Aqueous slip casting of MgAl2O4 spinel powder |
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| Authors: | IBRAM GANESH |
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| Affiliation: | (1) Dipartimento di Ingegneria Chimica E Scienza Dei Materiali, Politecnico di Torino, INSTM, R.U. PoliTO, LINCE Lab, Corso Duca degli Abruzzi 24, 10129 Turin, Italy;(2) Dipartimento di Ingegneria Dei Materiali E Dell’Ambiente, Universit? di Modena E Reggio Emilia, INSTM, R.U. UniMORE, LINCE Lab, Via Vignolese 905, 41125 Modena, Italy |
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| Abstract: | A stoichiometric MgAl 2 O 4 spinel (MAS) powder was synthesized by calcining a compacted mixture of aboldsymbol{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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