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Containerless processing of ceramics by aerodynamic levitation

Gandhi, AS and Saravanan, A and Jayaram, V (1996) Containerless processing of ceramics by aerodynamic levitation. In: Materials Science & Engineering A, 221 (1-2). pp. 68-75.

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An inexpensive containerless processing technique based on aerodynamic levitation has been developed for high temperature studies on ceramics. A spherical sample of about 0.5 cm diameter levitates in an upward stream of inert gas in a flared graphite nozzle which also acts as a susceptor and heat's the sample by radiation to a maximum temperature of 2200°C. The highest heating and cooling rates are 8 and $200^oC s^{-1}$, respectively. Solidification studies in this apparatus on the system $Al_20_3-BaO$ suggest that the eutectic between barium hexaaluminate phase-I and $BaAl_20_4$ occurs at less than 28.7 mol% BaO instead of the currently accepted value of 32 mol%. Results of levitation experiments on $Al_2O_3-SiC_p$ composite powder compacts demonstrate the feasibility of using this technique for sintering experiments on refractory ceramics.

Item Type: Journal Article
Publication: Materials Science & Engineering A
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Aerodynamic levitation;Ceramics;Supercooling
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 14 Dec 2006
Last Modified: 19 Sep 2010 04:33
URI: http://eprints.iisc.ac.in/id/eprint/9134

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