Abstract
The authors of the article focus on the problem of understanding and modeling the process of impregnation of porous aluminum casting with polymer compositions, which plays a vital role in solving the problem of reducing the share of production defects and ensuring the required service life of cast products. The distinctive features of macro- and micropores formed in castings made of aluminum alloys are formulated. A brief description of the process of impregnation of micropores is given, the features associated with the simultaneous occurrence of chemical reactions involving polymer compositions, as well as heat and mass transfer and filtration under conditions of different temperatures and pressures are described. A list of basic operations is provided. Attention is drawn to the complexity of describing the impregnation process from the position of classical theory. A fairly simple to understand physical and mathematical model of impregnation of a porous aluminum casting with a polymer infiltrate - a liquid polymer composition filtering through a defective zone of micropores in the casting - is proposed. The model is based on the well-known scheme of plane-parallel filtration of liquid through an idealized isotropic porous medium. A calculation formula has been obtained to estimate the theoretical minimum required duration of the impregnation process. The conditions for its application are formulated. The results of the calculation performed in relation to a specific problem are presented, explaining the instability of the results obtained in practice.
Keywords:
aluminum casting, porosity, impregnation, filtration, polymer composition.