• J Rakshit

      Articles written in Bulletin of Materials Science

    • Properties of reaction bonded silicon nitride obtained from slip cast preforms

      J Rakshit J Mukerji

      More Details Abstract Fulltext PDF

      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% α-Si3N4, 7–22%β-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 (α-Si3N4) and whiskers deposited in the large pores. MOR values of the specimens are almost constant up to 1000°C or 1400°C or show slight increase up to 1000°C or 1200°C. In some cases a little dip around 1200°C, then a sharp increase in MOR up to 1400°C was observed.Kic values are almost constant up to 1000°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.

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