Processing of particle stabilized Al2TiO5–ZrTiO4 foam to porous ceramics

Abstract Macroporous Al 2 TiO 5 –ZrTiO 4 ceramics were synthesized from particle stabilized wet foam using direct foaming process. The initial suspension for Al 2 TiO 5 (Molar ratio of Al 2 O 3 /TiO 2 being 1:1) was prepared and a secondary suspension having a molar composition 1:1 ZrO 2 /TiO 2 is blended to the initial suspension in (0, 10, 20, 30 and 50) vol%. The wet foam exhibits an air content of 79–87% and Laplace pressure from 1.38 to 2.23 mPa. It also exhibits adsorbtion free energy of about 2.62 × 10 −13  J to 10.27 × 10 −13  J, which results in irreversible adsorption of particles at the air–water interface, leading to outstanding foam stability of about 77 –87%. The final suspension was foamed, dried at room temperature and thermal analysis (TGA–DTA) of the green specimens was carried out. After sintering at 1500 °C for 1 h, the obtained porous ceramics were subjected to phase identification using XRD, EDX and microstructural analyses were performed by FESEM.