Bandyopadhyay, Sibdas and Sanyal, A S and Mukerji, Joydeb (1994) Parameters controlling the synthesis of beta-silicon nitride from silica. Key Engineering Materials, 93 (89-91). pp. 55-61. ISSN 1662-9795

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Abstract

beta-Si3N4 has been synthesized from quartz using carbothermal reduction and nitridation with iron as a catalyst. At 1540(0)C beta-Si3N4 is the main product. At lower temperature SiC and Si2N2O are the associated phases. Mossbauer studies indicate that the formation of beta-Si3N4 is associated with the existence of a Fe-Si-N liquid. The composition of the liquid is constant at 8 at% Si irrespective of the temperature used for the process. Although Fe2O3 is detected in the reaction product, its amount is very small compared to the Fe-Si-N liquid. It has been suggested that formation of beta-Si3N4 takes place by precipitation from the Fe-Si-N liquid at 1540(0)C by following the overall reduction and nitridation reaction as follows: 3SiO(2) + 6C + 2N(2) = Si3N4 + 6CO At 1440(0)C, beta-Si3N4 is formed via SiC and Si2N2O.

Item Type:	Article
Additional Information:	International Conference on Silicon Nitride-Based Ceramics Conference Date: October 04-06, 1993 SILICON NITRIDE 93; ISBN: 0-87849-668-8
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	02 Aug 2013 10:58
Last Modified:	20 Mar 2016 16:36
URI:	http://cgcri.csircentral.net/id/eprint/1928

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