REDUCTION OF SHRINKAGE AND INCREASE OF HEAT RESISTANCE OF THE MODEL COMPOSITION BY TiO2 and ZnO NANOPARTICLES

UDC 676.085.4

 

Prokopchuk Nicolay Romanovich – Corresponding Member of the National Academy of Sciences of Belarus, DSc (Chemistry), Professor, Professor, the Department of Polymer Composite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: nrprok@mail.com

Klyuev Andrey Yur’yevich – DSc (Engineering), Professor, the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: andrey_kluev_bstu@mail.ru

Laptik Inna Olegovna – engineer, the Department of Polymer Composite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: inna.laptik@yandex.ru

 

DOI: https://doi.org/ 10.52065/2520-2669-2024-277-6.

 

Key words: model composition, precision casting, moldable models, TiO2 and ZnO nanoparticles, softening temperature, Ubbellode drop-off temperature, linear shrinkage.

For citation: Prokopchuk N. R., Klyuev A. Yu., Laptik I. O. Reduction of shrinkage and increase of heat resistance of the model composition by TiO2 and ZnO nanoparticles. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2024, no. 1 (277), pp. 50–54 (In Russian). DOI: 10.52065/2520-2669-2024-277-6.

Abstract

The modification of the model composition of ZGV-101 for precision casting of metal products according to smelted models with TiO2 and ZnO nanoparticles was carried out. A laboratory technology for the introduction of TiO2 and ZnO nanoparticles into the model composition produced by Tomsk Nanopowders LLC has been developed. Model compositions with different concentrations of nanoparticles, wt. %: 0.005; 0.05; 0.1 were obtained. The development of model compositions with reduced linear shrinkage is an urgent task, since such compositions make it possible to bring the dimensions of the casting as close as possible to the dimensions of the finished part. A significant decrease in the linear shrinkage of the model composition by nanoparticles from 0.8% to 0.44% (0.005 wt. %TiO2 and ZnO). A hypothesis has been proposed to explain the decrease in shrinkage and increase in heat resistance of the model composition of ZGV-101: TiO2 and ZnO nanoparticles, possessing energetically active surfaces, interact physically with the carboxyl and hydroxyl groups of components that make up ZGV-101. The formed physical grid reduces the mobility of the molecular structures of the composite, increases its stability in temperature and force fields. An almost significant increase in the heat resistance of the composition of ZGV-101 was found: the softening temperature increased from 54°C to 61°C (0.005 wt. % TiO2) and up to 63°C (0.005 wt. % ZnO). The drop-off temperature of the Ubbellode rises from 80°C to 87°C (0.005 wt. % TiO2) and up to 86°C (0.005 wt. % ZnO).

 

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13.12.2023