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Microwave sintering studies of $ZrO_2-CeO_2$ ceramics

Ramesh, PD and Sarin, Pankaj and Jeevan, Siddharth and Rao, KJ (1996) Microwave sintering studies of $ZrO_2-CeO_2$ ceramics. In: Journal of Materials Synthesis and Processing, 4 (3). pp. 163-173.

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Abstract

Complete sintering of $ZrO_2-CeO_2$ pellets of compositions varying from pure $ZrO_2$ to pure $CeO_2$ has been achieved within 35 min using a cooking microwave oven of 980-W power and operating at 2.45 GHz. Densification of 95% and above was achieved in most cases. The laboratory temperature phase boundaries have been established, which indicate a slight departure of the compositional limits of phase stability compared to those obtained from conventional sintering. The observations also confirm that the formation of composition-dependent phases is a function of the sintering time. Formation of metastable phase $Ce_2Zr_3O_{10}$ (φ phase) was not observed. Also, cubic phases were generally oxygen deficient and hence no $t'-(Ce,Zr)O_2$ resulting from diffusionless $C_{ss} -> T_{ss}$ transformation at high ceria compositions was found to form. The Vickers hardness value was maximum for mixed $t-(Ce,Zr)O_2 + c-(Ce,Zr)O_2$ system and minimum for cubic solid solution. The apparent toughness values was maximum for the $t-(Ce,Zr)O_2$ phase and the value was minimum for the pure cubic system. Microwave sintering seems to be superior to the conventional sintering process.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Plenum.
Keywords: ceramics;cerium compounds;densification;fracture toughness; hardness;sintering;solid solubility;zirconium compounds
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 29 Aug 2007
Last Modified: 09 Jan 2012 09:56
URI: http://eprints.iisc.ernet.in/id/eprint/10756

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