DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT All percentages herein are by weight of the final composition, unless otherwise indicated.
This is one of four applications all filed on the same day.
All of the applications deal with related inventions.
They are commonly owned and have the same inventor.
The claims, drawings and description in each application are unique, but incorporate the others by reference.
Accordingly, the following three applications are hereby expressly incorporated by reference: "Oxidation Resistant Iron Base Alloy Compositions"; "Non-Iron Base Alloy Compositions"; and "Method of Preparing Non-Iron Base Alloy Compositions.
" These are now, respectively, U.
S.
Ser.
No.
938,179; U.
S.
Ser.
No.
938,182; and U.
S.
Ser.
No.
938,181.
The methods of the present invention relate to the discovery that certain elements can be added to iron-base alloy materials to dramatically improve their resistance to oxidation.
More particularly, the invention relates to the discovery that the addition of these elements (referred to herein as "dopants") yields materials suitable for use in heretofore impractical environments thereby avoiding the use of expensive higher alloy-content materials.
The methods of the present invention comprise preparing an iron-base alloy composition exhibiting improved resistance to oxidation comprising the steps of: (a) admixing in a molten state (i) an iron-containing charge; (ii) at least one alloy element selected from the group consisting of nickel, chromium, molybdenum, manganese, silicon, carbon, vanadium, cobalt, copper, nitrogen, aluminum, titanium, zirconium, and mixtures thereof; and (iii) an effective amount of a dopant selected from the group consisting of lithium, sodium, potassium, yttrium, lanthanum, cerium, calcium, magnesium, barium, aluminum, and mixtures thereof; and (b) allow the admixture to cool.
Accordingly, in a preferred embodiment, the methods of the present invention relate to preparing an iron-base alloy composition exhibiting improved resistance to oxidation comprising the steps of: (a) admixing in a molten state (i) iron; (ii) at least one alloy element selected from the group consisting of silicon, nickel, chromium, manganese, cobalt, nitrogen, and mixtures thereof; and (iii) an effective amount of a dopant selected from the group consisting of lithium, sodium, potassium, yttrium, lanthanum, cerium, calcium, magnesium, barium, aluminum, and mixtures thereof; and (b) allowing the admixture to cool
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