OXYGEN SOLUBILITY IN ALUMINUM-CONTAINING Ni –Co –Cr MELTS

Thermodynamic analysis of oxygen solutions in aluminum-containing Ni – Co – Cr melts has been carried out. As the base alloys Ni  –  10  %  Co  –  15  %  Cr, Ni  –  15  %  Co  –  10  %  Cr, Ni  –  20  %  Co  –  15  %  Cr and Ni  –  40  %  Co  –  10  %  Cr were considered. The dependences of the oxygen solubility on the content of aluminum in Ni – Co – Cr melts were calculated at 1873  K. Aluminum at very low levels practically does not effect on the oxygen concentration in the melt, a further increase of the aluminum content leads to a very significant decrease of the oxygen concentration in the melt. Aluminum contents under which the mechanism of the deoxidation reaction changes were determined in investigated melts.

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