• Aqueous slip casting of MgAl2O4 spinel powder

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      https://www.ias.ac.in/article/fulltext/boms/034/02/0327-0335

    • Keywords

       

      MgAl2O4 spinel; phosphate coating; aluminium dihydrogen phosphate; orthophosphoric acid; slip casting; freeze granulation; double-stage firing process.

    • Abstract

       

      A stoichiometric MgAl2O4 spinel (MAS) powder was synthesized by calcining a compacted mixture of 𝛼-Al2O3 and calcined caustic MgO at 1400°C for 1 h and was surface treated against hydrolysis using an ethanol solution of H3PO4 and Al(H2PO4)3 after fine grinding. Aqueous suspensions with 41–45 vol.% treated powder were prepared using tetra methyl ammonium hydroxide (TMAH) and an ammonium salt of polyacrylic acid (Duramax D-3005) as dispersing agents. These stable suspensions were consolidated in plaster moulds by slip casting (SC) route for the first time. For comparison purposes, the treated powder was also compacted by die-pressing technique after converting into freeze-dried granules and sintered along with slip cast samples at 1550–1650°C for 1–2 h. The MAS ceramics fabricated by slip casting and die-pressing exhibited comparable properties.

    • Author Affiliations

       

      Ibram Ganesh1

      1. Centre for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, India
    • Dates

       
  • Bulletin of Materials Science | News

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