Rakshit, J and Mukerji, Joydeb (1990) Properties of reaction bonded silicon-nitride obtained from slip cast preforms. Bulletin of Materials Science, 13 (4). pp. 259-270. ISSN 0250-4707

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Fabrication of silicon preforms of high green density (> 1.2 g/cm3) by slip casting of silicon (in aqueous medium) has been studied. The nitridation product consists of 59-85% alpha-Si3N4, 7-22% beta-Si3N4 and 7-23% Si2N2O phase. The amounts of un-nitrided silicon were negligible. The microstructure is either granular or consists of needle-like grains (alpha-Si3N4) and whiskers deposited in the large pores. MOR values of the specimens are almost constant up to 1000-degrees-C or 1400-degrees-C or show slight increase up to 1000-degrees-C or 1200-degrees-C. In some cases a little dip around 1200-degrees-C, then a sharp increase in MOR up to 1400-degrees-C was observed. K(ic) values are almost constant up to 1000-degrees-C, and thereafter increase sharply. Pore size distribution, existence of Si2N2O phase and oxidation of RBSN at high temperatures have been considered for the explanation of the observed behaviour.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 01 Mar 2016 11:59
Last Modified: 03 Mar 2016 05:10
URI: http://cgcri.csircentral.net/id/eprint/3182

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