Sol-gel synthesis of phosphate ceramic composites II
Z. Cao*, B.I. Lee*, W.D. Samuels+, L-Q. Wang+, G.J. Exarhos+
(*Clemson University, +Battelle Pacific Northwest National Laboratory)
Phosphate ceramics were synthesized using the sol-gel technique of direct reaction of P₂O₅ with tetraethoxy silane (TEOS) or titanium tetraethoxide (Ti(OEt)₄) . The reaction mechanism of P₂O₅ and TEOS was deduced using liquid and solid-state NMR. Hexacoordinated silicon in phosphosilicate gels was observed. A specially structured titanium phosphate-layered Ti(HPO₄)₂á2H₂O was synthesized for the first time through the sol-gel method. The gelation process and sintering properties were investigated.
Keywords: ceramics; phase transformation; sol-gel
Order No.: JA806-018 © 1998 MRS

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