Micro-/Nano-Texturing of Aluminum by Precise Coining for Functional Surface Decoration

Aizawa, Tatsuhiko; Yoshino, Tomoaki; Inohara, Tadahiko

doi:10.3390/met10081044

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…In recent, the femtosecond laser micro-/nano-texturing method was highlighted not only to make surface property modification of metallic and alloyed parts [5][6][7][8] but also to fabricate the mother die to imprint various textures onto the metallic and polymer products [9][10][11]. In particular, the nanotextures by Laser-Induced Periodic Surface Structuring (LIPSS) were formed onto the hardened die and the DLC-coating die together with the microtextures.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…This plasma-oxidation-assisted technique is exchanged with other approaches. As demonstrated in [40][41][42][43], the nitrogen supersaturated stainless steels as well as this DLC coating are also utilized to make micro-/nano-texturing via the pico-/femtosecond laser micromachining. The LIPSS (laser-induced periodical surface structured) nano-textures are precisely imprinted to metal plates and sheets by CNC-stamping.…”

Section: Discussionmentioning

confidence: 99%

Boiling Heat Transfer on the Micro-Textured Interfaces

Aizawa¹,

Nakata²

2023

Heat Transfer - Fundamentals, Enhancement and Applications

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Higher heat flux than its normal criticality from high-power transistors, LIDAR (Laser Imaging Detection and Ranging), stacked CPUs, high-power transistors, and lasers must be efficiently transferred to cooling media through the metallic interface. The micro-/nano-textured aluminum and copper devices were highlighted among several approaches and fabricated to enhance the boiling heat transfer process to the subcooled water. The plasma printing was proposed to fabricate a pure aluminum device with concave micro-textures and to describe the boiling heat transfer behavior with comparison to the bare aluminum plate. A copper device was wet-plated to have convex micro-textures and to discuss the effect of micro-textures on the heat transfer characteristics under the forced water cooling by varying the Reynolds number. The boiling curve on the micro-textured interfaces was newly constructed by improving the boiling heat transfer process by micro-/nano-texturing.

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“…A precise forging with the use of plasma-printed punch is effective to control the micro-/nanotexture pattern and its unit-cell size on the titanium and titanium alloy tools. In addition, fine nanotextures can be imprinted onto the metallic part and tool surfaces by using the laser-printed SKD11 punch and die, as reported in [ 27 ]. Different from the nanostructured titanium oxides in [ 26 ], the micro-/nanotextured titanium and titanium alloy parts and tools are available by utilizing the present approach.…”

Section: Discussionmentioning

confidence: 99%

Free-Forging of Pure Titanium with High Reduction of Thickness by Plasma-Carburized SKD11 Dies

et al. 2021

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A tool steel type SKD11 punch was plasma carburized at 673 K for 14.4 ks at 70 Pa to make carbon supersaturation. This carburized SKD11 punch was employed for upsetting the pure titanium wire with the diameter of 1.00 mm up to the reduction of thickness by 70% in a single shot. Its contact interface to titanium work was analyzed to describe the anti-galling behavior in this forging. Little trace of titanium proved that the galling process was suppressed by the in situ solid lubrication. The isolated free carbon agglomerates are wrought as a solid lubricant to sustain the galling-free forging process. This anti-galling upsetting reduced the residual strains in the forged wires. A long titanium wire with a length of 45 mm was incrementally upset to yield the titanium ribbon with a thickness of 0.3 mm, the width of 2.3 mm, and the length of 50 mm. The grain size of original pure titanium was much reduced to 2 μm on average. A micro-pillared microtexture was imprinted onto this forged titanium ribbon.

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Micro-/Nano-Texturing of Aluminum by Precise Coining for Functional Surface Decoration

Cited by 8 publications

References 20 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

Boiling Heat Transfer on the Micro-Textured Interfaces

Free-Forging of Pure Titanium with High Reduction of Thickness by Plasma-Carburized SKD11 Dies

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