Reactive sintering and microstructure of uniform, openly porous Al 2 TiO 5

Abstract

Uniform, openly porous Al 2 TiO 5 , with a narrow pore-size distribution was prepared by reactive sintering. The effect of different starting powders, commercially available α-Al 2 O 3 , γ-Al 2 O 3 , TiO 2 anatase, and TiO 2 rutile powders, used as the starting materials, is discussed. Four combinations of Al 2 O 3 and TiO 2 mixed powders were reactively sintered at 1300-1500°C for 2h in air. The sample, made from the γ-Al 2 O 3 /TiO 2 rutile powder sintered at 1350°C, had a narrow pore-size distribution at 0.8μm, moderate fracture strength and low thermal expansion which were favorable for recyclable household water-purification filters. © 2013 The Ceramic Society of Japan and the Korean Ceramic Society.