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| SOLUBILITIES OF CeO_2, HfO_2 AND Y_2O_3 IN FUSED Na_2SO_4—30m/0 NaVO_3 |
| Zhang Yunshu(Shanghai Institute of Metallurgy; Academia Sinica) Robert A. Rapp(The Ohio State University; U.S.A) |
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Abstract The solubiliities of the potential thermal barrier oxide components CeO_2, HfO_2 HfO_2 and Y_2O_3 were measured as a function of solvent basicity for fused Na_2SO_4-30m/0 NaVO_3 at 900℃ and Ⅰ atm O_2, The solubility of Y_2O_3 was higher than those for CeO_2 or HfO_2. For comparison, the solubility of CeO_2 was measured in pure Na_2SO_4. In the mixed sulfate-metavanadate melts, the oxides formed orthovanadate acidic solutes with a solubility much higher than the corresponding acidic sulfates for the pure Na_2SO_4 melt. The results point to a revised mechanism for hot corrosion of alloys by acidic fluxing.
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Received: 25 June 1987
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[1] Jones, K. L.; Norman, D. B.; Gadomski, S. T. Met. Trans.; 16A, 303(1985)
[2] Nagelberg, A. S., J. Electrochem. Soc., 132, 2502(1985)
[3] Hamilton, J. C.; Nagelberg, A. S.. J. Amer. Cer. Soc., 67, 686(1984)
[4] Jones, R. L.; Jones. S. R.; Williams, C. E.; J. Electrochem. Sot.; 132, 1499(1985)
[5] Jones, B. L.; Williams, C. E.; Jones, S. R., ibid.. 133． 227(1986)
[6] Gupta, D. K.; Rapp, R. A.. ibid., 127, 2194, 2656(1980)
[7] Dcanbardt, M. L.; Stern. K. H., ibid., 128, 2577(1981)
[8] Zhang, Y. S.; Rapp, R.A., ibid., 132, 734, 2498(1985)
[9] Jose, P. D.; Gupta, D. K.; Rapp, R. A, ibid, 132, 735(1985)
[10] Zhang, Y. S.. ibid, 133, 655(1986)
[11] Deanhardt, M. L.; Stern, K. H., ibid., 129, 2228(1982)
[12] Shibata. S., Anal. Chim. Acta. 28． 388(1963)
[13] Goebel, J. A.; Pettit, F. S.; Goward. G. W.. Met. Trans., 4, 261(1973) |
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