Title:
炭化タングステンおよび炭化クロムを含有する、ピストンリング用の耐磨耗層
Document Type and Number:
Japanese Patent JP2004514795
Kind Code:
A
Abstract:
The invention relates to a wear protection layer for piston rings in internal combustion engines consisting essentially of chromium carbides, wolfram carbide, chromium and nickel. The wear protection layer is formed from a mixture of powders in which the first powder consists of at least the alloy components chromium carbide, chromium and nickel, in the form of an agglomerated and sintered powder, and which has not been subjected to any secondary heat treatment that would make the powder brittle, such as plasma refinement, the carbides in the powder having an average diameter of essentially not more than 3 mum. A second powder, also in the form of an agglomerated and sintered powder, contains wolfram carbide and is applied to at least one peripheral surface of the piston rings by thermal injection, so that two distinctive coating areas are produced in the wear protection layer. A first area, predominantly rich in chromium, and a second area, mainly rich in wolfram carbide are formed.
Inventors:
Harpst-Dederichs, Christian
Application Number:
JP2002550133A
Publication Date:
May 20, 2004
Filing Date:
November 17, 2001
Export Citation:
Assignee:
Federal-Mogul Burscheid Gesellschaft Mitt Beschlenktel Haftung
International Classes:
C23C4/04; C23C4/06; C23C30/00; F16J9/26; F02F5/00; (IPC1-7): C23C4/04; F02F5/00; F16J9/26
Domestic Patent References:
| JPH07258819A | 1995-10-09 | |||
| JPH1150908A | 1999-02-23 | |||
| JPH06117537A | 1994-04-26 | |||
| JPS558497A | 1980-01-22 | |||
| JPS5025921A | 1975-03-18 | |||
| JPH10110252A | 1998-04-28 | |||
| JPH1061767A | 1998-03-06 | |||
| JPH08210504A | 1996-08-20 | |||
| JPH11350102A | 1999-12-21 |
Attorney, Agent or Firm:
Akio Miyazaki
Nobuyuki Kaneda
Katsuhiro Ito
Ishibashi Masayuki
Nobuyuki Kaneda
Katsuhiro Ito
Ishibashi Masayuki