A comparison study of tialite ceramics doped with various oxide materials and tialite–mullite composites: microstructural, thermal and mechanical properties

Identification of damage and cracking behaviours based on energy dissipation mode analysis in a quasi-brittle material using digital image correlation

“…Because of these microcracks, this quasi-brittle ceramic strengthened with a secondary silicate phase becomes an excellent potential material for industrial thermostructural applications. The influence of the sintering process, the microstructure, the secondary silicate phase and the thermal expansion coefficient has been widely studied (Kim and Gauckler 2008;Tsetsekou 2005) but mechanical and fracture aspects are rare in literature (Chen and Awaji 2007; Hamano et al 1985;Melendez-Martinez et al 2001). However, this ceramic is known to be damageable at room temperature because of the microcrack propagation (Leplay et al 2010).…”

Formation of Aluminum Titanate with Small Additions of MgO and SiO2

“…This is because of their low thermal expansion coefficient (0.2 -1x10 -6 K -1 ), low Young's modulus, high melting point (~1860 o C), low thermal conductivity (0.9 -1.5 Wm -1 K -1 ) and outstanding thermal shock resistance which can reach up to 500 Wm -1 1-4 . However, a pronounced anisotropy in thermal expansion coefficient, typical of aluminum titanate, induces severe microcracking during the cooling process that takes to damage mechanical properties of the final sintered material 1,5 . The anisotropic behavior is due to the crystal structure of the Al 2 TiO 5 which is isomorphous with pseudobrookite (Fe 2 TiO 5 ), crystallizing in the orthorhombic space group Cmcm, with a theoretical density of 3.70 g/cm 3 .…”

Stabilized tialite–mullite composites with low thermal expansion and high strength for catalytic converters

“…The maximum decomposition rate is reached between 1100 and 1150 • C and the reaction completes after 5-50 h. 13 Yet, the decomposition temperature is believed to change depending on precursor's particle size. [12][13][14] Some oxide dopants like SiO 2 , ZrO 2 , 11 MgO, 10,14,15 Fe 2 O 3 , 2,16 mullite, [17][18][19][20] ZrSiO 4 14 and rare-earth oxides have been used to control the decomposition. Among these stabilizers, Fe 2 O 3 and MgO appear to offer a high degree of phase stability in critical conditions.…”