EFFECTS OF A CaO ADDITIVE ON THE STRUCTURE AND PROPERTIES OF ALUMINIUM TITANATE CERAMICS

Al 2 TiO 5 based ceramics with high mechanical strength and good thermal shock resistance were successfully prepared by adding 1-7 % CaO to the alumina titanium dioxide mixtures at 1280-1380 ℃ for 0.5 h, and the effects of the CaO additive and firing temperature on the phase composition and thermo-mechanical properties of the Al 2 TiO 5 ceramics were investigated in the present work.The results show that CaO could promote the formation of the Al 2 TiO 5 solid solution, showed a significant impact on the development of the phase composition.The aluminium titanate ceramics sintered with 3 % CaO at 1350 ℃ for 30 min gave an average thermal expansion coefficient of (20-600 ℃) 0.83×10 -6 K -1 , and a bending strength before and after three thermal shock cycles in water from 600 ℃ to room temperature of 40.59 MPa and 42.23 MPa, respectively.