Thermochemical treatment of machinery components for...

Details Thermochemical treatment of machinery components for... Thermochemical treatment of machinery components for...

C - Chemistry, Metallurgy

23

C

148/45

C23C 22/50 (2006.01) B22F 3/24 (2006.01) C23C 8/80 (2006.01)

Patent

CA 2016843

ABSTRACT OF THE DISCLOSURE: Disclosed is a process for manufacturing a corrosion resistant iron-alloy, powered metal or sintered carbide component. In a first step, the component is subjected to an initial thermochemical treatment preferably consisting of nitriding, in a closed furnace in order to form onto the surface of the component a nitrogen diffusion zone followed by the superficial layer consisting of ?' and .epsilon. nitride layers. In a second step, an aqueous solution comprising oxygen, carbon, nitrogen and sulfur is introduced into the furnace for a period of time sufficient to allow transformation of the .epsilon. nitride layer into a porous layer of ferrous oxide(s). This process is particularly efficient and permits to produce a superficial porous ferrous oxide layer thicker than 2 µm onto a nitride steel component.

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