The main aspects of washcoating of ceramic monolith by nano γ-Al2O3 slurry were studied. Some of the deposition characteristics of the washcoat such as morphology and homogeneity, specific load, thickness of the layer and adherence were examined. SEM was applied to assess the quality of the washcoat layer and measure its thickness. The adhesion of nano γ- Al2O3 washcoat on cordierite monolith was investigated by a vibrational ultrasonic and thermal shock tests. Nano γ-Al2O3 washcoat forms a good homogeneous layer on the monolith in comparison with the common micron size γ-Al2O3 particles, but some cracks appeared on washcoated layer.

Keywords: Nano γ-Al2O3, Washcoating, Cordierite monoliths, Loading percentage, Adhesion test, Morphology.