Abstract
A single-step dip-coating technique was developed to produce stable films or washcoats of controlled thickness, surface area and pore-size distribution on alumina whisker-covered metal substrates (both flat plates and monoliths). Dip-coating slurries were prepared by dispersing fine porous powder in a colloidal silica sol. The method provided control over coating thickness and coating properties, such as pore-size distribution and surface area. The coating thickness could be varied between approximately 2 and 40 μm by selecting slurry composition and withdrawal speed in the dipping procedure. The pore-size distribution and surface area could be varied by changing type and amount of porous filler material in the dipping slurry. Uniform and bimodal pore-size distributions were obtained using silica and ZSM-5 molecular sieves, respectively, yielding coatings with surface areas between 60 and 400 m2g−1.
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Zwinkels, M.F.M., Järås, S.G., Menon, P.G. et al. Preparation of anchored ceramic coatings on metal substrates: a modified sol-gel technique using colloidal silica sol. JOURNAL OF MATERIALS SCIENCE 31, 6345–6349 (1996). https://doi.org/10.1007/BF00354459
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DOI: https://doi.org/10.1007/BF00354459