Abstract
To improve mechanical properties, well dispersed Al2O3 / TiO2 powders are prepared by the citrate process and Al2O3 / Al2TiO5 composites are obtained by hot-pressing the powders. Hot-pressing is carried out at 1350°C for 45 minutes under a pressure of 30MPa in N2 atmosphere. Formation of Al2TiO5 is ascertained by XRD analysis for all composites. The mechanical strength decreases with increasing addition of TiO2. The composite containing 30vol% TiO2, however, exhibites 100MPa in bending strength, while it still re-taines a low thermal expansion coefficient, i. e. 4.6x10-6 from R.T. to 1000°C.
