• N C Biswas

      Articles written in Bulletin of Materials Science

    • Zirconia-mullite ceramics by reaction-sintering

      B L Mitra N C Biswas P S Aggarwal

      More Details Abstract Fulltext PDF

      Zirconia-mullite composites were prepared byin situ reaction between zircon and alumina. Stabilizers like yttria and magnesium carbonate were used. Almost vitrified bodies were obtained by sintering at 1465–1535°C. Flexural strength increased on annealing at 1040°C.

    • Thermomechanical properties and microstructure of aluinina-zirconia

      B L Mitra N C Biswas P S Aggarwal

      More Details Abstract Fulltext PDF

      Al2O3-ZrO2 composites were prepared in two compositional ranges, 15 wt% ZrO2 and 29wt% ZrO2 with or without yttria or magnesia stabilizers. While 1.5 wt% Y2O3 produced tetragonal ZrO2 and fine grain microstructure, the 4.5 wt% Y2O3 developed cubic and tetragonal ZrO2 with similar microstructure. Al2O3 with 29.5wt% ZrO2-1.5wt% Y2O3 composition had the highest strength (3,300 kg/cm2). The bending strength remained more or less the same after the first thermal shock, and then it decreased gradually, but retained some strength after 20 cycles of quench. The load vs displacement curve became nonlinear after thermal shock possibly because of formation of microcracks which could be seen by microstructural studies.

    • Comparative study of zirconia-mullite and alumina-zirconia composites

      N C Biswas S P Chaudhuri

      More Details Abstract Fulltext PDF

      Several zirconia-mullite and alumina-zirconia composites were prepared and their physical, chemical, mechanical and thermal properties determined. The phase assemblage, size of ZrO2 crystals and microstructure of the composites were ascertained. This paper embodies a comparison of the alumina-zirconia and zirconia-mullite composites with respect to their properties and also the constitution-property relationships between each group of composites. Alumina-zirconia composites (AZ) were found to be superior to zirconia-mullite composites (prepared through ZMS or ZMC route) in almost all respects. Thermal-shock resistance and hydration resistance of the clay-based zirconia-mullite (ZMC) composites and alumina-zirconia (AZ) composites were almost at par.

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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      Posted on July 25, 2019

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