Work

Combined dip/spin coating deposition of Ni/CeO2 and Ni/CeO2-Al2O3 onto 3D printed AlSi10Mg Periodic Open Cellular Structures (POCS)

Year: 2025

Type: article

Abstract: The effect of catalyst formulations and deposition procedures to deposit thin active layers based on Ni/CeO2 and Ni/CeO2-Al2O3 onto AlSi10Mg Periodic Open Cellular Structures (POCs) with cylindrical shape (10 mm diameter and 15 mm length) was experimentally assessed in this work. An aqueous liquid medium based on water, glycerol, and polyvinyl alcohol was used for powder dispersion, while a combined dip- /spin- coating technique was chosen for washcoat deposition on metallic 3D printed structures characterized by Body-Centered Cubic (BCC) and Kelvin unit cell. The rheological behaviour of the prepared slurry was also studied. Multiple depositions with intermediate flash drying steps at 450 °C were carried out. Washcoat loads of about 15% (0.1g/cm3) were obtained. The used powders were characterized by BET, XRD and pycnometry, instead, the as built and activated supports were characterized by SEM/EDX and pycnometry. No pore clogging phenomena were observed and irrespective of the geometry used, the layers are deposited homogeneously. Adhesion of the deposited layers, evaluated by means of accelerated stress test in ultrasound bath, pointed out that the thermal/anodization pre-treatment of supports or the primer utilization play a crucial role in achieving high mechanical stability associated to weight loss between 0.86 and 12.7wt%.

Source: Applied Surface Science Advances

DOI: 10.1016/j.apsadv.2025.100731