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Abstract

The present invention relates to a method for the passivation of MgAl₂O₄ (Mg-spinel) powders against hydrolysis exhibiting in aqueous media by coating the surfaces with Al₂O₃ during the synthesis via flame pyrolysis technique. Stable aqueous suspensions with high solid loading and low viscosity can be prepared from coated powders with a core/shell structure of MgO.nAl₂O₃ (0.652O₃. Such suspensions might not only ensure production of high quality granules, but also enable production of green bodies with high density and homogeneity through wet forming methods. Accordingly, precise microstructural control can be ensured during sintering. Al₂O₃ shell re-dissolves within the core during sintering at variable temperatures depending on the core stoichiometry (n value). The final stoichiometry might be altered by controlling the “n” value of the core, the shell thickness and particle size distribution.

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First Claim