A DLC-punch array to fabricate the micro-textured aluminum sheet for boiling heat transfer control

Tatsuhio Aizawa; Kenji Wasa; Hiroshi Tamagaki

doi:10.3390/mi9040147

A DLC-punch array to fabricate the micro-textured aluminum sheet for boiling heat transfer control

Tatsuhio Aizawa, Kenji Wasa, Hiroshi Tamagaki

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

A diamond-like carbon (DLC) film, coated on an SKD11 (alloy tool steel) substrate, was shaped by plasma oxidation to form an assembly of DLC macro-pillars and to be used as a DLC-punch array that is micro-embossed into aluminum sheets. First, the SKD11 steel die substrate was prepared and DLC-coated to have a film thickness of 10 μm. This DLC coating worked as a punch material. The two-dimensional micro-patterns were printed onto this DLC film by maskless lithography. The unprinted DLC films were selectively removed by plasma oxidation to leave the three-dimensional DLC-punch array on the SKD11 substrate. Each DLC punch had a head of 3.5 μm × 3.5 μm and a height of 8 μm. This DLC-punch array was fixed into the cassette die set for amicro-embossing process using a table-top servo-stamper. Furthermore, through numerically controlled micro-embossing, an alignment of rectangular punches was transcribed into a micro-cavity array in the aluminum sheet. The single micro-cavity had a bottom surface of 3.2 μm × 3.2 μm and an average depth of 7.5 μm. A heat-transfer experiment in boiling water was also performed to investigate the effect ofmicro-cavity texture on bubbling behavior and the boiling curve.

Original language	English
Article number	147
Journal	Micromachines
Volume	9
Issue number	4
DOIs	https://doi.org/10.3390/mi9040147
Publication status	Published - 2018 Mar 25

Keywords

Aluminum sheets
Boiling heat transfer
Micro-cavity textures
Micro-embossing
Multi DLC-punch assembly
Plasma oxidation
Plasma printing

ASJC Scopus subject areas

Control and Systems Engineering
Mechanical Engineering
Electrical and Electronic Engineering

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10.3390/mi9040147

Cite this

@article{ef83e10d625d408ea1d7d3cab782f7f5,

title = "A DLC-punch array to fabricate the micro-textured aluminum sheet for boiling heat transfer control",

abstract = "A diamond-like carbon (DLC) film, coated on an SKD11 (alloy tool steel) substrate, was shaped by plasma oxidation to form an assembly of DLC macro-pillars and to be used as a DLC-punch array that is micro-embossed into aluminum sheets. First, the SKD11 steel die substrate was prepared and DLC-coated to have a film thickness of 10 μm. This DLC coating worked as a punch material. The two-dimensional micro-patterns were printed onto this DLC film by maskless lithography. The unprinted DLC films were selectively removed by plasma oxidation to leave the three-dimensional DLC-punch array on the SKD11 substrate. Each DLC punch had a head of 3.5 μm × 3.5 μm and a height of 8 μm. This DLC-punch array was fixed into the cassette die set for amicro-embossing process using a table-top servo-stamper. Furthermore, through numerically controlled micro-embossing, an alignment of rectangular punches was transcribed into a micro-cavity array in the aluminum sheet. The single micro-cavity had a bottom surface of 3.2 μm × 3.2 μm and an average depth of 7.5 μm. A heat-transfer experiment in boiling water was also performed to investigate the effect ofmicro-cavity texture on bubbling behavior and the boiling curve.",

keywords = "Aluminum sheets, Boiling heat transfer, Micro-cavity textures, Micro-embossing, Multi DLC-punch assembly, Plasma oxidation, Plasma printing",

author = "Tatsuhio Aizawa and Kenji Wasa and Hiroshi Tamagaki",

note = "Funding Information: Acknowledgments: The authors would like to express their gratitude to T. Yamada, N. Ono, S. Kurozumi, S. Saitoh (SIT), and K. Akari (Kobelco, Co., Ltd., Takasago, Japan) for their help in experiments. This study is financially supported in part by the Ministry of Education, Culture, Sports, Science and Technology (MEXT)-project in 2017. Publisher Copyright: {\textcopyright} 2018 by the authors.",

year = "2018",

month = mar,

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doi = "10.3390/mi9040147",

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AU - Aizawa, Tatsuhio

AU - Wasa, Kenji

AU - Tamagaki, Hiroshi

N1 - Funding Information: Acknowledgments: The authors would like to express their gratitude to T. Yamada, N. Ono, S. Kurozumi, S. Saitoh (SIT), and K. Akari (Kobelco, Co., Ltd., Takasago, Japan) for their help in experiments. This study is financially supported in part by the Ministry of Education, Culture, Sports, Science and Technology (MEXT)-project in 2017. Publisher Copyright: © 2018 by the authors.

PY - 2018/3/25

Y1 - 2018/3/25

N2 - A diamond-like carbon (DLC) film, coated on an SKD11 (alloy tool steel) substrate, was shaped by plasma oxidation to form an assembly of DLC macro-pillars and to be used as a DLC-punch array that is micro-embossed into aluminum sheets. First, the SKD11 steel die substrate was prepared and DLC-coated to have a film thickness of 10 μm. This DLC coating worked as a punch material. The two-dimensional micro-patterns were printed onto this DLC film by maskless lithography. The unprinted DLC films were selectively removed by plasma oxidation to leave the three-dimensional DLC-punch array on the SKD11 substrate. Each DLC punch had a head of 3.5 μm × 3.5 μm and a height of 8 μm. This DLC-punch array was fixed into the cassette die set for amicro-embossing process using a table-top servo-stamper. Furthermore, through numerically controlled micro-embossing, an alignment of rectangular punches was transcribed into a micro-cavity array in the aluminum sheet. The single micro-cavity had a bottom surface of 3.2 μm × 3.2 μm and an average depth of 7.5 μm. A heat-transfer experiment in boiling water was also performed to investigate the effect ofmicro-cavity texture on bubbling behavior and the boiling curve.

AB - A diamond-like carbon (DLC) film, coated on an SKD11 (alloy tool steel) substrate, was shaped by plasma oxidation to form an assembly of DLC macro-pillars and to be used as a DLC-punch array that is micro-embossed into aluminum sheets. First, the SKD11 steel die substrate was prepared and DLC-coated to have a film thickness of 10 μm. This DLC coating worked as a punch material. The two-dimensional micro-patterns were printed onto this DLC film by maskless lithography. The unprinted DLC films were selectively removed by plasma oxidation to leave the three-dimensional DLC-punch array on the SKD11 substrate. Each DLC punch had a head of 3.5 μm × 3.5 μm and a height of 8 μm. This DLC-punch array was fixed into the cassette die set for amicro-embossing process using a table-top servo-stamper. Furthermore, through numerically controlled micro-embossing, an alignment of rectangular punches was transcribed into a micro-cavity array in the aluminum sheet. The single micro-cavity had a bottom surface of 3.2 μm × 3.2 μm and an average depth of 7.5 μm. A heat-transfer experiment in boiling water was also performed to investigate the effect ofmicro-cavity texture on bubbling behavior and the boiling curve.

KW - Aluminum sheets

KW - Boiling heat transfer

KW - Micro-cavity textures

KW - Micro-embossing

KW - Multi DLC-punch assembly

KW - Plasma oxidation

KW - Plasma printing

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JF - Micromachines

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M1 - 147

ER -

A DLC-punch array to fabricate the micro-textured aluminum sheet for boiling heat transfer control

Abstract

Keywords

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