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Preparation of alumina-zirconia materials by the sol-gel method from metal alkoxides

1995; Elsevier BV; Volume: 185; Issue: 1-2 Linguagem: Inglês

10.1016/0022-3093(94)00680-6

1873-4812

Yu Wen Chen, Tzu-Ming Yen, Chiuping Li,

Aerogels and thermal insulation

Abstract This study was carried out to develop a new preparation process for porous alumina-zirconia by the sol-gel method and to examine their porous properties. The gelation of alkoxides by the sol-gel method was for the formation of a precursor composed of an alumina-zirconia network structure. By this process, porous alumina-zirconia with a large surface area (> 300 m 2 /g), a very small pore size (0.5–0.9 nm) and a small pore size distribution was prepared. The porous properties of these materials were dependent upon the zirconia content. The optimum ratios of raw materials forming the gels are C 2 H 5 OH/Al(OC 4 H 9 ) 3 = 100/1, Al(OC 4 H 9 ) 3 /H 2 O = 2/1, Al(OC 4 H 9 ) 3 /HNO 3 = 20/1, Zr(OC 4 H 9 ) 4 /H 2 O = 4/1 (in moles), which gives a transparent gel and shortest gelation time.