COMPOSITE CHROMIUM PLATING FILM, AND SLIDING MEMBER EQUIPPED WITH THE FILM

Title:

COMPOSITE CHROMIUM PLATING FILM, AND SLIDING MEMBER EQUIPPED WITH THE FILM

Document Type and Number:

WIPO Patent Application WO/2012/091047

Kind Code:

A1

Abstract:

[Problem] To provide a piston ring product in which hard particles can be uniformly filled into cracks occurring on a hard chromium plate that is applied on a sliding surface and which has excellent long-term stability. [Solution] Provided is a composite chromium plating film, in which a hard chromium plating film has a crack-like groove formed thereon and hard particles are filled into the groove, and which is characterized in that the hard particles to be used are irregular particles having the following powder characteristic properties: an average circularity degree of 0.70-0.85; an average equivalent circle diameter of 6.0 μm or less; and an aspect ratio of 1.3 or more. The composite chromium plating film is applicable onto a sliding surface of a piston ring product.

Inventors:

OKAZAKI TAKAHIRO (JP)
TAMEGAI ETSUO (JP)
KAMIYAMA HIDEAKI (JP)
OGAWA KATSUAKI (JP)

Application Number:

PCT/JP2011/080288

Publication Date:

July 05, 2012

Filing Date:

December 27, 2011

Export Citation:

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Assignee:

NIPPON PISTON RING CO LTD (JP)
OKAZAKI TAKAHIRO (JP)
TAMEGAI ETSUO (JP)
KAMIYAMA HIDEAKI (JP)
OGAWA KATSUAKI (JP)

International Classes:

C25D15/02; C25D5/14; F02F5/00; F16J9/26

Domestic Patent References:

WO2005073437A1

2005-08-11

Foreign References:

JPH10130891A	1998-05-19
JPH10130892A	1998-05-19
JP2602499B2	1997-04-23
JPH10130892A	1998-05-19

Other References: