Abstract
The contact surface of oxyfluorochloride melts containing 20–40 wt % BaO with Al2O3, MgO, or MgO · Al2O3 ceramics is studied by laser emission microspectral analysis in the course of melting of complexly alloyed nickel alloys in vacuo. The distribution profiles of barium in a crucible material are determined at different chemical compositions of a slag and ceramics to a depth of 800 μm. The diffusion coefficient of barium D Ba is calculated and ranges from 0.45 × 10−5 to 5.8 × 10−5 cm2/s. A tendency for increasing D Ba in experiments with the Al2O3 ceramics and an insignificant decrease of D Ba in experiments with ceramics of another composition is observed with an increase in the weight fraction of BaO (to 40 wt %).
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