In situ X-ray observations of pure-copper layer formation with blue direct diode lasers

Sato, Yuji; Tsukamoto, Masahiro; Shobu, Takahisa; Funada, Yoshinori; Yamashita, Yorihiro; Hara, Takahiro; Sengoku, Masanori; Sakon, Yu; Ohkubo, Takeru; Yoshida, Minoru; Abe, Nobuyuki

doi:10.1016/j.apsusc.2019.03.057

Cited by 45 publications

(9 citation statements)

References 17 publications

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“…( 1), (2), and (3), which were produced by 32 atoms. The PDFs of configuration (1) and the experiments are shown in figure 2. The PDF reproduced the first and second peaks well, and the first bottom peak was obtained experimentally.…”

Section: Resultsmentioning

confidence: 99%

“…for motors and bus bars in battery modules, because of its high electrical conductivity. Welding of copper, which is a highly infrared-lightreflective material, is performed using blue and green lasers, in addition to an infrared laser [1][2][3]. The use of the these visible lasers have dramatically improved the stability and quality of heat-conduction welding of copper.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optical properties of liquid pure copper by density functional theory

Katō

Ono

Sunahara

et al. 2023

J. Phys.: Condens. Matter

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The optical properties of pure liquid copper were investigated using density functional theory with the Quantum ESPRESSO package. The effects of structural changes were investigated by comparing the electron density of states and imaginary part of the dielectric function between the crystalline and liquid states with densities near the melting point.The results indicated that the effect of interband transitions remains in the structural changes near the melting point.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical properties of liquid pure copper by density functional theory

Katō

Ono

Sunahara

et al. 2023

J. Phys.: Condens. Matter

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“…The schematic diagram of the BDL welding used in this investigation is given in Figure 1. More details about the BDL system at JWRI have been provided by Sato et al [13] and Asano et al [14].…”

Section: Welding Proceduresmentioning

confidence: 99%

“…The intention of this newly developed laser technology was for material processing [12]. The BDL technology at JWRI has been successfully used for cladding pure copper on a stainless steel (SS304) substrate [13,14]. Hummel et al [15] conducted a feasibility study by conducting micro-welding of copper using a diode laser with a wavelength of 450 nm (no other detail was provided, but presumably a BDL) and 150 W of power.…”

Section: Introductionmentioning

confidence: 99%

Blue Diode Laser Welding of Commercially Pure Titanium Foils

Pasang

Lin

Misiołek

et al. 2022

QuBS

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The need for thin foil welding is increasing significantly, particularly in the electronic industries. The technologies that are currently available limit the joining processes in terms of materials and their geometries. In this paper, a series of trials of fusion welding (bead-on- plate) of commercially pure titanium (CPTi) foils were conducted using a blue diode laser (BDL) welding method. The power used was 50 W and 100 W for 0.1 mm and 0.2 mm thick foils, respectively. Following welding, various samples were prepared to examine the weld profiles, microstructures, hardness, tensile strength, and fracture surface characteristics. The results showed that the base metal (BM) had an annealed microstructure with equiaxed grains, while the weld zones contained martensite (α’) with large grains. The hardness increased in both regions, from around 123 HV to around 250 HV, in the heat-affected zone (HAZ) and fusion zone (FZ) areas. The tensile tests revealed that the strengths of the welded samples were slightly lower than the unwelded samples, i.e., UTS = 300–350 MPa compared with 325–390 MPa for the unwelded samples. Fracture took place within the BM area. All of the samples, welded and unwelded, showed identical fracture mechanisms, i.e., microvoid coalescence or ductile fracture. The weld zone experienced very small strains (elongation) at fracture, which indicates a good weld quality.

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“…[11,12] It was reported that this method could realize uniform heating of supplied metal powders, resulting in a thin molten layer forming on the substrate. [13][14][15] On the other hand, the fabrication of pure copper layers by LMD is challenging. This is due to the low light absorptivity of pure copper for the infrared (IR) region (about 10%), which is the wavelength widely used for the laser heat source.…”

Section: Introductionmentioning

confidence: 99%

Pure copper layer coating with multibeam laser metal deposition system with blue diode lasers

Fujio,

Yoshida,

Yamamoto

et al. 2024

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIX

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A pure copper layer was produced on a stainless-steel type 304 substrate by using a multi-beam laser metal deposition method with blue diode lasers (B-LMD) to add the antibacterial and virus inactivation effect of pure copper on a highstrength and cost efficient material. To make a copper layer on a substrate by LMD method, beads must be formed continuously at specific intervals and each fabricated bead must be overlapped on the substrate. In this study, to fabricate a high-quality copper layer on a SS304 substrate, the effect of hatching distance (distance between each bead) was investigated. The copper layer was fabricated on the SS304 substrate with a multi-beam B-LMD method at the spot size of 233 µm varying the hatching distance. After the copper coating process, the surface roughness and cross-section of the copper layer were observed. As a result, the surface roughness became high and a large amount of voids were formed inside the layer when the hatching distance was under 150 µm. On the other hand, dilution of copper and SS304 increased as the hatching distance increased.

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In situ X-ray observations of pure-copper layer formation with blue direct diode lasers

Cited by 45 publications

References 17 publications

Optical properties of liquid pure copper by density functional theory

Optical properties of liquid pure copper by density functional theory

Blue Diode Laser Welding of Commercially Pure Titanium Foils

Pure copper layer coating with multibeam laser metal deposition system with blue diode lasers

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