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      https://www.ias.ac.in/article/fulltext/boms/024/02/0181-0184

    • Keywords

       

      Reaction bonded SiC; indentation hardness; fracture toughness.

    • Abstract

       

      MoSi2–RBSC composite samples were prepared by infiltration of Si–2 at.% Mo melt into a preform of commercial SiC and petroleum coke powder. The infiltrated sample had a density > 92% of the theoretical density (TD) and microstructurally contained SiC, MoSi2, residual Si and unreacted C. The material was tested for indentation fracture toughness at room temperature with a Vicker’s indenter and KIC was found to be 4.42 MPa√m which is around 39% higher than the conventional RBSC material. Enhancement in indentation fracture toughness is explained in terms of bowing of propagating cracks through MoSi2/SiC interface which is under high thermal stress arising from the thermal expansion mismatch between MoSi2 and SiC.

    • Author Affiliations

       

      O P Chakrabarti1 P K Das1 S Mondal1

      1. Central Glass and Ceramic Research Institute, Kolkata 700 032, India
    • Dates

       
  • Bulletin of Materials Science | News

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