Abstract
The method of instant EMF fixation was used to determine the oxygen activity in model Ni melts containing up to 0.001-0.20 wt.% La and Ce. It was shown that at PAr = 0.1 MPa and 1560°C, the oxygen activity when cerium is introduced into the melt is 4.7 times lower than when it deoxidized with lanthanum. SEM investigation shows that the composition of nonmetallic inclusions in molten Ni deoxidized by La and Ce indicates a stronger bond of Ce with oxygen than La and a stronger bond of La with sulfur than Ce.
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