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Segregation of Si to the surface of Fe-29Ni-17Co alloy

Nelson, G.C.

The segregation of Si impurities from the bulk to the surface of a low Cr Lot of Kovar{sup TM} (Fe-29Ni-17Co) has been investigated in order to determine the effects on the quality of the braze of Cu to these altered surfaces. It is found that oxides of Si are formed on the surface during wet hydrogen firing. Kinetics of this segregation process have been measured.