Abstract
In this work, a novel method for coating the polymeric substrate with an aqueous metallic powder (Aluminum) solution was developed. In the modified fluidized bed, assisted bottom spray coater was used to achieve the strong interfacial coating of the aluminum on the fluidized spherical expanded polystyrene (EPS) substrate and polyvinyl alcohol (PVA) as a binder. The coated aluminum metal exhibits a layered thickness of 340 ± 50 µm. The effect of fluidization airflow rate, spray rate, atomization air pressure, and inlet air temperature on the aluminum coating on the EPS spheres was investigated for the first time. The substantial integrity, interfacial bonding and surface morphology of aluminum coating were confirmed through XRD, FTIR, shaking test and SEM analysis. In addition, a remarkably high dielectric constant of 12,000 compared to the dielectric constant of the pristine EPS sphere of 60 at low frequency was observed.
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