Title:
PISTON RING
Document Type and Number:
WIPO Patent Application WO/2015/186790
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a laminated hard-film-coated piston ring which can be used in an environment in which an engine is subjected to high mechanical and thermal loads, and which has superior scuffing resistance, abrasion resistance, and resistance to coating film separation. Therefore, a hard film is deposited on the outer circumferential surface of a piston ring, said hard film containing at least one layer which is a metal layer comprising at least one type of a metal (M) in a CrN/TiN laminated film formed by alternately laminating a CrN-type chromium nitride and a TiN-type titanium nitride. In this case, the metal (M) is selected such that the standard free energy of formation (ΔGM-N) of the nitride of the metal (M) and the standard free energy of formation (ΔGCrN) of the chromium nitride satisfy the relationship ΔGM-N > ΔGCrN.
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Inventors:
SATO MASAYUKI (JP)
MURAYAMA YUUICHI (JP)
SEKIYA TAKUMA (JP)
MURAYAMA YUUICHI (JP)
SEKIYA TAKUMA (JP)
Application Number:
PCT/JP2015/066201
Publication Date:
December 10, 2015
Filing Date:
June 04, 2015
Export Citation:
Assignee:
RIKEN KK (JP)
International Classes:
F16J9/26; C23C14/06; C23C14/14; F02F5/00
Foreign References:
| JP2013155420A | 2013-08-15 | |||
| JPH0474584B2 | 1992-11-26 | |||
| JPS62283258A | 1987-12-09 |
Attorney, Agent or Firm:
TAKAISHI Kitsuma (JP)
Kitsuma Takaishi (JP)
Kitsuma Takaishi (JP)
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