Abstract
Attempts have been made to evaluate the thermal stability of rare earth oxide face coats against liquid titanium. Determination of microhardness profiles and concentration profiles of oxygen and metallic constituents of oxide in investment cast titanium rods has allowed grActation of relative stability of rare earth oxides. The relative stability of evaluated oxides in the order of increasing stability follows the sequence CeO2 — ZrO2 — Gd2O3 — didymium oxide — Sm2O3 —Nd2O3 — Y2O3. The grading does not follow the free energy data of the formation of these oxides. A better correlation with the experimental observations is obtained when the solubility of the metallic species in titanium is also taken into consideration.
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Saha, R.L., Nandy, T.K., Misra, R.D.K. et al. On the evaluation of stability of rare earth oxides as face coats for investment casting of titanium. Metall Trans B 21, 559–566 (1990). https://doi.org/10.1007/BF02667869
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DOI: https://doi.org/10.1007/BF02667869