Experimental study on toughening of porous cordierite ceramic prepared by particle-stabilized emulsions

Abstract

The majority of work has focused on the toughening of porous cordierite ceramics (PCC), which has a uniform and homogeneous porous structure prepared by the particle-stabilized emulsions after sintering at ∼1300 ℃ for 2 h. The particle sizes of raw materials were adjusted to 20 nm to ensure that all samples maintained the same porous structure, which prevented crack propagation from separating. PCC's bending strength increased by up to ∼214% at ∼4 wt% ZrO2 content, which absorb energy to improve fracture toughness. The addition of mullite fibers created new intermolecular forces between colloidal particles and filler parameters, which played a negative impact on the stability of the micelle shape, resulting in unsuccessful foaming and toughening. Rod-shaped cordierite crystals with a large aspect ratio were formed on the inner wall of PCC with 3 wt% AlF3 and created a short network in situ, which improved the bending strength of the tensile structure by strengthening crack deflection and crack bridging.