of Micro-/Nano-Textures onto Metals and Alloys with Use of the Laser-Printed DLC-Die

Heat Transportation by Acicular Micro-Textured Device with Semi-Regular Alignment

Effect of Molybdenum Content on Mechanical and Tribological Properties of Diamond-Like Carbon Coatings over Titanium β-21S Alloy

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