Mukerji, Joydeb and Rakshit, Jaganmoy (1988) Dependence of strength and toughness of reaction bonded silicon nitride and composites on fabrication routes. Ceramics International, 14 (3). pp. 181-189. ISSN 0272-8842

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Nitridation characteristics of silicon compacts made by uniaxial and isostatic pressing and slip casting, respectively, have been studied. α and β-Si3N4 were the major phases in uniaxially and isostatically pressed specimens, and α phase being over 90%. In slip cast specimens around 20% Si2N2O was detected. The uniaxially pressed and nitrided samples showed a regular rise in MOR and KIC up to 1200°C, falling thereafter. Temperature-independent values were observed for isopressed samples. Slip cast specimens on the other hand showed a rise with temperature, and sharply increased after showing a dip at 1200°C. The MOR and KIC values did not fall at 1400°C. Si3N4 SiC composites show improved values of MOR and KIC when SiC is 5 vol%;Si3N4 BN (3·6 vol%) and Si3N4 TiC (5 vol%) show an inflection in the MOR and KIC curves above 1200°C which do not deteriorate even at 1400°C. Oxidation, pore size distribution and nature of phases present in RBSN and composites have been considered for explanation of the observed behaviour.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Nov 2013 12:04
Last Modified: 18 Mar 2016 17:49

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