Abstract
A stoichiometric MgAl 2 O 4 spinel (MAS) powder was synthesized by calcining a compacted mixture of $\boldsymbol{\alpha} $ -Al 2 O 3 and calcined caustic MgO at 1400°C for 1 h and was surface treated against hydrolysis using an ethanol solution of H 3 PO 4 and Al(H 2 PO 4 ) 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.
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