Nano-lamination in amorphous carbon for tailored coating in micro-dry stamping of AISI-304 stainless steel sheets

Tatsuhiko Aizawa, Eiji Iwamura, Kuniyoshi Itoh

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Nano-lamination is a new way to make full use of multi-layered structure for coating instead of the mono-layered coating system. Different from the conventional nano-lamination approach, where two different kinds of material system are deposited in layers, the amorphous carbon layer, a-C:H, is alternatively deposited with graphite-like cluster layer, resulting in an amorphous carbon base nano-laminated coating. In this nano-lamination, the pulse bias voltage and the pulse duration time are programmed to control the bi-layer thickness and number of laminates. Furthermore, the mechanical properties are also controllable by varying the bi-layer thickness and sub-layer ratio. In this paper, the effect of number of layers and bi-layer thickness on the mechanical properties is investigated by the nano-indentation technique. Higher hardness and Young's modulus is attained with reduction of bi-layer thickness. The scratching test of this nano-laminated coating is made to demonstrate that it has sufficient scratch load above 100 N. Furthermore, a dry micro stamping test is performed to prove that this nano-laminated coating has sufficient wear-toughness enough to make dry stamping in 10,000 times in practice even if it has nearly the same Young's modulus and hardness as the mono-layered coating. No delamination or break-away occurs on the ironed surface of coated tools while severe delamination is observed in the conventional mono-layered coating.

Original languageEnglish
Pages (from-to)794-798
Number of pages5
JournalSurface and Coatings Technology
Volume203
Issue number5-7
DOIs
Publication statusPublished - 2008 Dec 25
Externally publishedYes

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stamping
Stamping
Stainless Steel
Amorphous carbon
Steel sheet
laminates
stainless steels
Stainless steel
coatings
Coatings
carbon
Delamination
Elastic moduli
Hardness
modulus of elasticity
Mechanical properties
hardness
Graphite
mechanical properties
Nanoindentation

Keywords

  • AISI-304 stainless steel sheets
  • Amorphous carbon
  • Mechanical properties
  • Micro-dry stamping
  • Nanolamination
  • WC tool

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Nano-lamination in amorphous carbon for tailored coating in micro-dry stamping of AISI-304 stainless steel sheets. / Aizawa, Tatsuhiko; Iwamura, Eiji; Itoh, Kuniyoshi.

In: Surface and Coatings Technology, Vol. 203, No. 5-7, 25.12.2008, p. 794-798.

Research output: Contribution to journalArticle

Aizawa, Tatsuhiko ; Iwamura, Eiji ; Itoh, Kuniyoshi. / Nano-lamination in amorphous carbon for tailored coating in micro-dry stamping of AISI-304 stainless steel sheets. In: Surface and Coatings Technology. 2008 ; Vol. 203, No. 5-7. pp. 794-798.
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