Mechanism of the Unusual Wetting of a Surface Fine Crevice Structure Created by Laser Irradiation

Siboniso, Vilakazi; Yeon, Jejoon; Grozescu, Christian; Goto, Hiroki; Nakamoto, Masashi; Matsumoto, Ryo; Utsunomiya, Hiroshi; Tanaka, Toshihiro

doi:10.2320/matertrans.m2017115

Cited by 8 publications

(6 citation statements)

References 9 publications

(26 reference statements)

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“…5) We posit that super-spread wetting of liquid metal on the surface fine crevice structure derived from capillary action through the three-dimensional connected microcrevice gaps. 4) We consider that the fine surface structure mediates capillary action, that is, wetting behavior; nevertheless, the formation mechanism of the surface fine crevice structures produced by laser irradiation remains poorly understood. To further develop applications of this method, it is necessary to understand the formation mechanism of the fine structure during laser irradiation.…”

Section: Introductionmentioning

confidence: 99%

<i>In Situ</i> Observations of the Formation of Surface Fine Crevice Structures Created by Laser Irradiation

Yeon

Nakamoto

et al. 2021

Mater. Trans.

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We used laser irradiation to create surface fine crevice structures, which induced region-selective super-spread wetting. These crevice structures enabled joining of CuCu. We recently reported that laser irradiation can form surface fine crevice structures, not only on Cu but also on Fe surfaces. However, the formation mechanism of such structures is not yet understood. To clarify this mechanism, we performed in situ observations of Cu and Fe surfaces during laser irradiation, with the use of a high-speed camera and laser illumination. In this way we directly observed swelling and spattering caused by ejection of molten metal from laser-irradiated regions. We conclude that the formation of the surface fine crevice structure was caused by the accumulation of ejected molten metal, that is, entanglement of protuberances and spatter.

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Section: Introductionmentioning

confidence: 99%

<i>In Situ</i> Observations of the Formation of Surface Fine Crevice Structures Created by Laser Irradiation

Yeon

Nakamoto

et al. 2021

Mater. Trans.

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“…It has been reported that super-spread wetting proceeds via gradual wetting of microscopic structure to wetting of macroscopic structure on the surface fine crevice structure produced by laser irradiation. 7) It was supposed that the super-spread wetting of the interface fine mesh structure in this study occurs by a similar mechanism to that of the surface fine crevice structure. The gap size of interface fine mesh structure in Fig.…”

Section: Resultsmentioning

confidence: 62%

Metal–Metal Joining Using Super-Spread Wetting into Interface Fine Mesh Structure

et al. 2018

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Our group has previously realized region-selective super-spread wetting through surface fine crevice structures fabricated by laser irradiation or reduction-sintering of oxide powder and joined metals in microscopic regions by super-spread wetting. A new approach suitable for wide-area joining was investigated in this study. Using a metal mesh with high porosity, we produced a new structure termed "interface fine mesh structure" that can promote super-spread wetting. As well as successful super-spread wetting of liquid tin into a copper interface fine mesh structure, copper blocks were also joined by super-spread wetting.

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“…Our research group [13][14][15] originally found that super-spread wetting occurs on the surface fine porous structure that is produced by atmospheric oxidation-reduction treatment of a metal surface. In further studies, we found two kinds of surface fine crevice structures that can promote region-selective super-spread wetting of liquid metals: namely, (1) a laser-irradiated surface fine crevice structure, created by laser irradiation [16][17][18][19][20] and (2) a powder-based surface fine crevice structure, created by reduction sintering of an oxide powder [21] on copper and iron surfaces. Super-spread wetting of these two surface fine crevice structures showed that similar and dissimilar metal-to-metal joining, such as Cu-Cu [16,17,21] and Cu-Fe [20] joining, can be achieved.…”

Section: Introductionmentioning

confidence: 97%

“…Our research group discovered a phenomenon known as "super-spread wetting", in which a liquid metal penetrates into the fine surface structure of a solid metal that has high porosity, similar to that of a sponge structure, by capillary action, and completely spreads on that surface [13][14][15][16][17][18][19][20][21]. Our research group [13][14][15] originally found that super-spread wetting occurs on the surface fine porous structure that is produced by atmospheric oxidation-reduction treatment of a metal surface.…”

Section: Introductionmentioning

confidence: 99%

Joining of Metal to Ceramic Plate Using Super-Spread Wetting

Yeon

Yamamoto

et al. 2020

Metals

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Ceramic-metal composites with novel performance are desirable materials; however, differences in their properties result in difficulties in joining. In this study, the joining of metal to ceramic is investigated. We recently succeeded in causing super-spread wetting on the surface fine crevice structures of metal surfaces produced by both laser irradiation and reduction-sintering of oxide powders. In this work, joining copper onto an Al2O3 plate was achieved by taking advantage of super-spread wetting. Fe2O3 powder was first sintered under reducing conditions to produce a microstructure which can cause super-spread wetting of liquid metal on an Al2O3 plate. A powder-based surface fine crevice structure of metallic iron with high porosity was well-formed due to the bonding of the reduced metallic iron particles. This structure was joined on an Al2O3 plate with no cracking by the formation of an FeAl2O4 layer buffering the mismatch gap between the thermal expansion coefficients of iron and Al2O3. We successfully achieved metalizing of the Al2O3 surface with copper without interfacial cracks using super-spread wetting of liquid copper through the sintered metallic iron layer on the Al2O3 plate. Then, laser irradiation was conducted on the surface of the copper-metalized Al2O3 plate. A laser-irradiated surface fine crevice structure was successfully created on the copper-metalized Al2O3 plate. Moreover, it was confirmed that the super-spread wetting of liquid tin occurred on the laser-irradiated surface fine crevice structure, finally accomplishing the joining of a copper block and the copper-metalized Al2O3.

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Mechanism of the Unusual Wetting of a Surface Fine Crevice Structure Created by Laser Irradiation

Cited by 8 publications

References 9 publications

<i>In Situ</i> Observations of the Formation of Surface Fine Crevice Structures Created by Laser Irradiation

<i>In Situ</i> Observations of the Formation of Surface Fine Crevice Structures Created by Laser Irradiation

Metal–Metal Joining Using Super-Spread Wetting into Interface Fine Mesh Structure

Joining of Metal to Ceramic Plate Using Super-Spread Wetting

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