Modification of the model compound with nanodiamond particles for precise investment casting of metal articles

Abstract

Modification of the ZGV-101 model compound with nanodiamond particles, intended for precision casting of products from ferrous and nonferrous metals, produced by JSC Mining Wax Plant (Belarus), was carried out. Under laboratory conditions, a technology has been developed for introducing nanodiamond particles produced by the SP CJSC Sinta into the ZGV-101 model compound — the ASh-A brand diamond-containing charge and UDA SP brand ultrafine synthetic diamond. An assessment of the compatibility of nanoparticles with a model composition, depending on the method of its introduction has been carried out. Model compositions with different concentrations of nanoparticles were obtained, % (wt.): 0.005; 0.01; 0.05; 0.1. The heat resistance of ZGV-101 has been significantly improved; the dependences of softening temperature TS and Ubbelohde drop point TU on the concentration of nanoparticles were established, their nature was explained (a rapid increase in the heat resistance of model compounds at initial concentrations of 0.005% (wt.) and its subsequent decrease with a further increase in the content of nanoparticles). The reason for the increase in the heat resistance of the ZGV-101 model compound by nanodiamond particles at 0.001–0.005% (wt.) has been established. The hypothesis is related to the fact that at the given concentrations of nanoparticles, a spatial physical network is formed as a result of the interaction of the energetically active surface of nanoparticles with the carboxyl and hydroxide groups of components that make up ZGV-101. With an increase in the content of nanodiamond particles above 0.01–0.02% (wt.) in the composition, the uniformity of their distribution over the volume of the model compound is disturbed due to partial aggregation, and their connection with the functional groups of the composition components decreases.The paper is recommended to be published by the Organizing Committce of the International Symposium “Nanophysics and nanomaterials (November 24–25, 2021, St.Perersburg, St.Perersburg mining university).