Microcrack orientation in porous aluminum titanate

Impact of the non-linear character of the compressive stress–strain curves on thermal and mechanical properties of porous microcracked ceramics

“…2. Aluminum titanate (AT), with 38% porosity, has high microcrack density and the presence of three phases (AT, feldspar and alumina 30,32 ), while cordierite (with 48% porosity) is nearly single phase, with presence of glass pockets (bright islands) and minor secondary phases (grey features), such as spinel and sapphirine. Although the field of view does not allow quantitative estimation of the amount of microcracking, it is clear that in the case of cordierite, the density of microcracks is substantially lower.…”

“…30 Honeycomb logs were dried and then fired at temperatures exceeding 1450 • C, with both heating and cooling done in ambient atmosphere with rates not exceeding 5 • C/min (for more details see 31 ). Also in this case, crystallographic texture data are available in the literature, 32 and show a slight tendency of c-axis grains to align to the extrusion axis (texture 1.3× random).…”

Single crystal growth of CoTi2O5 by solid state reaction synthesis

“…However, the isostructural phases Al 2 TiO 5 and MgTi 2 O 5 are known for their low thermal conductivity and low thermal expansion, and have applications where thermal insulation and thermal shock resistance are required such as in combustion engines and catalyst carriers . A primary drawback for these materials is their strong anisotropy of thermal expansion, which leads to poor strength due to extensive microcracking . Promoting texturing via single crystal growth may represent a means of improving these materials.…”

Preparation of monolithic aluminium titanate with well-defined macropores via a sol–gel process accompanied by phase separation

“…However, only powder and film but not monolithic aluminium titanate material were obtained. Moreover, compared with the monoliths composed of conventional particle-packed structure, the monoliths with cocontinuous macroporous structure display a superior performance for the applications in various kinds of fields due to the unique macrostructure [12,14]. For instance, when used as support materials, a monolithic shape provides suitable mechanical strength and the presence of interconnected macropores leads to high permeability and allows facile fluid transport [24,25].…”

“…For example, porous aluminium titanate with honeycomb structure has been successfully used as substrate material for diesel particulate filters, exhibiting better performance than cordierite and SiC [9][10][11]. One common method for the fabrication of porous aluminium titanate is solid-state sintering from Al 2 O 3 and TiO 2 powder, using some modifying agents like SiO 2 and Fe 2 O 3 to improve the stabilization of Al 2 TiO 5 and pore-forming agents like spherical corn starch [12][13][14][15]. However, porous aluminium titanate material with cocontinuous macroporous structure has not been reported yet.…”