Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1980-06-05
1981-12-15
Lewis, Michael L.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 05AA, 75 05BA, 75251, 148 635, 148 3155, 148105, 148126, 428570, C22B 512
Patent
active
043057527
ABSTRACT:
In the process for preparing a magnetically stable powder comprising the steps of reducing an iron oxide precursor with a gaseous reduction agent and stabilizing the metallic powder thus produced, the improvement which comprises coating said iron oxide precursor with an antimony compound at a level of up to about 7 weight percent antimony based on the weight of the iron oxide content of the precursor and precipitating tin hydroxides or oxyhydroxides at a level of from about 0.5 to about 8.0 weight percent tin based on the weight of the iron oxide content of the precursor onto the antimony coated iron oxide precursor prior to said reduction.
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Lewis Michael L.
Pfizer Inc.
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