Samanta, A K and Dhargupta, K K and Ghatak, S (2000) Retention of SiC during development of SiC-MxSiyOz composites [M = Al, Zr, Mg] by reaction bonding in air. Journal of the European Ceramic Society , 20 (12). 1883 -1894 . ISSN 0955-2219

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Abstract

Oxidation of SiC is a major constraint during development of metal oxide-silicon carbide composites when processed in oxygen containing environment such as in air. In the present investigation, Mg+2, Al+3 and Zr+4 hydrogels were used as a source of respective oxide and oxidation of SiC in each system was studied. A three-stage mechanism was found to be operative in Al+3 and Zr+4 systems where oxidation at the initial stages was found to be controlled by the nature of the polynuclear complexes formed on the surfaces of SiC particles. At the intermediate stage a transition from polynuclear complex to metal silicate protective layer formation changes the oxidation characteristics. Finally the metal silicates provided the ultimate protection. Mg+2 was found to be ineffective. The extent of retention of SIC in the final composites could be premonitored by controlling the amount and the nature of complexing cations.

Item Type:	Article
Uncontrolled Keywords:	composites; oxidation; reaction bonding; SiC; silicates
Subjects:	Electronics
Divisions:	UNSPECIFIED
Depositing User:	Mrs Chandana Patra
Date Deposited:	06 Feb 2012 07:57
Last Modified:	15 Feb 2017 07:35
URI:	http://cgcri.csircentral.net/id/eprint/655

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