Mechanical behavior of cordierite and cordierite-mullite materials evaluated by indentation techniques

CAMERUCCI, MA; GUILLERMINA URRETAVIZCAYA; CAVALIERI ANA,

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

Elsevier

Lugar: Oxford; Año: 2001 vol. 21 p. 1195 - 1204

0955-2219

Commercially available cordierite and mullite powders were used to obtain cordierite and composite materials with mullite content up to 65% by attrition milling, uniaxial pressing and sintering. Cordierite powders were the coarse, medium and fine single granulometric fractions and the binary mixtures of them with 30, 50 and 70 % of the smaller component. Mullite powder employed in composites was the 7h-attrition milled one. The Vickers hardness (Hv) and fracture troughness (KIc) were measured by Vickers indentation techniques. The Knoop hardness (Hk) and Young´s modulus (Ek) were estimated by Knoop indentation method. Fracture surfaces of sintered materials were analyzed using a scanning electron microscope (SEM). The indentation load to determinate the fracture parameters was previously determined. The influence of the porosity, incresing mullite and glassy  contents and grain size on the mechanical parameters were anlalyzed and a fracture mechanism was proposed.