Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Reexamination Certificate
2007-09-18
2007-09-18
LaVilla, Michael E. (Department: 1775)
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
C427S249180, C427S249700, C427S255394
Reexamination Certificate
active
10755349
ABSTRACT:
The invention relates to the use of PVD technique for the application of a low static friction and wear resistant coating consisting essentially of titanium nitride or a diamond-like carbon—DLC, with or without an addition of tungsten carbide, on a stainless steel, in one and the same operation as the surface hardening of the stainless steel. In this way, in one single operation, a low static friction is obtained on a very hard and wear resistant surface. Moreover, the dimensions of the work-piece are maintained unaltered, which makes the invention very useful in the production of, e.g., cam followers, cylinder tubes and piston rods for shock absorbers. The used stainless steel has the following composition (in weight %): carbon max about 0.1; nitrogen max about 0.1; copper from about 0.5 to about 4; chromium from about 10 to about 14; molybdenum from about 0.5 to about 6; nickel from about 7 to about 11; cobalt 0 to about 9; tantalum max about 0.1; niobium max about 0.1; vanadium max 0.1; tungsten max about 0.1; aluminum from about 0.05 to about 0.6; titanium from about 0.4 to about 1.4; silicon max about 0.7; manganese max about 1.0; iron balance, and normally occurring usual steelmaking additions and impurities.
REFERENCES:
patent: 3988955 (1976-11-01), Engle et al.
patent: 5197783 (1993-03-01), Theimer et al.
patent: H1210 (1993-07-01), Jansen
patent: 5632826 (1997-05-01), Hultin-Stigenberg et al.
patent: 5707748 (1998-01-01), Bergmann
patent: 5830531 (1998-11-01), Bergmann
patent: 6238490 (2001-05-01), Bell et al.
patent: 6475307 (2002-11-01), Nystrom et al.
patent: 2003/0195074 (2003-10-01), Kaga et al.
patent: 2004/0173288 (2004-09-01), Berglund
patent: 2006/0102253 (2006-05-01), Berglund
patent: 2 364 530 (2002-01-01), None
patent: 09-094911 (1997-04-01), None
patent: WO93/07303 (1993-04-01), None
patent: WO95/09930 (1995-04-01), None
patent: WO99/55929 (1999-11-01), None
patent: WO 01/14601 (2001-03-01), None
patent: WO 01/36699 (2001-05-01), None
patent: WO 01/79585 (2001-10-01), None
S. J. Harris et al., “A diamond-like carbon film for wear protection of steel”,Surface and Coatings Technology, 62, (1993) 550-557.
W. König et al., “PVD- and CVD-beschichtete Hartmetalle im Leistungsvergleich”,Proceedings of the 13thInternational Plansee Seminar, Eds. H. Bildstein and R. Eck, Metallwerk Plansee, Reutte(1993), vol. 3, pp. 1-15.
G. Berglund, U.S. Appl. No. 11/755,347, filed Jan. 13, 2004, entitled “Surface Modified Precipitation Hardened Stainless Steel”.
Drinker Biddle & Reath LLP
LaVilla Michael E.
Sandvik Intellectual Property AB
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