• Optimization of processing parameters for making alumina-partially stabilized zirconia laminated composites

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      https://www.ias.ac.in/article/fulltext/boms/023/02/0109-0117

    • Keywords

       

      Al2O3-Y-PSZ laminated composites; hot pressing; residual stress; transverse cracks; longitudinal cracks

    • Abstract

       

      The aim of the work was to optimize the processing parameters for fabricating laminated ceramic composites of Al2O3–Y–PSZ. Composites of different layer thicknesses, starting from 2 mm and going down up to 0·3 mm, were made by hot-pressing. The different types of cracks originating in the composite were studied in detail and the reason behind their formation analysed. The observed main reasons for crack formation were: (i) differential shrinkage in between the co-sintering layers due to their different sintering kinetics, (ii) thermal expansion mismatch, and (iii) a tensile component of the residual stress in the layer under residual compressive stress. After this defect analysis, suitable remedial measures were taken to avoid the crack formation. And finally a laminated composite with fifteen layers of 0.3 mm thickness was made successfully.

    • Author Affiliations

       

      S Deb1 B V Radhakrishna Bhat1

      1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad - 500 058, India
    • Dates

       
  • Bulletin of Materials Science | News

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