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    • Keywords


      Sintering; X-ray methods; electron microscopy; grain growth; solid solubility.

    • Abstract


      Chemically pure reactive alumina (𝛼-Al2O3) which is commercially available was used for densification study in presence of widely accepted dopant MgO as additive. MgO was added both as spinel (MgAl2O4) forming precursor i.e. magnesium aluminate hydrate, and magnesium nitrate. Sintering investigations were conducted in the temperature range 1500–1600°C with 2 h soaking. Structural study of sintered pellets was carried out by extensive XRD analysis. Scanning electron mode SEM images of the specimens were considered to understand the effect of both types of additions. Addition of MgO within and beyond optimum amount had some effect on development of microstructure of sintered bodies. Densification, around 99% ρth, with fine grain microstructure was achieved. These different types of additions caused two distinct changes in crystal structure of alumina-one small contraction and the other expansion of unit cell parameters.

    • Author Affiliations


      Soumen Pal1 A K Bandyopadhyay1 S Mukherjee2 B N Samaddar3 P G Pal1

      1. Department of Ceramic Technology, Government College of Engineering and Ceramic Technology, Kolkata 700 010, India
      2. School of Material Science and Technology, Jadavpur University, Kolkata 700 032, India
      3. Department of Metallurgical and Material Engineering, Jadavpur University, Kolkata 700 032, India
    • Dates

  • Bulletin of Materials Science | News

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      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
      Physical Sciences 2020

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      Posted on July 25, 2019

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