Multifunctional Composites in the B4C-ZrB2-TiB2 System for Armor Plates, Turbine Blades and Blades, High-Temperature and Wear-Resistant for Nodes

Resume: Goal -. The task was to study the phase composition of received consolidated materials in the TiC-TiB2-ZrB2 system. The powders were pressed by hot pressing method in a vacuum 10-3Pa at 21500C - 22000C temperature and 20 - 25 MPa pressure, pressing duration at final temperature was 5 - 8 min. Experimental works have been conducted the objective of which was to improve mechanical properties of boron carbide by introduction of doping elements into the system. Titanium and Zirconium were selected as doping elements, which were introduced into the system in the form of TiB2 and ZrB2. Four types of boron carbide-titanium and zirconium mixtures with various titanium and zirconium diboride content were used in experiments. Optimal process parameters, as well as doping elements concentration, necessary to provide the required high mechanical parameters in the composite were defined.

Methods: To study the phase composition of the composites, an X-ray structural analysis was conducted on the DRON-3 device. To study the microstructure, research was conducted on an optical microscope -AC100 and a raster electron microscope “Nanolab 7” of the company "OPTON”.

Results: In the B4C-TiB2 and B4C-ZrB2 systems, nanocomposites with high mechanical properties were obtained. The advantage of this method is that compounds, which are newly formed thanks to interaction going on at thermal treatment: TiB2 and ZrB2 are active, which contributes to B4C-TiB2 and B4C-ZrB2 formation at temperature, 21500C. It is evident that inculcation of TiB2 in the crystal skeleton of B4C is easier since at this temperature interval crystal skeleton of B4C-TiB2 and B4C-ZrB2 is still in the process of formation.

Conclusion: The phase composition of the obtained composite provides high physical-technical and performance properties of these composites. Compression strength-2182 MPa, Bending strength-298 MPa, Thermal expansion coefficient a20-700-3.6 10-6 0C.