par Khan, Asif ;Balapanov, Daniyar ;Glushchuk, Andrey ;Mehdi, Feizpour Dr.;Iorio, Carlo Saverio
Référence Powder technology, 458, 0032-5910, 121016
Publication Publié, 2025-04-07
Article révisé par les pairs
Résumé : In light of the growing interest in carbon-based coatings, this paper investigates the influence of graphenecoatings on the main hydrodynamic characteristics of sintered porous media. We developed a consistentmethodology for coated porous medium characterization, which involves measurement techniques for the threemost important parameters: porosity, capillary pressure, and permeability. The latter required special attentionbecause of the coating fragility, which prevented the application of the conventional forced flow method. Thus, amass rate-of-rise principle has been used, where the absorbed liquid mass is monitored in time and then fitted tothe Lucas-Washburn model. The model’s validity is strictly proven for the particular experimental conditions andthe samples, as well as the rigorous theory for uncertainty estimation in the case of the least squares method.Using a pressing technique, the authors created porous samples of stainless-steel 316 L polydisperse and nickelspherical particles. The graphene coating is applied by the chemical vapour deposition technique. We found thatthe coating reduces the porosity and permeability of the nickel samples and increases their capillary pressure,with this influence proportional to the synthesis time. Conversely, the stainless-steel 316 L samples evidencedunintuitive results with 3D disordered carbon addition. The variation in porosity and permeability is within themeasurement uncertainty, and capillary pressure exhibits an inverse dependence on the deposition process time.The measurement results are correlated with the analysis of the porous space structure and the coating structureobtained by SEM imaging and Raman spectroscopy.

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