NIOSHTIC-2 Publications Search

Method for locating metallic nitride inclusions in metallic alloy ingots.

Authors
White JC; Traut DE; Oden LL; Schmitt RA
Source
U.S. Pat 5,110,546, 1992 May; :1-5
NIOSHTIC No.
10008501
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.
Keywords
Metal alloys; Metallurgy; Metallurgical processes; Analytical processes
Publication Date
19920101
Document Type
PA; Patent
Fiscal Year
1992
Identifying No.
P 2-92
NIOSH Division
ALRC
Source Name
U.S. Patent 5,110,546
State
OR
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division