DETERMINATION OF OXYGEN IN IRON-ALUMINUM ALLOY BY INERT-GAS FUSION-INFRARED ABSORPTIOMETRY (REPRINTED FROM J JAPAN INST METALS, VOL 55, PG 975, 1991)

The method for the determination of oxygen in iron containing aluminum was studied by use of the inert gas fusion-infrared absorptiometry as a function of flux, temperature and heating pattern. The double graphite crucibles containing Sn in excess of four times as much as the sample weight were first degassed at 3000 K, and the temperature was lowered to 2630 approximately 2760 K. Then the sample enclosed by nickel capsule was dropped into the tin bath and fused for 30 s. This analytical procedure made the oxygen determination in an Fe-10 approximately 15 mass%Al alloy possible without observation of "gettering effect" due to aluminum. The value for oxygen recovery was confirmed to be almost 100% by the analysis of alumina powder. The results for the oxygen in a Ti-25 approximately 51 mass%Al alloy was also discussed.