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.

PDF Containerless_processing_of_ceramics_by_aerodynamic_levitation.pdf Restricted to Registered users only Download (1MB) | Request a copy

Abstract

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

Actions (login required)

View Item