| abstract |
A porous structure comprising a ceramic material, mainly formed by or consisting of an oxide material comprising titanium, aluminum, zirconium and silicium satisfying the following composition, in wt % on the basis of the oxides:n more than 15% but less than 55% Al 2 O 3 ; more than 20% but less than 45% TiO 2 ; more than 1% but less than 30% SiO 2 ; more than 0.7% but less than 20%, in total, of at least one oxide chosen from ZrO 2 , Ce 2 O 3 and HfO 2 ; less than 1% MgO;n nsaid composition furthermore comprising other elements chosen, on the basis of oxides, from CaO, Na 2 O, K 2 O, SrO, B 2 O 3 and BaO, the total summed amount of said oxides being less than 15% but greater than 1%; and said material being obtained by reactive sintering of said simple oxides or of one of their precursors, or by heat treatment of sintered particles, satisfying said composition. |