Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Reexamination Certificate
2003-07-15
2008-10-07
Sheehan, John P. (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
C148S220000, C148S230000
Reexamination Certificate
active
07431778
ABSTRACT:
The invention relates to case-hardening of a stainless steel article by means of gas including carbon and/or nitrogen, whereby carbon and/or nitrogen atoms diffuse through the surface into the article. The method includes activating the surface of the article, applying a top layer on the activated surface to prevent repassivation. The top layer includes metal which is catalytic to the decomposition of the gas.
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B. Larisch et al., “Plasma nitriding of stainless steels at low temperatures”, Feb. 17, 2000, Institute of Material Engineering, Gustav-Zeuner-Str.5, 09596.
F. Lowenheim, Electroplating, 1978, McGraw-Hill Book Company, “Nickel Plating”, pp. 211-224.
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V.D. Kuznetsov, “Stabilisation of the Processes of Nitriding and Carburization of High-Chromium Stainless Steels by Preliminary Nickel Plating Thereof”, Issue 112, Trudy Kai, 1969.
Christiansen Thomas
Möller Per
Somers Marcel A. J.
Cooper & Dunham LLP
Danmarks Tekniske Universitet-Dtu
Roe Jessee R.
Sheehan John P.
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