Abstract
Molten nitrates in the system (1 − x)NaNO3−xBa(NO3)2 were solidified in the presence of a power ultrasound of 20 kHz. Their microstructures were compared with those of controlled samples which were solidified normally. Grain size in the controlled sample of monolithic NaNO3 (x = 0) was reduced by sonication. In the hypo- (x = 8 wt. %) and the hypereutectic (x = 28 wt. %) binary samples, the sonication completely eliminated the dendritic structure of the primary crystals and induced equiaxed particles of the primary phase. At eutectic (x = 18 wt. %), the sonication removed oriented structures of the eutectic lamellae. Several mechanisms of the microstructural modification were mentioned.
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References
T. Asokan, J. Mater. Sci. Lett. 13, 343–345 (1994).
G. Schmid and L. Ehret, Z. Elektrochem. 43, 869 (1937) (in German).
A. E. Crawford, Metallurgia, March, 109–113 (1953).
E. A. Hiedemann, J. Acoust. Soc. Am. 26 5, 831–842 (1954).
G. I. Eskin, Ultrasonics Sonochemistry 2 (2), S137–141 (1995).
Y. Hori and I. Uezawa, J. Met. Soc. Jpn. 23 (3), 168–172 (1959) (in Japanese).
Y. Tomomasa, N. Enomoto, Y. Ohya, and Z. Nakagawa, in Powder Preparation/Rapid Quenching, edited by K. Akashi, Y. Ozaki, T. Takeda, A. Inoue, T. Masumoto, and T. Suzuki (Mater. Res. Soc. Symp. Int. Proc. 3, Pittsburgh, PA, 1989), pp. 107–114.
N. Enomoto, T-H. Sung. Z. Nakagawa, and S-C. Lee, J. Mater. Sci. 27, 5239–5243 (1992).
N. Enomoto, M. Katsumoto, and Z. Nakagawa, J. Ceram. Soc. Jpn. 102 12, 1105–1111 (1994).
N. Enomoto, T. Koyano, and Z. Nakagawa, Ultrasonics Sono-chemistry 3 2, 105–109 (1996).
B. Chalmers, Principles of Solidification (John Wiley & Sons, Inc., New York, 1964).
R. N. Grugel, F. Hua, and T. G. Wang, J. Mater. Sci. Lett. 13, 1419–1421 (1994).
A. N. Winchell and H. Winchell, Characters of Artificial Inorganic Solid Substances (Academic Press, New York, 1964), p. 101.
Encyclopaedia Chimica (Kyoritsu Shuppan, Tokyo, Japan, 1964).
Handbook of Chemistry, 3rd ed. (Chem. Soc. Jpn., Maruzen, Tokyo, Japan, 1984).
M. A. Dibirov, M. M. Bochkov, L. N. Levina, and A. G. Mozagovoi, Inorg. Mater. 28 5, 708–710 (1992).
N. E. Richards, E. J. Brauner, and J. O’M. Bockris, Brit. J. Appl. Phys. 6, 387–390 (1955).
T. J. Mason, J. P. Lorimer, and D. M. Bates, Ultrasonics 30 1, 40–42 (1992).
J. R. Frederick, Ultrasonic Engineering (John Wiley & Sons, Inc., New York, 1965), p. 116.
J. Campbell, Int. Met. Rev. 1981 2, 71–108 (1981).
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Enomoto, N., Iimura, Y. & Nakagawa, Ze. Microstructure of nitrate polycrystals solidified under ultrasonic vibration. Journal of Materials Research 12, 371–376 (1997). https://doi.org/10.1557/JMR.1997.0053
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DOI: https://doi.org/10.1557/JMR.1997.0053