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 journalArticle

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 languageEnglish
Article number147
JournalMicromachines
Volume9
Issue number4
DOIs
Publication statusPublished - 2018 Mar 25

Fingerprint

Aluminum sheet
Boiling liquids
Diamonds
Heat transfer
Carbon
Diamond like carbon films
Substrates
Plasmas
Oxidation
Tool steel
Alloy steel
Lithography
Macros
Film thickness
Textures
Coatings
Steel

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

Cite this

A DLC-punch array to fabricate the micro-textured aluminum sheet for boiling heat transfer control. / Aizawa, Tatsuhio; Wasa, Kenji; Tamagaki, Hiroshi.

In: Micromachines, Vol. 9, No. 4, 147, 25.03.2018.

Research output: Contribution to journalArticle

Aizawa, Tatsuhio ; Wasa, Kenji ; Tamagaki, Hiroshi. / A DLC-punch array to fabricate the micro-textured aluminum sheet for boiling heat transfer control. In: Micromachines. 2018 ; Vol. 9, No. 4.
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