Tubular pore material

Product formed from a ceramic material, at least part of the product not being formed from amorphous silica and comprising pores and satisfying the following criteria (a), (b) and (c):

• (a) at least 70% by number of the pores are frustoconical tubular pores extending substantially parallel to each other in a longitudinal direction;
• (b) in at least one cross-section plane, the mean size of the cross sections of the pores is greater than 0.15 μm and less than 300 μm;
• (c) in at least one cross-section plane, at least 60% by number of the pores have a convexity index Ic of greater than 87%, the convexity index of a pore being equal to the ratio of Sp/Sc of the surface areas Sp and Sc delimited by the perimeter and by the convex envelope of the pore, respectively,
• the ceramic material being chosen from the group formed by zirconium oxide, partially stabilized zirconium oxide, stabilized zirconium oxide, yttrium oxide, doped yttrium oxide, titanium oxide, aluminosilicates, cordierite, aluminum oxide, hydrated aluminas, magnesium oxide, talc, nickel oxide, iron oxides, cerium oxide, doped cerium oxide, oxides of perovskite structure, compounds comprising titanium of the type La4Sr8Ti11Mn1-xGaxO38 with 0≦x≦1 and La4Sr8Ti12-nMnnO38 with 0≦n≦1, compounds of the type BaTiO3, BaZrO3, Pb(Mg0.25Nb0.75)O3, Ba(Zn0.25Nb0.75)O3, Pb(Zn0.25Nb0.75)O3, PbTiO3, CaCu3Ti4O12, compounds of bimevox-type structure, compounds of lamox-type structure, compounds of the type SrCe1-xMxO3 with 0≦x≦1 and M being a rare-earth metal, compounds of the type BaCe1-xMxO3, with 0≦x≦1 and M being a rare-earth metal, compounds of the family LaxSr1-xScO3 with 0≦x≦1, zeolites of structure Nax1Cax2Mgx3Bax4Kx5Alx6(Six7Ox8),x9H2O, x1 to x9 being positive integers or zero satisfying the following conditions:
• x6>0, x7>0, x8>0, x9>0 and x1+x2+x3+x4+x5>0, silicon carbide, silicon nitride, boron nitride, boron carbide, tungsten carbide, molybdenum disilicide MoSi2 and titanium boride TiB2, and mixtures thereof.