C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/6
C22C 1/10 (2006.01) B01J 23/74 (2006.01) B01J 23/86 (2006.01) C22C 19/07 (2006.01) C22C 38/06 (2006.01) H01F 1/06 (2006.01)
Patent
CA 1140779
ABSTRACT OF THE DISCLOSURE A process, and the compositions produced thereby, wherein an element characterized as aluminum, silicon or chromium, notably aluminum, is alloyed in relatively small concentrations with iron, cobalt or nickel, notably iron or cobalt, or both, which have relatively high Curie temperatures. Small amounts of yttri- um, hafnium, zirconium or lanthanum can also be added. Alloys of specified composition are formed into particles of selected size, and the particles then contacted in an atmosphere of con- trolled oxygen activity at elevated temperature over selected time periods to form an impervious oxide film of critical thick- ness. The compositions may be used as such or as inclusions for the preparation of catalytic or non-catalytic magnetizable solids composites for use in magnetically stabilized fluidized beds for high temperature reactions such as hydro-forming processes or in use as fluid bed fly-ash filters.
333558
Krutenat Richard C.
Liu Chih-An
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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