Preparation of Al2O3-Si3N4 porous ceramics with a cactus-like architecture for potential filters applications

摘要

In the present work, Al2O3-Si3N4 porous ceramics with a cactus-like architecture were fabricated by calcining Al2O3-Si binary particle-stabilized foams in the nitrogen atmosphere. A large number of acicular Si3N4 nanobelts were constructed on the surface of cell walls as a consequence of CVD process to achieve an interlaced network. Such structure was beneficial to realize a high capture efficiency of particulate matters (PM) during filtration. Resultant products having a bulk density of 0.38 g/cm(3) at an apparent porosity of 86% can potentially be applied as the air filters in environment field.