The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1996
Filed:
Aug. 23, 1994
Vinod K Pareek, Flemington, NJ (US);
Trikur A Ramanarayanan, Somerset, NJ (US);
James D Mumford, Long Valley, NJ (US);
Adnan Ozekcin, Bethlehem, PA (US);
Exxon Research and Engineering Company, Florham Park, NJ (US);
Abstract
The present invention is a process for forming protective films on an alloy substrate by: oxidizing an alloy comprising iron and chromium in an oxygen containing atmosphere, said alloy containing from about 5 to about 15 wt % chromium, at a temperature of from about 200.degree. C. (473.degree. K.) to about 1400.degree. C. (1673.degree. K.), more preferably 300.degree. C. (573.degree. K.) to 600.degree. C. (873.degree. K.) wherein the partial pressure of oxygen in said oxygen containing atmosphere is above or equal to the dissociation pressure of Fe.sub.3 O.sub.4 and FeO below or equal to the dissociation pressure of Fe.sub.2 O.sub.3 within the specified temperature range, and for a time sufficient to effect the formation of a film comprising iron-chromium oxide (FeCr.sub.2 O.sub.4) spinel on the surface of said alloy. In a further embodiment, the film may additionally contain Silicon.