Thermochemical treatment of machinery components for improved co

Details Thermochemical treatment of machinery components for improved co Thermochemical treatment of machinery components for improved co

1991-05-08

1993-07-20

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148220, C23C 822

Patent

active

052289290

ABSTRACT:
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 .gamma.' 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 .mu.m onto a nitride steel component.

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Patent Abstracts of Japan, vol. 7, No. 269 (M-14)(269) Nov. 30, 1983 JP-58-146 762 Sep. 1, 1983 Abstract.

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