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    • Keywords


      Agglomeration; stoichiometry; spinellization; solid solution.

    • Abstract


      Precipitation of magnesium aluminate hydrate with faster addition of ammonia at desired pH causes agglomeration. Agglomerated powder, without any further treatment, on calcination forms intermediate compounds at low temperatures (≤ 900°C). The intermediate compounds on further heat treatment (≥ 1000°C) decompose into MgO, MgAl2O4 and 𝛼-Al2O3. Effect of agglomeration and absorption of foreign ions such as Cl, SO$^{2-}_{4}$, and NH$^{+}_{4}$ in complex compounds probably cause loss of Al3+ and Mg2+ ions during heat treatment, and stoichiometry changes. Powders prepared by continuous method with better control of process parameters than batch process yields better spinellization.

    • 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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      Posted on July 25, 2019

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