In Situ Reaction Sintered Alumina/Aluminium Titanate Composites Prepared with Micro and Nanosized TiO2 Additions

Alumina/aluminum titanate composites with 2, 10 and 20 wt.% Al2TiO5 were prepared using reaction sintering of alumina and titania. Nano and micro sized TiO2 powders were used to composites fabrication. X-ray diffraction analysis results revealed the perfect reaction of nano and micro TiO2 with alumina at 1500 ºC cause to formation of Al2TiO5 as secondary phase. The alumina relative density increased from about 94% for monolithic alumina to about 97% at presence of TiO2 additions for all composites series. The density increment curve of the composites at the presence of nano TiO2 addition was above the micro-sized addition. The density of composite contain 20 wt.% Al2TiO5 the density increased from 97% at presence of micro-sized TiO2 to 98% for nano type. Also the strengths values of the nanocomposites series were higher than the micro composites. Specially, for the composites contains 10 wt.% aluminum titanate the bending strength for nano and microcomposites were 292 and 269 MPa respectively.