International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Peculiarities of titanium carbide obtainment by high voltage electric discharge synthesis (HVED) are considered in present paper. Mathematical and physical modelling of processes that occur during HVED impact on “Ti powder – hydrocarbon liquid” disperse system is performed. HVED creates thermodynamic conditions for pyrolysis of hydrocarbon liquid with formation of solid-phase carbon and gaseous hydrogen and for synthesis of titanium carbide during reaction of carbidization between titanium and carbon particles. Regularities of connection between HVED parameters and changes of dispersity and intensity of titanium carbide formation.

CoO, CuO or NiO supported on Al₂O₃ photocatalysts were prepared by impregnation and then calcination at 400^oC for 3 hours. The obtained samples were physico-chemically studied by Powder X-ray diffraction analysis, X-ray photoelectron spectroscopy and Scanning electron microscopy. The photocatalytic oxidative degradation of aqueous solution of Malachite Green (MG) dye as pollutant using CoO, CuO or NiO supported on Al₂O₃ under UV irradiation was tested. The results determined that the highest degree of degradation of MG dye after 120 minutes was achieved using NiO/ Al₂O₃ photocatalyst (82%) than that the other materials CuO/Al₂O₃ (64%), CoO/Al₂O₃ (59%) and Al₂O₃ (50%). The calculated apparent rate constants increasing in the order: Al₂O₃ (2.7×10^-3 min^-1)<CoO/Al₂O₃ (3.9×10^-3 min^-1)<CuO/Al₂O₃ (4.1×10^-3 min^-1)<NiO/Al₂O₃ (8.4×10^-3 min^-1).

This work is a continuation of the HUPER development, as in this study hydrophilization was performed by different types of cement (grey cement and medical cement). It was established that alkaline hydroxides in the cement “milk” composition traditionally perform the preselected role of a hydrophilizer. Water was used as a second dispersing component, which can not only homogenize the composition of the prepared composite material. A third component was introduced (water glass), which was studied due to its dispersing role towards the resin/cement/water system. Mechanical strength characteristics (mostly impact characteristics) characterizing the shape, dimensions and integrity of the operational product were studied based on the obtained composition in various proportions of components.

Polymers are used in every walk of life now-a-days. They are not even hundred years old but playing significant role in every sector of life such as sports, defense, medical, automobile, electrical, agricultural etc. In the beginning, polymers were considered as excellent insulators but conductive polymers are available now. Polymers have good water resistance but some polymers are good absorber of water. The present article deals with monitoring the changes in the mechanical properties of composites with polymer matrix. The composite was formed from the PA matrix and glass fibers. The mechanical properties, impact strength (Charpy) and micro-hardness (Vickers) were evaluated on samples of the composite before and after UV radiation on the sample.