Case-hardening of stainless steel

Details Case-hardening of stainless steel Case-hardening of stainless steel

C - Chemistry, Metallurgy

23

C

C23C 8/26 (2006.01) C23C 8/22 (2006.01) C23C 8/32 (2006.01) C25D 3/12 (2006.01)

Patent

CA 2492506

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.

L'invention concerne la cémentation d'un article en acier inoxydable au moyen de gaz comprenant du carbone et/ou de l'azote, les atomes de carbone et/ou d'azote diffusant dans ledit article à travers la surface. Le procédé consiste à activer la surface de l'article, une couche supérieure étant appliquée sur la surface activée afin d'empêcher une repassivation. La couche supérieure comporte un métal qui est catalytique pour la décomposition des gaz.

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