Alloys or metallic compositions – Processes
Patent
1991-05-07
1992-05-05
Rosenberg, Peter D.
Alloys or metallic compositions
Processes
C22C 100
Patent
active
051105462
ABSTRACT:
A method of determining the location and history of metallic nitride and/or oxynitride inclusions in metallic melts. The method includes the steps of labeling metallic nitride and/or oxynitride inclusions by making a coreduced metallic-hafnium sponge from a mixture of hafnium chloride and the chloride of a metal, reducing the mixed chlorides with magnesium, nitriding the hafnium-labeled metallic-hafnium sponge, and seeding the sponge to be melted with hafnium-labeled nitride inclusions. The ingots are neutron activated and the hafnium is located by radiometric means. Hafnium possesses exactly the proper metallurgical and radiochemical properties for this use.
REFERENCES:
patent: 3241919 (1966-03-01), O'Connor
patent: 3622309 (1968-10-01), Hill
Oden Laurance L.
Schmitt Roman A.
Traut Davis E.
White Jack C.
Koltos E. Philip
Rosenberg Peter D.
The United States of America as represented by the Secretary of
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