Stock material or miscellaneous articles – All metal or with adjacent metals – Laterally noncoextensive components
Reexamination Certificate
2006-02-21
2006-02-21
Zimmerman, John J. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Laterally noncoextensive components
C428S570000, C428S665000, C428S666000, C428S698000, C427S450000, C427S455000, C092S233000
Reexamination Certificate
active
07001670
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 μm. 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.
REFERENCES:
patent: 3606359 (1971-09-01), McCormick
patent: 3814447 (1974-06-01), Prasse et al.
patent: 3837817 (1974-09-01), Nakamura
patent: 4218494 (1980-08-01), Belmondo et al.
patent: 4925626 (1990-05-01), Anand et al.
patent: 5395221 (1995-03-01), Tucker et al.
patent: 5419976 (1995-05-01), Dulin
patent: 5713129 (1998-02-01), Rastegar et al.
patent: 5938403 (1999-08-01), Okada et al.
patent: 6482534 (2002-11-01), Itsukaichi et al.
patent: 6562480 (2003-05-01), Stong et al.
patent: 6641917 (2003-11-01), Itsukaichi et al.
patent: 6655181 (2003-12-01), Morales
patent: 6887585 (2005-05-01), Herbst-Dederichs
patent: 0512805 (1992-05-01), None
patent: 0657237 (1993-12-01), None
patent: 0960954 (1999-12-01), None
patent: 867455 (1961-05-01), None
Federal-Mogul Burscheid GmbH
Howard & Howard
Savage Jason
Zimmerman John J.
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