Alloys or metallic compositions – Ferrous – Processes
Patent
1991-07-12
1993-04-06
Sheehan, John P.
Alloys or metallic compositions
Ferrous
Processes
420 77, 420 78, 420103, 420117, 148113, C22C 3300
Patent
active
052001458
ABSTRACT:
The present invention relates to a novel process for producing silicon and/or aluminum containing iron alloy product as well as the material produced from same in either sheet or bulk structure form for electromagnetic circuit application. The process entails modifying an iron feedstock containing less than about 2.5 wt % silicon, aluminum or a combination thereof. The process further consists of diffusion of silicon or silicon and aluminum or aluminum into an iron feedstock by a pack diffusion or a chemical vapor deposition method in which the iron feedstock is heated to a temperature at which diffusion occurs in the presence of a pack containing silicon and/or aluminum sources, a reducing agent, a catalyst, and a filler, or in the presence of a flowing gas stream containing a volatile silicon compound. The resulting iron alloy product, which has a silicon content in the range of 0.25%--7% silicon, and an aluminum content in the range of about 0%--4% aluminum, has favorable properties for motor and transformer applications.
REFERENCES:
patent: 2140889 (1938-12-01), Vogt
patent: 3756867 (1973-09-01), Brissonneau et al.
patent: 4177092 (1979-12-01), Thursby
patent: 4904500 (1990-02-01), Krutenat
Metals Handbook, 9th ed., vol. 5, p. 340, American Society for Metals.
Barnard Robert S.
Dismukes John P.
Kear Bernard H.
Krutenat Richard C.
Witzke Horst
Exxon Research and Engineering Co.
Scuorzo Linda M.
Sheehan John P.
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