Method for producing and oxide layer on metallic elements

Details Method for producing and oxide layer on metallic elements Method for producing and oxide layer on metallic elements

2006-10-03

2006-10-03

King, Roy (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

C148S217000

Reexamination Certificate

active

07115174

ABSTRACT:
In a known method for producing an oxide layer on metal parts, the metal parts are heat-treated in a treatment chamber during a carburization phase at temperatures below 1100° C. [2012° F.] in an atmosphere containing carbon monoxide and hydrogen and then, during an oxidation phase, they are oxidized at an oxidation temperature in the range from 750° C. to 950° C. [1382° F. to 1742° F.] in an atmosphere where a PH2O-to-PH2ratio between 0.3 and 10 has been established by feeding an oxidant into the treatment chamber, a process in which an oxide layer is formed, whereby the oxygen partial pressure is determined by means of an oxygen probe and regulated at least during the oxidation phase. In order to improve the known method in terms of the reproducibility of the formation of corrosion-resistant coatings that cover and adhere well on metal parts containing iron and so as to improve the cost effectiveness of the process, it is proposed according to the invention that the oxygen partial pressure be regulated in such a way that the oxygen probe indicates a probe voltage in the range from 890 mV to 940 mV.

REFERENCES:
patent: 6383297 (2002-05-01), Schmidt
patent: WO 99/10556 (1999-03-01), None

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