Mechanical Properties and Contact Damages of Nanostructured Silicon Carbide Ceramics

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  • LEE Seung Mo
    School of Mechanical and Automotive Engineering, Kookmin University
  • KIM Tae Woo
    School of Mechanical and Automotive Engineering, Kookmin University
  • LIM Hong Je
    School of Mechanical and Automotive Engineering, Kookmin University
  • KIM Chul
    School of Mechanical and Automotive Engineering, Kookmin University
  • KIM Young Wook
    Department of Materials Science and Engineering, University of Seoul
  • LEE Kee Sung
    School of Mechanical and Automotive Engineering, Kookmin University

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Three types of nanostructured silicon carbide ceramics were prepared with additives of Al2O3 and Y2O3 as the primary sintering additives, together with 1 mass% CaO, 1 mass% MgO or 0.73 mass% AlN. The silicon carbides (SiC) containing tens of nanometers of grains were successfully fabricated using a two-step sintering process. The mechanical properties and contact damages of the nanostructured SiC ceramics were investigated in this study. The nanostructured SiC ceramics exhibited a hardness of~20 GPa, a strength of 400-700 MPa, and a toughness of 3.0 MPa•m1/2. The nature of the contact damage exhibited classical ring or cone cracks formed in a region of weak tension outside the contact rather than microcracks in the diffuse quasi-plastic zones as observed in heterogeneous microstructures consisting of micron-sized elongated grains.<br>

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