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

      J Rakshit J Mukerji

      Volume 13 Issue 4 September 1990 pp 259-270

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/013/04/0259-0270

    • Keywords

       

      Reaction-bonded silicon nitride; slip cast silicon preforms

    • Abstract

       

      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.

    • Author Affiliations

       

      J Rakshit1 J Mukerji1

      1. Central Glass and Ceramic Research Institute, Jadavpur, Calcutta - 700 032, India

    • Dates

       
      Published
      September 1990
      Manuscript received
      24 November 1990

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