Samanta, A K and Dhargupta, K K and Ghatak, S (2000) SiC-YAG sintered composites from hydroxy hydrogel powder precursors. Ceramics International, 26 (8). 831 -838. ISSN 0272-8842

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Abstract

Yttrium hydroxide and aluminium hydroxide hydrogel were derived from yttrium nitrate and aluminium nitrate through hydroxy hydrogel route in which SiC particles were kept dispersed. The gel-like mass was heat treated at 900 degreesC in ambient atmosphere followed by heat treatment at 1400 degreesC in Ar atmosphere. The specimens were then sintered in the temperature range of 1800-1950 degreesC in Ar atmosphere with 30 min soaking. The phases were identified by XRD analysis. Microstructure of the sintered materials were analysed by scanning electron micrograph. With this new method of preparation:of powder precursors, the process of sintering was easier and almost theoretical density was achieved with moderate hardness. The mechanism of densification was postulated to be a solid-state initiated liquid phase sintering and the overall process of which was activated by the reactive species formed from hydroxy hydrogel powder precursors

Item Type:	Article
Uncontrolled Keywords:	precursors; hydroxyhydrogel; densification; reactive
Subjects:	Ceramic-Metal Systems
Divisions:	UNSPECIFIED
Depositing User:	Mrs Chandana Patra
Date Deposited:	09 Feb 2012 12:31
Last Modified:	09 Feb 2012 12:31
URI:	http://cgcri.csircentral.net/id/eprint/745

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